Aspartimidylated omega ester peptide fuscimiditide

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Biosynthesis and characterization of fuscimiditide, an aspartimidylated graspetide.

Elashal, H.E.Koos, J.D.Cheung-Lee, W.L.Choi, B.Cao, L.Richardson, M.A.White, H.L.Link, A.J.

(2022) Nat Chem 14: 1325-1334

  • DOI: https://doi.org/10.1038/s41557-022-01022-y
  • Primary Citation of Related Structures:  
    7LI2, 7LIF

  • PubMed Abstract: 

    Microviridins and other ω-ester-linked peptides, collectively known as graspetides, are characterized by side-chain-side-chain linkages installed by ATP-grasp enzymes. Here we report the discovery of a family of graspetides, the gene clusters of which also encode an O-methyltransferase with homology to the protein repair catalyst protein L-isoaspartyl methyltransferase. Using heterologous expression, we produced fuscimiditide, a ribosomally synthesized and post-translationally modified peptide (RiPP). NMR analysis of fuscimiditide revealed that the peptide contains two ester cross-links forming a stem-loop macrocycle. Furthermore, an unusually stable aspartimide moiety is found within the loop macrocycle. We fully reconstituted fuscimiditide biosynthesis in vitro including formation of the ester and aspartimide moieties. The aspartimide moiety embedded in fuscimiditide hydrolyses regioselectively to isoaspartate. Surprisingly, this isoaspartate-containing peptide is also a substrate for the L-isoaspartyl methyltransferase homologue, thus driving any hydrolysis products back to the aspartimide form. Whereas an aspartimide is often considered a nuisance product in protein formulations, our data suggest that some RiPPs have aspartimide residues intentionally installed via enzymatic activity.

  • Organizational Affiliation

    Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, USA.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fuscimiditide peptide22Thermobifida fusca YXMutation(s): 0 
Gene Names: Tfu_1807
Find proteins for Q47NX9 (Thermobifida fusca (strain YX))
Explore Q47NX9 
Go to UniProtKB:  Q47NX9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ47NX9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM107036

Revision History  (Full details and data files)

  • Version 1.0: 2022-02-09
    Type: Initial release
  • Version 1.1: 2022-08-31
    Changes: Database references
  • Version 1.2: 2022-11-16
    Changes: Database references
  • Version 1.3: 2023-06-14
    Changes: Other