gulmirecin A

naturalproductmech:mibig-930874fc4d MINTED SEEDED

Grounding review: No 3-star ChEBI entry shares this structure, so the record keeps a content-hashed identifier.

What these status tags mean

Curation status describes a workflow state. SEEDED means the record entered through the source-seeding workflow; it does not imply that no later curation occurred. PROPOSED marks an addition awaiting review; REVIEWED records curator sign-off on identity, structure, filing class and producer claims; DEPRECATED retains a superseded or out-of-scope record. These are workflow decisions, not independently verified human review. Agent-assisted contributions may appear in the record history.

Grounding describes the identifier mapping: EXACT uses an ontology identity asserted by the source; MINTED keeps a local identifier when no defensible ontology identity is available; REVIEW_NEEDED flags an exact structure whose ontology identity needs adjudication. The grounding note retains any unresolved alternatives. These tags do not establish the strength of producer or activity evidence.

Structure

Standard InChIKey	BJWRCLLKJSLIRN-UHFFFAOYSA-N
SMILES	CC=C(C)C1CC=C(C)C(OC2OC(CO)C(O)C2O)C(OC(=O)CC(C)C)C(=O)CC(O)C(C)C(=O)O1
Stereochemistry	undefined stereocentres — the InChIKey does not distinguish this compound from its stereoisomers
Cross-references	npatlas:NPA0955

Filing pathway

Polyketides — computed by NPClassifier npclassifier.gnps2.org@2026-09-07, which is why it is pinned rather than recomputed. The gene cluster's asserted class is pks, from MIBiG.

Producer organisms 1

A claim that this taxon makes the compound. The basis says what the evidence addressed — a knockout and a database assertion are not the same claim.

Taxon	Basis	Cluster	Evidence
Pyxidicoccus fallax NCBITaxon:394095	SOURCE_ASSERTION	mibig:BGC0000072	PMID:25287056

Occurrences 1

Somebody found the compound in this organism and cited it. That is not a claim that the organism makes it, and nothing here promotes one to the other.

Taxon	Source	Reference
Pyxidicoccus fallax NCBITaxon:394095	LOTUS	DOI:10.1002/CHEM.201404291

Biosynthetic gene clusters 1

Accession	Host	Locus evidence	Genome
mibig:BGC0000072	Pyxidicoccus fallax NCBITaxon:394095	CLUSTER_UNSTATED	genbank:KM361622.1

A locus claim and a taxon claim are different questions. Heterologous expression settles the first and leaves the second where the isolation report left it.

Mechanism & Biosynthesis Overview

Causal graph — biosynthesis 2 nodes, 1 edge

Native-reference identity in the Pyxidicoccus fallax DSM 28991/BGC0000072 context. A deposited CDS and matching protein sequences do not establish measured expression, an experimental construct, enzyme activity or heme occupancy. No independent equivalence with the paper's HKI 727 strain designation is asserted.

Subject	Predicate	Object	Notes	Evidence
gulG CDS (KM361622.1, reverse strand)	encodes the native protein reference	GulG (DSM 28991 native-reference example)	P. fallax DSM 28991, taxon 394095; complement(63..1247), 1185-nt complete CDS including stop, 394 residues.	https://www.ncbi.nlm.nih.gov/nuccore/KM361622.1 https://www.ncbi.nlm.nih.gov/protein/AIT55258.1 https://www.uniprot.org/uniprotkb/A0A097I351/entry reference https://www.ncbi.nlm.nih.gov/nuccore/KM361622.1 evidence type DATABASE_ASSERTION notes GenBank assigns gulG and AIT55258.1 to this complete reverse-strand CDS with translation table 11. retrieved on 2026-10-08 snippet /gene="gulG" reference https://www.ncbi.nlm.nih.gov/protein/AIT55258.1 evidence type DATABASE_ASSERTION notes The separate GenPept record identifies GulG in DSM 28991 and maps it to the same KM361622.1 CDS. retrieved on 2026-10-08 reference https://www.uniprot.org/uniprotkb/A0A097I351/entry evidence type CURATOR_INFERENCE notes Unreviewed entry version 25, sequence version 1. CDS-aware translation, deposited translation, AIT55258.1 and A0A097I351 match over all 394 residues. This proves native-reference mapping only. UniProt has no specific FUNCTION or CATALYTIC ACTIVITY comment; family, heme and monooxygenase annotations are computational. retrieved on 2026-10-08

Every edge carries its own citation; an uncited edge is refused by the corpus tests.

Causal graph — biosynthesis 4 nodes, 3 edges

Partial proposed biosynthesis graph from active MITE0000303 version 1. MITE infers GulG-dependent hydroxylation from genomic data and chemical structure, not a demonstrated enzyme assay. Its product is an aglycon intermediate, not the fully decorated gulmirecin A owner. No subsequent glycosylation/acylation route or ordered biosynthetic_pathway is asserted. The intermediate and process identifiers remain ungrounded; product double-bond configurations are unspecified and are not completed from the substrate. Only the 2014 paper abstract was inspected; it does not name GulG, and supplement access returned 403. No primary experimental GulG claim is adopted.

Subject	Predicate	Object	Notes	Evidence
GulG (DSM 28991 native-reference example)	is proposed to catalyze	Proposed GulG-dependent alpha-hydroxylation	A sequence-homology candidate, not experimentally demonstrated GulG catalysis or an EryK protein substitution.	https://github.com/mite-standard/mite_data/blob/6eacd913b2036376031072f69cbb33908f132998/mite_data/data/MITE0000303.json reference https://github.com/mite-standard/mite_data/blob/6eacd913b2036376031072f69cbb33908f132998/mite_data/data/MITE0000303.json evidence type DATABASE_ASSERTION notes MITE0000303 version 1 links A0A097I351/AIT55258.1 to BGC0000072 and explicitly bases the candidate assignment on homology to macrolide carbon hydroxylases. It cites DOI:10.1002/chem.201404291, whose full text and supplement were not inspected. The database claim remains an inference. retrieved on 2026-10-08 snippet GulG is a likely candidate for the hydroxylation in alpha position to the keto group
Unhydroxylated precursor (MITE model)	is the modeled substrate of	Proposed GulG-dependent alpha-hydroxylation	Modeled precursor only, not the final gulmirecin A owner and not an independently verified assay substrate.	https://github.com/mite-standard/mite_data/blob/6eacd913b2036376031072f69cbb33908f132998/mite_data/data/MITE0000303.json reference https://github.com/mite-standard/mite_data/blob/6eacd913b2036376031072f69cbb33908f132998/mite_data/data/MITE0000303.json evidence type DATABASE_ASSERTION notes The source evidence code is Inference from genomic data and chemical structure. Pinned RDKit 2026.03.5 gives model substrate key MWECWXVDMOTIGA-MXEPZITCSA-N, with different connectivity from the owner. No external chemical identifier is assigned from the model. retrieved on 2026-10-08
Proposed GulG-dependent alpha-hydroxylation	is proposed to yield	Hydroxylated aglycon intermediate (MITE model)	The product is explicitly marked intermediate by MITE. It is not asserted identical to the owner or a fully stereochemically resolved compound.	https://github.com/mite-standard/mite_data/blob/6eacd913b2036376031072f69cbb33908f132998/mite_data/data/MITE0000303.json reference https://github.com/mite-standard/mite_data/blob/6eacd913b2036376031072f69cbb33908f132998/mite_data/data/MITE0000303.json evidence type DATABASE_ASSERTION notes Pinned RDKit 2026.03.5 gives product key KPWMTEWZWQGQOH-OVJXPFRRSA-N, not owner key BJWRCLLKJSLIRN-UHFFFAOYSA-N. Its specified tetrahedral centers do not resolve two unspecified double bonds; neither configuration is filled. No demonstrated conversion, downstream bridge or ChEBI/Rhea mapping is inferred. retrieved on 2026-10-08

Every edge carries its own citation; an uncited edge is refused by the corpus tests.

Explore across X-Mech

AntibioticMech (gulmirecin A) ↗ MediaIngredientMech (naturalproductmech:mibig-930874fc4d) ↗ TaxonMech: Pyxidicoccus fallax (NCBITaxon:394095) ↗ PathwayMech (mibig:BGC0000072) ↗

Provenance

Source concept	Source	Version
BGC0000072	MIBIG	5

This page is generated from data/natural_products/polyketides/gulmirecin-a.yaml, which is generated from the committed inventories. Neither is edited by hand.