1GD3

refined solution structure of human cystatin A


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural comparison between wild-type and P25S human cystatin A by NMR spectroscopy. Does this mutation affect the a-helix conformation ?

Shimba, N.Kariya, E.Tate, S.Kaji, H.Kainosho, M.

(2000) J.STRUCT.FUNCT.GENOM. 1: 26-42

  • Primary Citation of Related Structures:  1GD4

  • PubMed Abstract: 
  • The effect of substituting Pro25, located in the alpha-helical region of the cystatin A structure, with Ser has been studied. The structures of wild type and P25S cystatin A were determined by multidimensional NMR spectroscopy under comparable condit ...

    The effect of substituting Pro25, located in the alpha-helical region of the cystatin A structure, with Ser has been studied. The structures of wild type and P25S cystatin A were determined by multidimensional NMR spectroscopy under comparable conditions. These two structures were virtually identical, and the alpha-helix between Glu15-Lys30 exists with uninterrupted continuity, with a slight bend at residue 25. In order to characterize the possible substitution effects of Pro25 with Ser on the alpha-helix, the chemical shifts of the amide nitrogens and protons, the generalized order parameters obtained by the analyses of the 15N-1H relaxation data, the amide proton exchange rates, and the NOE networks among the alpha-helical and surrounding residues were carefully compared. None of these parameters indicated any significant static or dynamic structural differences between the alpha-helical regions of the wild-type and P25S cystatin A proteins. We therefore conclude that our previous structure of the wild-type cystatin A, in which the alpha-helix exhibited a sharp kink at Pro25, must be revised. The asymmetric distribution of hydrophobic interactions between the side-chain residues of the alpha-helix and the rolled beta-sheet surface, as revealed by NOEs, may be responsible for the slight bend of the alpha-helix in both variants and for the destabilized hydrogen bonding of the alpha-helical residues that follow Pro25/Ser25, as evidenced by increased amide exchange rates.


    Organizational Affiliation

    Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo, 192-0397 Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYSTATIN A
A
98Homo sapiensGene Names: CSTA (STF1, STFA)
Find proteins for P01040 (Homo sapiens)
Go to Gene View: CSTA
Go to UniProtKB:  P01040
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-09-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance