3FG6

Structure of the C-terminus of Adseverin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.244 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of the C-terminus of adseverin reveals the actin-binding interface.

Chumnarnsilpa, S.Lee, W.L.Nag, S.Kannan, B.Larsson, M.Burtnick, L.D.Robinson, R.C.

(2009) Proc.Natl.Acad.Sci.USA 106: 13719-13724

  • DOI: 10.1073/pnas.0812383106

  • PubMed Abstract: 
  • Adseverin is a member of the calcium-regulated gelsolin superfamily of actin severing and capping proteins. Adseverin comprises 6 homologous domains (A1-A6), which share 60% identity with the 6 domains from gelsolin (G1-G6). Adseverin is truncated in ...

    Adseverin is a member of the calcium-regulated gelsolin superfamily of actin severing and capping proteins. Adseverin comprises 6 homologous domains (A1-A6), which share 60% identity with the 6 domains from gelsolin (G1-G6). Adseverin is truncated in comparison to gelsolin, lacking the C-terminal extension that masks the F-actin binding site in calcium-free gelsolin. Biochemical assays have indicated differences in the interaction of the C-terminal halves of adseverin and gelsolin with actin. Gelsolin contacts actin through a major site on G4 and a minor site on G6, whereas adseverin uses a site on A5. Here, we present the X-ray structure of the activated C-terminal half of adseverin (A4-A6). This structure is highly similar to that of the activated form of the C-terminal half of gelsolin (G4-G6), both in arrangement of domains and in the 3 bound calcium ions. Comparative analysis of the actin-binding surfaces observed in the G4-G6/actin structure suggests that adseverin in this conformation will also be able to interact with actin through A4 and A6, whereas the A5 surface is obscured. A single residue mutation in A4-A6 located at the predicted A4/actin interface completely abrogates actin sequestration. A model of calcium-free adseverin, constructed from the structure of gelsolin, predicts that in the absence of a gelsolin-like C-terminal extension the interaction between A2 and A6 provides the steric inhibition to prevent interaction with F-actin. We propose that calcium binding to the N terminus of adseverin dominates the activation process to expose the F-actin binding site on A2.


    Organizational Affiliation

    Institute of Molecular and Cell Biology, Agency for Science, Technology, and Research (ASTAR), 61 Biopolis Drive, Proteos, Singapore 138673.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Adseverin
A, C, G, E, F, H, D, B
371Homo sapiensMutation(s): 0 
Gene Names: SCIN (KIAA1905)
Find proteins for Q9Y6U3 (Homo sapiens)
Go to Gene View: SCIN
Go to UniProtKB:  Q9Y6U3
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.244 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 67.644α = 88.79
b = 90.384β = 88.26
c = 98.839γ = 76.26
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing
SCALEPACKdata scaling
DENZOdata reduction
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-12-05 
  • Released Date: 2009-08-11 
  • Deposition Author(s): Robinson, R.C.

Revision History 

  • Version 1.0: 2009-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2017-11-01
    Type: Refinement description