8V2U | pdb_00008v2u

Structure of Asterias rubens peptide KASH2-amide

• PDB DOI: https://doi.org/10.2210/pdb8V2U/pdb
• BMRB: 31129

• Classification: UNKNOWN FUNCTION
• Organism(s): Asterias rubens
• Mutation(s): Yes 


• Deposited: 2023-11-23 Released: 2024-11-27 
• Deposition Author(s): Takjoo, R., Le Quilliec, J., Daly, N.L.
• Funding Organization(s): Not funded

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 20 
• Selection Criteria: target function 

Literature

Structural analysis of an Asterias rubens peptide indicates the presence of a disulfide-directed beta-hairpin fold.

Takjoo, R., Wilson, D.T., Le Quilliec, J., Schmidt, C.A., Zhao, G., Liddell, M.J., Shaikh, N.Y., Sunagar, K., Loukas, A., Smout, M.J., Daly, N.L.

(2025) FEBS Open Bio 15: 415-426

• PubMed: 39561265 
• DOI: https://doi.org/10.1002/2211-5463.13931
• Primary Citation Related Structures: 
  8V2M, 8V2U


• PubMed Abstract: 
  

  Sea stars are an abundant group of marine invertebrates that display remarkably robust regenerative capabilities throughout all life stages. Numerous proteins and peptides have been identified in a proteome study on the coelomic fluid (biofluid) of the common sea star Asterias rubens, which appear to be involved with the wound-healing response in the organism. However, the three-dimensional structure and function of several of these injury-responsive peptides, including the peptide KASH2, are yet to be investigated. Here, we show that the KASH2 peptide adopts a disulfide-directed β-hairpin fold (DDH). The DDH motif appears to be evolutionarily related to the inhibitor cystine knot motif, which is one of the most widespread disulfide-rich peptide folds. The DDH motif was originally thought to be restricted to arachnids, but our study suggests that as a result of convergent evolution it could also have originated in sea stars. Although the widely conserved DDH fold has potential cross-phyla wound-healing capacity, we have shown that KASH2 does not enhance the proliferation of human fibroblasts, a simple method for wound-healing re-epithelialisation screening. Therefore, additional research is necessary to determine the role of KASH2 in the sea stars.

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Organizational Affiliation: 
• Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Australia.
Univ Brest, École Supérieure d'Ingénieurs en Agroalimentaire de Bretagne atlantique, Plouzané, France.
College of Science and Engineering, James Cook University, Cairns, Australia.
Evolutionary Venomics Lab, Centre for Ecological Sciences, Indian Institute of Science, Bangalore, India.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: NMR Distance Restraints

Macromolecule Content 

• Total Structure Weight: 2.89 kDa 
• Atom Count: 200 
• Modeled Residue Count: 26 
• Deposited Residue Count: 27 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Kartesh 2	A	27	Asterias rubens	Mutation(s): 1

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 20 
• Selection Criteria: target function 

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2024-11-27 
Deposition Author(s): Takjoo, R., Le Quilliec, J., Daly, N.L.

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Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2024-11-27
  Type: Initial release
  
• Version 1.1: 2024-12-04
  Changes: Database references
• Version 1.2: 2025-03-19
  Changes: Database references