1MQ1

Ca2+-S100B-TRTK-12 complex


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 17 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A novel S100 target conformation is revealed by the solution structure of the Ca2+-S100B-TRTK-12 complex.

McClintock, K.A.Shaw, G.S.

(2003) J.Biol.Chem. 278: 6251-6257

  • DOI: 10.1074/jbc.M210622200

  • PubMed Abstract: 
  • The Alzheimer-linked neural protein S100B is a signaling molecule shown to control the assembly of intermediate filament proteins in a calcium-sensitive manner. Upon binding calcium, a conformational change occurs in S100B exposing a hydrophobic surf ...

    The Alzheimer-linked neural protein S100B is a signaling molecule shown to control the assembly of intermediate filament proteins in a calcium-sensitive manner. Upon binding calcium, a conformational change occurs in S100B exposing a hydrophobic surface for target protein interactions. The synthetic peptide TRTK-12 (TRTKIDWNKILS), derived from random bacteriophage library screening, bears sequence similarity to several intermediate filament proteins and has the highest calcium-dependent affinity of any target molecule for S100B to date (K(d) <1 microm). In this work, the three-dimensional structure of the Ca(2+)-S100B-TRTK-12 complex has been determined by NMR spectroscopy. The structure reveals an extended, contiguous hydrophobic surface is formed on Ca(2+)-S100B for target interaction. The TRTK-12 peptide adopts a coiled structure that fits into a portion of this surface, anchored at Trp(7), and interacts with multiple hydrophobic contacts in helices III and IV of Ca(2+)-S100B. This interaction is strikingly different from the alpha-helical structures found for other S100 target peptides. By using the TRTK-12 interaction as a guide, in combination with other available S100 target structures, a recognition site on helix I is identified that may act in concert with the TRTK-12-binding site from helices III and IV. This would provide a larger, more complex site to interact with full-length target proteins and would account for the promiscuity observed for S100B target protein interactions.


    Organizational Affiliation

    Department of Biochemistry and McLaughlin Macromolecular Structure Facility, the University of Western Ontario, London, Ontario N6A 5C1, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
S-100 protein, beta chain
A, B
91Homo sapiensGene Names: S100B
Find proteins for P04271 (Homo sapiens)
Go to Gene View: S100B
Go to UniProtKB:  P04271
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
F-actin capping protein alpha-1 subunit
C, D
12Homo sapiensGene Names: CAPZA1
Find proteins for P52907 (Homo sapiens)
Go to Gene View: CAPZA1
Go to UniProtKB:  P52907
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 17 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 1MQ1 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-25
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance