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 

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This is version 1.3 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: https://doi.org/10.1021/bi00045a004
  • Primary Citation of Related Structures:  
    1CYU, 1CYV

  • 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. 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
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CYSTATIN A98Homo sapiensMutation(s): 1 
UniProt & NIH Common Fund Data Resources
Find proteins for P01040 (Homo sapiens)
Explore P01040 
Go to UniProtKB:  P01040
PHAROS:  P01040
GTEx:  ENSG00000121552 
Entity Groups  
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UniProt GroupP01040
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 15 

Structure Validation

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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
  • Version 1.3: 2021-11-03
    Changes: Database references, Derived calculations, Other