Component
Hydrogen ion
H+; proton activity and concentration depend on compartment and buffering.
11 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
How nutrients influence it
Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
How nutrients reach it in more than one step
Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.
Tracing routes…
What it does
Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.
What it acts on
In the egg-yolk/human saliva model, acidification to pH 1.5 permitted limited cobalamin transfer to R binder; virtually none occurred above pH 2 despite pepsin.
Experimental context and source evidence
- cross_nutrient
- false
- experimental_model
- In vitro egg-yolk cobalamin-binding protein mixed with human saliva/gastric juice
- exposure
- In vitro pH manipulation
- limitations
- Food-specific biochemical model; this pH threshold is not a clinical blood threshold or proof that all foods behave identically. Pepsin preparation species was not specified in the inspected abstract.
- nutrient_topic
- Vitamin B12 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin B12 (cobalamins)
- organism
- Homo sapiens
- plain_language
- Acid enabled release and capture of B12 from this food model.
- primary_references
- [carmel-1990-food-transfer] Transfer of cobalamin from the cobalamin-binding protein of egg yolk to R binder of human saliva and gastric juice. (1990). https://pubmed.ncbi.nlm.nih.gov/2110915/ DOI: 10.1016/0016-5085(90)91076-i
- tissue_or_cell_type
- Gastric luminal digestion model
Vitamin B12: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 88–99
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · In vitro egg-yolk cobalamin-binding protein mixed with human saliva/gastric juice · source_derived_draft · unverified_draft
### b12-abs-food-acid In the egg-yolk/human saliva model, acidification to pH 1.5 permitted limited cobalamin transfer to R binder; virtually none occurred above pH 2 despite pepsin. Condition category: normal nutrient_topic: Vitamin B12 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Acid enabled release and capture of B12 from this food model. organism: Homo sapiens tissue_or_cell_type: Gastric luminal digestion model experimental_model: In vitro egg-yolk cobalamin-binding protein mixed with human saliva/gastric juice limitations: Food-specific biochemical model; this pH threshold is not a clinical blood threshold or proof that all foods behave identically. Pepsin preparation species was not specified in the inspected abstract. exposure: In vitro pH manipulation cross_nutrient: false [carmel-1990-food-transfer] Transfer of cobalamin from the cobalamin-binding protein of egg yolk to R binder of human saliva and gastric juice. (1990). https://pubmed.ncbi.nlm.nih.gov/2110915/ DOI: 10.1016/0016-5085(90)91076-i
Complete structured claim and evidenceLowering assay pH from 7.5 to 6.5 increased the reported mARC NO-formation rate by nearly threefold.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/molybdenum-research/24500710.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e4c2ab41c945d420266290d0241752039d7de2cb6223f9c64c7d0525c5688d9b", "start_char": 0, "end_char": 1585, "text_sha256": "e4c2ab41c945d420266290d0241752039d7de2cb6223f9c64c7d0525c5688d9b"}
- experimental_model
- Recombinant human mARC1/mARC2, active-site mutation, tungsten replacement and HEK expression
- exposure
- Reduced enzyme, nitrite, NADH/CYB5/CYB5R; pH 7.5 versus 6.5
- limitations
- Shows nitrite-reducing capacity; its share of NO production in normal people and response to mineral intake are not established.
- nutrient_topic
- Molybdenum research collection; topical membership is not evidence of a direct dietary effect. · Molybdenum
- organism
- Homo sapiens proteins and HEK cells
- plain_language
- Acidity changed the reaction rate in this assay.
- primary_references
- [mo-p24500710] Nitrite reductase and nitric-oxide synthase activity of the mitochondrial molybdopterin enzymes mARC1 and mARC2. (2014). https://pubmed.ncbi.nlm.nih.gov/24500710/ DOI: 10.1074/jbc.m114.555177
- tissue_or_cell_type
- Purified redox system and human cell model
Molybdenum: cofactor assembly, sulfur metabolism and nutrient interactions (2026-09-17) · lines 1054–1065
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recombinant human mARC1/mARC2, active-site mutation, tungsten replacement and HEK expression · source_derived_draft · unverified_draft
### mo-marc-ph Lowering assay pH from 7.5 to 6.5 increased the reported mARC NO-formation rate by nearly threefold. Condition category: normal nutrient_topic: Molybdenum research collection; topical membership is not evidence of a direct dietary effect. plain_language: Acidity changed the reaction rate in this assay. organism: Homo sapiens proteins and HEK cells tissue_or_cell_type: Purified redox system and human cell model experimental_model: Recombinant human mARC1/mARC2, active-site mutation, tungsten replacement and HEK expression limitations: Shows nitrite-reducing capacity; its share of NO production in normal people and response to mineral intake are not established. exposure: Reduced enzyme, nitrite, NADH/CYB5/CYB5R; pH 7.5 versus 6.5 evidence_span: {"source_cache": "artifacts/molybdenum-research/24500710.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e4c2ab41c945d420266290d0241752039d7de2cb6223f9c64c7d0525c5688d9b", "start_char": 0, "end_char": 1585, "text_sha256": "e4c2ab41c945d420266290d0241752039d7de2cb6223f9c64c7d0525c5688d9b"} [mo-p24500710] Nitrite reductase and nitric-oxide synthase activity of the mitochondrial molybdopterin enzymes mARC1 and mARC2. (2014). https://pubmed.ncbi.nlm.nih.gov/24500710/ DOI: 10.1074/jbc.m114.555177
Complete structured claim and evidence
What acts on it
NMR and potentiometric titration measured reversible protonation of carnosine, including its imidazole site near physiological pH.
Experimental context and source evidence
- evidence_access
- Primary full text, methods and protonation results
- experimental_model
- Purified dipeptides at 310.15 K and 0.15 M ionic strength.
- limitations
- Chemical buffering does not establish how much a supplement changes exercising muscle pH.
- nutrient_topic
- Carnosine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnosine / beta-alanyl-L-histidine
- plain_language
- Reversible proton binding gives the molecule buffering capacity.
- primary_references
- Species-specific acid-base characterization of carnosine and homocarnosine using nuclear magnetic resonance · 2022 · https://doi.org/10.1016/j.cplett.2022.140128 · DOI 10.1016/j.cplett.2022.140128
Carnosine: synthesis, transport, carbonyl chemistry and nutrient interactions (2026-09-19) · lines 180–186
AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Purified dipeptides at 310.15 K and 0.15 M ionic strength. · source_derived_draft · unverified_draft
## carnosine-proton-buffer Reversible proton binding gives the molecule buffering capacity. NMR and potentiometric titration measured reversible protonation of carnosine, including its imidazole site near physiological pH. Model: Purified dipeptides at 310.15 K and 0.15 M ionic strength. Limitations: Chemical buffering does not establish how much a supplement changes exercising muscle pH. Evidence access: Primary full text, methods and protonation results Species-specific acid-base characterization of carnosine and homocarnosine using nuclear magnetic resonance · 2022 · https://doi.org/10.1016/j.cplett.2022.140128 · DOI 10.1016/j.cplett.2022.140128
Complete structured claim and evidence
Where it participates (unsigned role)
HCl infusion causing acute mineral acidemia raised plasma potassium in the conscious-dog experiment.
Experimental context and source evidence
- endpoint
- HCl infusion causing acute mineral acidemia raised plasma potassium in the conscious-dog experiment.
- experimental-exposure
- Experimental acute mineral acidemia with hyperkalemia; not potassium deficiency or excessive potassium intake.
- experimental_model
- Twelve conscious dogs with portal/hepatic/systemic sampling; beta-hydroxybutyric acid 7 mEq/kg or HCl 3 mEq/kg infused over 30 minutes; additional anesthetized and obstructed-urinary-tract studies.
- limitations
- Acute HCl infusion, not every acidosis; portal glucagon rose and direct H/K exchange was not isolated.
- nutrient_topic
- Potassium research collection; topical membership is not evidence of a direct dietary effect. · Potassium
- organism
- Canis lupus familiaris
- plain_language
- Acid type affected the potassium response; a rise in blood potassium did not imply excess potassium intake.
- primary_references
- [adrogue-1985-acid-infusion] Role of the endocrine pancreas in the kalemic response to acute metabolic acidosis in conscious dogs (1985). https://www.jci.org/articles/view/111775 DOI: 10.1172/JCI111775
- tissue_or_cell_type
- systemic and splanchnic circulation
Potassium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 1151–1162
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Twelve conscious dogs with portal/hepatic/systemic sampling; beta-hydroxybutyric acid 7 mEq/kg or HCl 3 mEq/kg infused over 30 minutes; additional anesthetized and obstructed-urinary-tract studies. · source_derived_draft · unverified_draft
### hcl-acidemia-raises-plasma-k HCl infusion causing acute mineral acidemia raised plasma potassium in the conscious-dog experiment. Condition category: normal nutrient_topic: Potassium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Acid type affected the potassium response; a rise in blood potassium did not imply excess potassium intake. organism: Canis lupus familiaris tissue_or_cell_type: systemic and splanchnic circulation experimental_model: Twelve conscious dogs with portal/hepatic/systemic sampling; beta-hydroxybutyric acid 7 mEq/kg or HCl 3 mEq/kg infused over 30 minutes; additional anesthetized and obstructed-urinary-tract studies. limitations: Acute HCl infusion, not every acidosis; portal glucagon rose and direct H/K exchange was not isolated. experimental-exposure: Experimental acute mineral acidemia with hyperkalemia; not potassium deficiency or excessive potassium intake. endpoint: HCl infusion causing acute mineral acidemia raised plasma potassium in the conscious-dog experiment. [adrogue-1985-acid-infusion] Role of the endocrine pancreas in the kalemic response to acute metabolic acidosis in conscious dogs (1985). https://www.jci.org/articles/view/111775 DOI: 10.1172/JCI111775
Complete structured claim and evidenceLuminal omeprazole abolished net total-CO2 flux used to measure acidification in collecting ducts from potassium-restricted rabbits.
Experimental context and source evidence
- availability_state
- nutrient_deficiency Imported condition classification; unverified.
- endpoint
- Luminal omeprazole abolished net total-CO2 flux used to measure acidification in collecting ducts from potassium-restricted rabbits.
- experimental-exposure
- Microperfused inner-stripe outer medullary collecting ducts from rabbits fed 0.55% potassium diet for 7-14 days; luminal omeprazole 0.1 mM.
- experimental_model
- Microperfused inner-stripe outer medullary collecting ducts from rabbits fed 0.55% potassium diet for 7-14 days; luminal omeprazole 0.1 mM.
- limitations
- Pharmacological activity assignment; the experiment does not isolate ATP4A versus ATP12A. Total-CO2 flux is an acidification surrogate.
- nutrient_topic
- Potassium research collection; topical membership is not evidence of a direct dietary effect. · Potassium
- organism
- Oryctolagus cuniculus
- plain_language
- An H/K-pump-compatible activity supported acid secretion in the isolated duct.
- primary_references
- [wingo-1989-hka] Active proton secretion and potassium absorption in the rabbit outer medullary collecting duct. Functional evidence for proton-potassium-activated adenosine triphosphatase (1989). https://pubmed.ncbi.nlm.nih.gov/2544629/ DOI: 10.1172/JCI114165
- tissue_or_cell_type
- inner-stripe outer medullary collecting duct
- transport_direction
- potassium: tubular lumen toward blood; protons: cell toward tubular lumen
- trigger_kind
- nutrient_deficiency Imported condition classification; unverified.
Potassium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 1096–1108
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Microperfused inner-stripe outer medullary collecting ducts from rabbits fed 0.55% potassium diet for 7-14 days; luminal omeprazole 0.1 mM. · source_derived_draft · unverified_draft
### hka-sensitive-proton-secretion Luminal omeprazole abolished net total-CO2 flux used to measure acidification in collecting ducts from potassium-restricted rabbits. Condition category: nutrient_deficiency nutrient_topic: Potassium research collection; topical membership is not evidence of a direct dietary effect. plain_language: An H/K-pump-compatible activity supported acid secretion in the isolated duct. organism: Oryctolagus cuniculus tissue_or_cell_type: inner-stripe outer medullary collecting duct experimental_model: Microperfused inner-stripe outer medullary collecting ducts from rabbits fed 0.55% potassium diet for 7-14 days; luminal omeprazole 0.1 mM. limitations: Pharmacological activity assignment; the experiment does not isolate ATP4A versus ATP12A. Total-CO2 flux is an acidification surrogate. transport_direction: potassium: tubular lumen toward blood; protons: cell toward tubular lumen experimental-exposure: Microperfused inner-stripe outer medullary collecting ducts from rabbits fed 0.55% potassium diet for 7-14 days; luminal omeprazole 0.1 mM. endpoint: Luminal omeprazole abolished net total-CO2 flux used to measure acidification in collecting ducts from potassium-restricted rabbits. [wingo-1989-hka] Active proton secretion and potassium absorption in the rabbit outer medullary collecting duct. Functional evidence for proton-potassium-activated adenosine triphosphatase (1989). https://pubmed.ncbi.nlm.nih.gov/2544629/ DOI: 10.1172/JCI114165
Complete structured claim and evidenceAdding pepsin at 1,200 U/mL under acidic conditions increased egg-yolk cobalamin transfer to human salivary or gastric R binders to 39-58%.
Experimental context and source evidence
- cross_nutrient
- false
- experimental_model
- In vitro egg-yolk cobalamin-binding protein mixed with human saliva/gastric juice
- exposure
- Pepsin supplementation at acidic pH
- limitations
- Food-specific biochemical model; this pH threshold is not a clinical blood threshold or proof that all foods behave identically. Pepsin preparation species was not specified in the inspected abstract.
- nutrient_topic
- Vitamin B12 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin B12 (cobalamins)
- organism
- Homo sapiens
- plain_language
- Pepsin helped haptocorrin capture food-bound B12.
- primary_references
- [carmel-1990-food-transfer] Transfer of cobalamin from the cobalamin-binding protein of egg yolk to R binder of human saliva and gastric juice. (1990). https://pubmed.ncbi.nlm.nih.gov/2110915/ DOI: 10.1016/0016-5085(90)91076-i
- tissue_or_cell_type
- Gastric luminal digestion model
Vitamin B12: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 101–112
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · In vitro egg-yolk cobalamin-binding protein mixed with human saliva/gastric juice · source_derived_draft · unverified_draft
### b12-abs-food-pepsin Adding pepsin at 1,200 U/mL under acidic conditions increased egg-yolk cobalamin transfer to human salivary or gastric R binders to 39-58%. Condition category: normal nutrient_topic: Vitamin B12 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Pepsin helped haptocorrin capture food-bound B12. organism: Homo sapiens tissue_or_cell_type: Gastric luminal digestion model experimental_model: In vitro egg-yolk cobalamin-binding protein mixed with human saliva/gastric juice limitations: Food-specific biochemical model; this pH threshold is not a clinical blood threshold or proof that all foods behave identically. Pepsin preparation species was not specified in the inspected abstract. exposure: Pepsin supplementation at acidic pH cross_nutrient: false [carmel-1990-food-transfer] Transfer of cobalamin from the cobalamin-binding protein of egg yolk to R binder of human saliva and gastric juice. (1990). https://pubmed.ncbi.nlm.nih.gov/2110915/ DOI: 10.1016/0016-5085(90)91076-i
Complete structured claim and evidenceStructural analysis of mammalian NNT supported coupling of NADH-to-NADP+ hydride transfer to proton translocation across the mitochondrial membrane.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/niacin-redox-sources/nnt-structure-2019.abstract.txt", "locator": "Indexed abstract, reaction and structural mechanism", "start_char": 199, "end_char": 1759, "file_sha256": "edb35c2cdf2f57d604cb86da48665e5742d398f43c50f3e1622d161564c78a83", "text_sha256": "aa5063e57c35097c2fa2557ed9a7d61c3a411d90d0ded9b947525012520a5712"}
- experimental_model
- Cryo-EM of intact ovine NNT in different nucleotide states
- exposure
- Nucleotide-bound conformational states
- limitations
- Structural mechanism supported in ovine protein; forward flux is context dependent and not equivalent to adding phosphate to NAD. No human intake inference.
- nutrient_topic
- Niacin research collection; topical membership is not evidence of a direct dietary effect. · Niacin (vitamin B3)
- organism
- Ovis aries
- plain_language
- NNT links the NADH and NADPH redox systems through membrane-coupled chemistry.
- primary_references
- [nnt-structure-2019] Structure and mechanism of mitochondrial proton-translocating transhydrogenase. (2019). https://pubmed.ncbi.nlm.nih.gov/31462775/ DOI: 10.1038/s41586-019-1519-2
- tissue_or_cell_type
- Purified mitochondrial protein
Niacin: NAD metabolism, deficiency and nutrient interactions (2026-09-17) · lines 1003–1014
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Cryo-EM of intact ovine NNT in different nucleotide states · source_derived_draft · unverified_draft
### b3-redox-nnt-coupling Structural analysis of mammalian NNT supported coupling of NADH-to-NADP+ hydride transfer to proton translocation across the mitochondrial membrane. Condition category: normal nutrient_topic: Niacin research collection; topical membership is not evidence of a direct dietary effect. plain_language: NNT links the NADH and NADPH redox systems through membrane-coupled chemistry. organism: Ovis aries tissue_or_cell_type: Purified mitochondrial protein experimental_model: Cryo-EM of intact ovine NNT in different nucleotide states limitations: Structural mechanism supported in ovine protein; forward flux is context dependent and not equivalent to adding phosphate to NAD. No human intake inference. exposure: Nucleotide-bound conformational states evidence_span: {"source_cache": "artifacts/niacin-redox-sources/nnt-structure-2019.abstract.txt", "locator": "Indexed abstract, reaction and structural mechanism", "start_char": 199, "end_char": 1759, "file_sha256": "edb35c2cdf2f57d604cb86da48665e5742d398f43c50f3e1622d161564c78a83", "text_sha256": "aa5063e57c35097c2fa2557ed9a7d61c3a411d90d0ded9b947525012520a5712"} [nnt-structure-2019] Structure and mechanism of mitochondrial proton-translocating transhydrogenase. (2019). https://pubmed.ncbi.nlm.nih.gov/31462775/ DOI: 10.1038/s41586-019-1519-2
Complete structured claim and evidenceHuman CNDP2 hydrolyzed carnosine only under alkaline assay conditions, with an optimum near pH 9.5.
Experimental context and source evidence
- evidence_access
- Primary abstract
- experimental_model
- Purified recombinant protein.
- limitations
- Do not assume CNDP2 is an equally active carnosinase at normal cytosolic pH.
- nutrient_topic
- Carnosine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnosine / beta-alanyl-L-histidine
- plain_language
- The similarly named enzyme behaved differently.
- primary_references
- Sequence identification and characterization of human carnosinase and a closely related non-specific dipeptidase. · 2003 · https://pubmed.ncbi.nlm.nih.gov/12473676/ · DOI 10.1074/jbc.M209764200
Carnosine: synthesis, transport, carbonyl chemistry and nutrient interactions (2026-09-19) · lines 52–58
AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Purified recombinant protein. · source_derived_draft · unverified_draft
## carnosine-cndp2-ph The similarly named enzyme behaved differently. Human CNDP2 hydrolyzed carnosine only under alkaline assay conditions, with an optimum near pH 9.5. Model: Purified recombinant protein. Limitations: Do not assume CNDP2 is an equally active carnosinase at normal cytosolic pH. Evidence access: Primary abstract Sequence identification and characterization of human carnosinase and a closely related non-specific dipeptidase. · 2003 · https://pubmed.ncbi.nlm.nih.gov/12473676/ · DOI 10.1074/jbc.M209764200
Complete structured claim and evidenceCarnosine reacted with HNE to form a stabilized Michael adduct and an imine macrocycle in a pH-dependent equilibrium.
Experimental context and source evidence
- evidence_access
- Primary abstract
- experimental_model
- Buffered chemical reactions; adducts also detected in oxidized rat muscle homogenate.
- limitations
- Reaction chemistry does not measure clinical protection.
- nutrient_topic
- Carnosine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnosine / beta-alanyl-L-histidine
- plain_language
- The peptide can chemically trap a lipid-derived aldehyde.
- primary_references
- Carnosine is a quencher of 4-hydroxy-nonenal: through what mechanism of reaction? · 2002 · https://pubmed.ncbi.nlm.nih.gov/12419310/ · DOI 10.1016/s0006-291x(02)02545-7
Carnosine: synthesis, transport, carbonyl chemistry and nutrient interactions (2026-09-19) · lines 236–242
AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Buffered chemical reactions; adducts also detected in oxidized rat muscle homogenate. · source_derived_draft · unverified_draft
## carnosine-hne-adduction The peptide can chemically trap a lipid-derived aldehyde. Carnosine reacted with HNE to form a stabilized Michael adduct and an imine macrocycle in a pH-dependent equilibrium. Model: Buffered chemical reactions; adducts also detected in oxidized rat muscle homogenate. Limitations: Reaction chemistry does not measure clinical protection. Evidence access: Primary abstract Carnosine is a quencher of 4-hydroxy-nonenal: through what mechanism of reaction? · 2002 · https://pubmed.ncbi.nlm.nih.gov/12419310/ · DOI 10.1016/s0006-291x(02)02545-7
Complete structured claim and evidenceApplying carnosine to oocytes expressing human PEPT1 produced electrogenic proton-coupled transport currents.
Experimental context and source evidence
- evidence_access
- Primary abstract
- experimental_model
- Human transporter expressed in Xenopus oocytes.
- limitations
- Transporter expression system, not whole-body bioavailability.
- nutrient_topic
- Carnosine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnosine / beta-alanyl-L-histidine
- plain_language
- A peptide transporter can carry intact carnosine.
- primary_references
- The bioactive dipeptide anserine is transported by human proton-coupled peptide transporters. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20067523/ · DOI 10.1111/j.1742-4658.2009.07528.x
- transport_effect
- raises Applying carnosine produced electrogenic proton-coupled inward transport currents.
- transport_pool
- the expressing cell Applying carnosine produced electrogenic proton-coupled inward transport currents.
Carnosine: synthesis, transport, carbonyl chemistry and nutrient interactions (2026-09-19) · lines 68–74
AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Human transporter expressed in Xenopus oocytes. · source_derived_draft · unverified_draft
## carnosine-pept1 A peptide transporter can carry intact carnosine. Applying carnosine to oocytes expressing human PEPT1 produced electrogenic proton-coupled transport currents. Model: Human transporter expressed in Xenopus oocytes. Limitations: Transporter expression system, not whole-body bioavailability. Evidence access: Primary abstract The bioactive dipeptide anserine is transported by human proton-coupled peptide transporters. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20067523/ · DOI 10.1111/j.1742-4658.2009.07528.x
Complete structured claim and evidenceHMIT expressed in Xenopus oocytes mediated electrogenic proton-coupled myo-inositol uptake that increased as pH fell, with maximal tested activity near pH 5.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/inositol-research/11500374.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "fb9efd53bbc0fae1bf1ada1525cdb7d10a4e700d3309bfba4e3a598c4a9c74b9", "start_char": 0, "end_char": 1270, "text_sha256": "fb9efd53bbc0fae1bf1ada1525cdb7d10a4e700d3309bfba4e3a598c4a9c74b9"}
- experimental_model
- Transporter expression and electrophysiology
- exposure
- Extracellular pH manipulation
- limitations
- Transport capacity after heterologous expression does not establish a neuronal plasma-membrane role in vivo.
- nutrient_topic
- Inositol research collection; topical membership is not evidence of a direct dietary effect. · Inositol (stereoisomer family)
- organism
- Rat brain transporter studied in Xenopus oocytes
- plain_language
- A different transporter can use a proton gradient, particularly in acidic experimental conditions.
- primary_references
- [ino-p11500374] Identification of a mammalian H(+)-myo-inositol symporter expressed predominantly in the brain. (2001). https://pubmed.ncbi.nlm.nih.gov/11500374/ DOI: 10.1093/emboj/20.16.4467
- tissue_or_cell_type
- Heterologous membranes and rat brain
- transport_effect
- raises Electrogenic proton-coupled myo-inositol uptake rising as pH fell.
- transport_pool
- the expressing cell Electrogenic proton-coupled myo-inositol uptake rising as pH fell.
Inositol: synthesis, signaling, mineral interactions and conditional deficiency (2026-09-17) · lines 366–377
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Transporter expression and electrophysiology · source_derived_draft · unverified_draft
### ino-hmit-acid HMIT expressed in Xenopus oocytes mediated electrogenic proton-coupled myo-inositol uptake that increased as pH fell, with maximal tested activity near pH 5. Condition category: normal nutrient_topic: Inositol research collection; topical membership is not evidence of a direct dietary effect. plain_language: A different transporter can use a proton gradient, particularly in acidic experimental conditions. organism: Rat brain transporter studied in Xenopus oocytes tissue_or_cell_type: Heterologous membranes and rat brain experimental_model: Transporter expression and electrophysiology limitations: Transport capacity after heterologous expression does not establish a neuronal plasma-membrane role in vivo. exposure: Extracellular pH manipulation evidence_span: {"source_cache": "artifacts/inositol-research/11500374.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "fb9efd53bbc0fae1bf1ada1525cdb7d10a4e700d3309bfba4e3a598c4a9c74b9", "start_char": 0, "end_char": 1270, "text_sha256": "fb9efd53bbc0fae1bf1ada1525cdb7d10a4e700d3309bfba4e3a598c4a9c74b9"} [ino-p11500374] Identification of a mammalian H(+)-myo-inositol symporter expressed predominantly in the brain. (2001). https://pubmed.ncbi.nlm.nih.gov/11500374/ DOI: 10.1093/emboj/20.16.4467
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.