1CYU

SOLUTION NMR STRUCTURE OF RECOMBINANT HUMAN CYSTATIN A UNDER THE CONDITION OF PH 3.8 AND 310K


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 15 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Solution structure of a human cystatin A variant, cystatin A2-98 M65L, by NMR spectroscopy. A possible role of the interactions between the N- and C-termini to maintain the inhibitory active form of cystatin A.

Tate, S.Ushioda, T.Utsunomiya-Tate, N.Shibuya, K.Ohyama, Y.Nakano, Y.Kaji, H.Inagaki, F.Samejima, T.Kainosho, M.

(1995) Biochemistry 34: 14637-14648

  • DOI: 10.1021/bi00045a004
  • Primary Citation of Related Structures:  
    1CYV, 1CYU

  • PubMed Abstract: 
  • The solution structure of a human cystatin A variant, cystatin A2-98 M65L, which maintains the full inhibitory activity of the wild-type protein, was determined at pH 3.8 by sD/3D heteronuclear double- and triple-resonance NMR spectroscopy. The structure is based on a total of 1343 experimental restraints, comprising 1139 distance, 154 phi and chi 1 torsion angle restraints, and 50 distance constraints for 25 backbone hydrogen bonds ...

    The solution structure of a human cystatin A variant, cystatin A2-98 M65L, which maintains the full inhibitory activity of the wild-type protein, was determined at pH 3.8 by sD/3D heteronuclear double- and triple-resonance NMR spectroscopy. The structure is based on a total of 1343 experimental restraints, comprising 1139 distance, 154 phi and chi 1 torsion angle restraints, and 50 distance constraints for 25 backbone hydrogen bonds. A total of 15 structures was calculated using the YASAP protocol with X-PLOR, and the atomic rms distribution about the mean coordinate positions for residues 8-93 was 0.55 +/- 0.10 A for the backbone atoms and 1.05 +/- 0.11 A for all heavy atoms. The structure consists of five antiparallel beta-sheets and two short alpha-helices. Comparison with the X-ray structure of cystatin B in the papain complex shows that the conformation of the first binding loop is quite similar to that of cystatin A, with an rms deviation of 0.78 A for the backbone atoms in the 43-53 region (cystatin A numbering). The second binding loop, however, is significantly different in the two structures, with an rms deviation greater than 2 A. There are some other significant differences, especially for the N-terminal and alpha-helix regions. The overall structure of cystatin A is also compared with the recently reported NMR structure of the wild-type cystatin A (stefin A) at pH 5.5 (Martin et al., 1995) and reveals the following features. that differ in our structure from the previous one: (1) the N-terminal segment, which was unstructured in the previous report, folds over in close vicinity to the C-terminus, as revealed by the distinctive NOEs between those segments; (2) two discrete short alpha-helices linked by a type II reverse turn were found, instead of the continuous single alpha-helix with a slight kink shown in the previous structure; (3) the second binding loop, which was not well converged in the previous study at pH 5.5, is determined very well in our structure. The effect of the N-terminal truncation on the cystatin A structure was examined by comparing the 1H-15N HSQC spectrum of cystatin A2-98 with that of the cystatin A5-98 variant, which lacks the anti-papain activity, revealing significant chemical shift differences in the residual N-terminal segment and the first binding loop, together with small shifts in the other parts.(ABSTRACT TRUNCATED AT 400 WORDS)


    Organizational Affiliation

    Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CYSTATIN AA98Homo sapiensMutation(s): 1 
Gene Names: CSTASTF1STFA
UniProt & NIH Common Fund Data Resources
Find proteins for P01040 (Homo sapiens)
Explore P01040 
Go to UniProtKB:  P01040
PHAROS:  P01040
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 15 
  • OLDERADO: 1CYU Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1995-12-07
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance