2LLF

Sixth Gelsolin-like domain of villin in 5 mM CaCl2


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 600 
  • Conformers Submitted: 10 
  • Selection Criteria: target function 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Gelsolin-like activation of villin: calcium sensitivity of the long helix in domain 6.

Fedechkin, S.O.Brockerman, J.Pfaff, D.A.Burns, L.Webb, T.Nelson, A.Zhang, F.Sabantsev, A.V.Melnikov, A.S.McKnight, C.J.Smirnov, S.L.

(2013) Biochemistry 52: 7890-7900

  • DOI: 10.1021/bi400699s

  • PubMed Abstract: 
  • Villin is a gelsolin-like cytoskeleton regulator localized in the brush border at the apical end of epithelial cells. Villin regulates microvilli by bundling F-actin at low calcium levels and severing it at high calcium levels. The villin polypeptide ...

    Villin is a gelsolin-like cytoskeleton regulator localized in the brush border at the apical end of epithelial cells. Villin regulates microvilli by bundling F-actin at low calcium levels and severing it at high calcium levels. The villin polypeptide consists of six gelsolin-like repeats (V1-V6) and the unique, actin binding C-terminal headpiece domain (HP). Villin modular fragment V6-HP requires calcium to stay monomeric and bundle F-actin. Our data show that isolated V6 is monomeric and does not bind F-actin at any level of calcium. We propose that the 40-residue unfolded V6-to-HP linker can be a key regulatory element in villin's functions such as its interactions with F-actin. Here we report a calcium-bound solution nuclear magnetic resonance (NMR) structure of V6, which has a gelsolin-like fold with the long α-helix in the extended conformation. Intrinsic tryptophan fluorescence quenching reveals two-Kd calcium binding in V6 (Kd1 of 22 μM and Kd2 of 2.8 mM). According to our NMR data, the conformation of V6 responds the most to micromolar calcium. We show that the long α-helix and the adjacent residues form the calcium-sensitive elements in V6. These observations are consistent with the calcium activation of F-actin severing by villin analogous to the gelsolin helix-straightening mechanism.


    Organizational Affiliation

    Department of Chemistry, Western Washington University , 516 High Street, Bellingham, Washington 98225-9150, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Villin-1
A
107Gallus gallusGene Names: VIL1 (VIL)
Find proteins for P02640 (Gallus gallus)
Go to Gene View: VIL1
Go to UniProtKB:  P02640
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 600 
  • Conformers Submitted: 10 
  • Selection Criteria: target function 
  • Olderado: 2LLF Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-11-07
    Type: Initial release
  • Version 1.1: 2013-02-27
    Type: Derived calculations, Other
  • Version 1.2: 2015-04-15
    Type: Database references