7SAG image
Deposition Date 2021-09-22
Release Date 2022-01-12
Last Version Date 2024-10-23
Entry Detail
PDB ID:
7SAG
Keywords:
Title:
Solution NMR structure of barrettide C
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Conformers Calculated:
50
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Barrettide C
Chain IDs:A
Chain Length:31
Number of Molecules:1
Biological Source:Geodia barretti
Ligand Molecules
Primary Citation
Barrettides: A Peptide Family Specifically Produced by the Deep-Sea Sponge Geodia barretti .
J.Nat.Prod. 84 3138 3146 (2021)
PMID: 34874154 DOI: 10.1021/acs.jnatprod.1c00938

Abstact

Natural product discovery by isolation and structure elucidation is a laborious task often requiring ample quantities of biological starting material and frequently resulting in the rediscovery of previously known compounds. However, peptides are a compound class amenable to an alternative genomic, transcriptomic, and in silico discovery route by similarity searches of known peptide sequences against sequencing data. Based on the sequences of barrettides A and B, we identified five new barrettide sequences (barrettides C-G) predicted from the North Atlantic deep-sea demosponge Geodia barretti (Geodiidae). We synthesized, folded, and investigated one of the newly described barrettides, barrettide C (NVVPCFCVEDETSGAKTCIPDNCDASRGTNP, disulfide connectivity I-IV, II-III). Co-elution experiments of synthetic and sponge-derived barrettide C confirmed its native conformation. NMR spectroscopy and the anti-biofouling activity on larval settlement of the bay barnacle Amphibalanus improvisus (IC50 0.64 μM) show that barrettide C is highly similar to barrettides A and B in both structure and function. Several lines of evidence suggest that barrettides are produced by the sponge itself and not one of its microbial symbionts.

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