Component

Pectic rhamnogalacturonan II / RG-II

Pectic rhamnogalacturonan II / RG-II. Species, exposure and limitations are retained in each linked claim.

4 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

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.

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.

Recorded relationships

Where it participates (unsigned role)

  1. A borate ester bridges two RG-II molecules in the isolated plant-wall dimer.

    Tetrahydroxyborate / B(OH)4− → Borate-diester-linked RG-II dimer source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/pectin-research/8798473.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "4435a2ce2789d98a56c321a69ee20acbcafbff021acf2543a0b9126ebaa375fe", "start_char": 0, "end_char": 1643, "text_sha256": "4435a2ce2789d98a56c321a69ee20acbcafbff021acf2543a0b9126ebaa375fe"}
    experimental_model
    Plant cell-wall isolation and in-vitro dimer chemistry
    exposure
    Isolated RG-II, boric acid and controlled pH
    limitations
    Plant structural chemistry is not a human pectin or boron supplementation mechanism.
    nutrient_topic
    Pectin research collection; topical membership is not evidence of a direct dietary effect. · Pectin, structurally heterogeneous plant polysaccharides
    organism
    Sycamore cell cultures and pea stems; purified plant polysaccharide
    plain_language
    Boron is part of a plant pectin cross-link.
    primary_references
    [pectin-p8798473] Rhamnogalacturonan-II, a pectic polysaccharide in the walls of growing plant cell, forms a dimer that is covalently cross-linked by a borate ester. In vitro conditions for the formation and hydrolysis of the dimer. (1996). https://pubmed.ncbi.nlm.nih.gov/8798473/ DOI: 10.1074/jbc.271.37.22923
    tissue_or_cell_type
    Plant cell wall

    Pectin: metabolism, signaling and nutrient connections (2026-09-17) · lines 334–345

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Plant cell-wall isolation and in-vitro dimer chemistry · source_derived_draft · unverified_draft

    ### pectin-borate-crosslink A borate ester bridges two RG-II molecules in the isolated plant-wall dimer. Condition category: normal nutrient_topic: Pectin research collection; topical membership is not evidence of a direct dietary effect. plain_language: Boron is part of a plant pectin cross-link. organism: Sycamore cell cultures and pea stems; purified plant polysaccharide tissue_or_cell_type: Plant cell wall experimental_model: Plant cell-wall isolation and in-vitro dimer chemistry limitations: Plant structural chemistry is not a human pectin or boron supplementation mechanism. exposure: Isolated RG-II, boric acid and controlled pH evidence_span: {"source_cache": "artifacts/pectin-research/8798473.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "4435a2ce2789d98a56c321a69ee20acbcafbff021acf2543a0b9126ebaa375fe", "start_char": 0, "end_char": 1643, "text_sha256": "4435a2ce2789d98a56c321a69ee20acbcafbff021acf2543a0b9126ebaa375fe"} [pectin-p8798473] Rhamnogalacturonan-II, a pectic polysaccharide in the walls of growing plant cell, forms a dimer that is covalently cross-linked by a borate ester. In vitro conditions for the formation and hydrolysis of the dimer. (1996). https://pubmed.ncbi.nlm.nih.gov/8798473/ DOI: 10.1074/jbc.271.37.22923
    Complete structured claim and evidence

  2. BT0996 contains a beta-D-glucuronidase module targeting RG-II chain A.

    Bacteroides thetaiotaomicron BT0996, dual RG-II glycosidase → B. thetaiotaomicron RG-II chain-A glucuronide cleavage source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/pectin-research/28329766.fulltext.txt", "locator": "Primary full-text span; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e0298d5bf6cef49e211cd0230c691566f2a68a0b7c6642040c50687ac8dcd55f", "start_char": 3702, "end_char": 4301, "text_sha256": "b0577db49fd5f5b6c8a42a003ad49148b31012228ed996430885de1d4fbd6fe0"}
    experimental_model
    Recombinant enzyme dissection and structures
    exposure
    Purified plant RG-II and defined enzymatic substrates
    limitations
    The linked corrigendum DOI 10.1038/nature23659 corrects attribution of glycan symbols to SNFG; it does not reverse these enzyme results. This is microbial biochemistry.
    nutrient_topic
    Pectin research collection; topical membership is not evidence of a direct dietary effect. · Pectin, structurally heterogeneous plant polysaccharides
    organism
    Bacteroides thetaiotaomicron
    plain_language
    A two-part bacterial protein removes one decoration from complex RG-II.
    primary_references
    [pectin-p28329766] Complex pectin metabolism by gut bacteria reveals novel catalytic functions. (2017). https://pubmed.ncbi.nlm.nih.gov/28329766/ DOI: 10.1038/nature21725
    tissue_or_cell_type
    RG-II degradation system

    Pectin: metabolism, signaling and nutrient connections (2026-09-17) · lines 295–306

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recombinant enzyme dissection and structures · source_derived_draft · unverified_draft

    ### pectin-rgii-a BT0996 contains a beta-D-glucuronidase module targeting RG-II chain A. Condition category: normal nutrient_topic: Pectin research collection; topical membership is not evidence of a direct dietary effect. plain_language: A two-part bacterial protein removes one decoration from complex RG-II. organism: Bacteroides thetaiotaomicron tissue_or_cell_type: RG-II degradation system experimental_model: Recombinant enzyme dissection and structures limitations: The linked corrigendum DOI 10.1038/nature23659 corrects attribution of glycan symbols to SNFG; it does not reverse these enzyme results. This is microbial biochemistry. exposure: Purified plant RG-II and defined enzymatic substrates evidence_span: {"source_cache": "artifacts/pectin-research/28329766.fulltext.txt", "locator": "Primary full-text span; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e0298d5bf6cef49e211cd0230c691566f2a68a0b7c6642040c50687ac8dcd55f", "start_char": 3702, "end_char": 4301, "text_sha256": "b0577db49fd5f5b6c8a42a003ad49148b31012228ed996430885de1d4fbd6fe0"} [pectin-p28329766] Complex pectin metabolism by gut bacteria reveals novel catalytic functions. (2017). https://pubmed.ncbi.nlm.nih.gov/28329766/ DOI: 10.1038/nature21725
    Complete structured claim and evidence

  3. A separate beta-L-arabinofuranosidase module in BT0996 targets RG-II chain B.

    Bacteroides thetaiotaomicron BT0996, dual RG-II glycosidase → B. thetaiotaomicron RG-II chain-B arabinofuranoside cleavage source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/pectin-research/28329766.fulltext.txt", "locator": "Primary full-text span; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e0298d5bf6cef49e211cd0230c691566f2a68a0b7c6642040c50687ac8dcd55f", "start_char": 3702, "end_char": 4301, "text_sha256": "b0577db49fd5f5b6c8a42a003ad49148b31012228ed996430885de1d4fbd6fe0"}
    experimental_model
    Recombinant enzyme dissection and structures
    exposure
    Purified plant RG-II and defined enzymatic substrates
    limitations
    The linked corrigendum DOI 10.1038/nature23659 corrects attribution of glycan symbols to SNFG; it does not reverse these enzyme results. This is microbial biochemistry.
    nutrient_topic
    Pectin research collection; topical membership is not evidence of a direct dietary effect. · Pectin, structurally heterogeneous plant polysaccharides
    organism
    Bacteroides thetaiotaomicron
    plain_language
    The other part of the same protein performs a different cut.
    primary_references
    [pectin-p28329766] Complex pectin metabolism by gut bacteria reveals novel catalytic functions. (2017). https://pubmed.ncbi.nlm.nih.gov/28329766/ DOI: 10.1038/nature21725
    tissue_or_cell_type
    RG-II degradation system

    Pectin: metabolism, signaling and nutrient connections (2026-09-17) · lines 308–319

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recombinant enzyme dissection and structures · source_derived_draft · unverified_draft

    ### pectin-rgii-b A separate beta-L-arabinofuranosidase module in BT0996 targets RG-II chain B. Condition category: normal nutrient_topic: Pectin research collection; topical membership is not evidence of a direct dietary effect. plain_language: The other part of the same protein performs a different cut. organism: Bacteroides thetaiotaomicron tissue_or_cell_type: RG-II degradation system experimental_model: Recombinant enzyme dissection and structures limitations: The linked corrigendum DOI 10.1038/nature23659 corrects attribution of glycan symbols to SNFG; it does not reverse these enzyme results. This is microbial biochemistry. exposure: Purified plant RG-II and defined enzymatic substrates evidence_span: {"source_cache": "artifacts/pectin-research/28329766.fulltext.txt", "locator": "Primary full-text span; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e0298d5bf6cef49e211cd0230c691566f2a68a0b7c6642040c50687ac8dcd55f", "start_char": 3702, "end_char": 4301, "text_sha256": "b0577db49fd5f5b6c8a42a003ad49148b31012228ed996430885de1d4fbd6fe0"} [pectin-p28329766] Complex pectin metabolism by gut bacteria reveals novel catalytic functions. (2017). https://pubmed.ncbi.nlm.nih.gov/28329766/ DOI: 10.1038/nature21725
    Complete structured claim and evidence

  4. BT1020 combines an N-terminal Dha hydrolase with a C-terminal beta-L-arabinofuranosidase for chain-D processing.

    Bacteroides thetaiotaomicron BT1020, dual RG-II chain-D hydrolase → B. thetaiotaomicron RG-II chain-D hydrolysis source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/pectin-research/28329766.fulltext.txt", "locator": "Primary full-text span; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e0298d5bf6cef49e211cd0230c691566f2a68a0b7c6642040c50687ac8dcd55f", "start_char": 3702, "end_char": 4301, "text_sha256": "b0577db49fd5f5b6c8a42a003ad49148b31012228ed996430885de1d4fbd6fe0"}
    experimental_model
    Recombinant enzyme dissection and structures
    exposure
    Purified plant RG-II and defined enzymatic substrates
    limitations
    The linked corrigendum DOI 10.1038/nature23659 corrects attribution of glycan symbols to SNFG; it does not reverse these enzyme results. This is microbial biochemistry.
    nutrient_topic
    Pectin research collection; topical membership is not evidence of a direct dietary effect. · Pectin, structurally heterogeneous plant polysaccharides
    organism
    Bacteroides thetaiotaomicron
    plain_language
    Complex pectin requires coordinated, chemically distinct cuts.
    primary_references
    [pectin-p28329766] Complex pectin metabolism by gut bacteria reveals novel catalytic functions. (2017). https://pubmed.ncbi.nlm.nih.gov/28329766/ DOI: 10.1038/nature21725
    tissue_or_cell_type
    RG-II degradation system

    Pectin: metabolism, signaling and nutrient connections (2026-09-17) · lines 321–332

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recombinant enzyme dissection and structures · source_derived_draft · unverified_draft

    ### pectin-rgii-d BT1020 combines an N-terminal Dha hydrolase with a C-terminal beta-L-arabinofuranosidase for chain-D processing. Condition category: normal nutrient_topic: Pectin research collection; topical membership is not evidence of a direct dietary effect. plain_language: Complex pectin requires coordinated, chemically distinct cuts. organism: Bacteroides thetaiotaomicron tissue_or_cell_type: RG-II degradation system experimental_model: Recombinant enzyme dissection and structures limitations: The linked corrigendum DOI 10.1038/nature23659 corrects attribution of glycan symbols to SNFG; it does not reverse these enzyme results. This is microbial biochemistry. exposure: Purified plant RG-II and defined enzymatic substrates evidence_span: {"source_cache": "artifacts/pectin-research/28329766.fulltext.txt", "locator": "Primary full-text span; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e0298d5bf6cef49e211cd0230c691566f2a68a0b7c6642040c50687ac8dcd55f", "start_char": 3702, "end_char": 4301, "text_sha256": "b0577db49fd5f5b6c8a42a003ad49148b31012228ed996430885de1d4fbd6fe0"} [pectin-p28329766] Complex pectin metabolism by gut bacteria reveals novel catalytic functions. (2017). https://pubmed.ncbi.nlm.nih.gov/28329766/ DOI: 10.1038/nature21725
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

    Evidence, AI assistance and curation standards