Solution structure and dynamics of human S100A1 protein modified at cysteine 85 with homocysteine disulfide bond formation in calcium saturated form

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 198 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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Impact of calcium binding and thionylation of S100A1 protein on its nuclear magnetic resonance-derived structure and backbone dynamics.

Nowakowski, M.Ruszczynska-Bartnik, K.Budzinska, M.Jaremko, L.Jaremko, M.Zdanowski, K.Bierzynski, A.Ejchart, A.

(2013) Biochemistry 52: 1149-1159

  • DOI: https://doi.org/10.1021/bi3015407
  • Primary Citation of Related Structures:  
    2LP2, 2LP3

  • PubMed Abstract: 

    S100 proteins play a crucial role in multiple important biological processes in vertebrate organisms acting predominantly as calcium signal transmitters. S100A1 is a typical representative of this family of proteins. After four Ca(2+) ions bind, it undergoes a dramatic conformational change, resulting in exposure, in each of its two identical subunits, a large hydrophobic cleft that binds to target proteins. It has been shown that abnormal expression of S100A1 is strongly correlated with a number of severe human diseases: cardiomyopathy and neurodegenerative disorders. A few years ago, we found that thionylation of Cys 85, the unique cysteine in two identical S100A1 subunits, leads to a drastic increase of the affinity of the protein for calcium. We postulated that the protein activated by thionylation becomes a more efficient calcium signal transmitter. Therefore, we decided to undertake, using nuclear magnetic resonance methods, a comparative study of the structure and dynamics of native and thionylated human S100A1 in its apo and holo states. In this paper, we present the results obtained for both forms of this protein in its holo state and compare them with the previously published structure of native apo-S100. The main conclusion that we draw from these results is that the increased calcium binding affinity of S100A1 upon thionylation arises, most probably, from rearrangement of the hydrophobic core in its apo form.

  • Organizational Affiliation

    Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106 Warsaw, Poland. lyam@chem.uw.edu.pl

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein S100-A1
A, B
93Homo sapiensMutation(s): 0 
Gene Names: S100A1S100A
UniProt & NIH Common Fund Data Resources
Find proteins for P23297 (Homo sapiens)
Explore P23297 
Go to UniProtKB:  P23297
PHAROS:  P23297
GTEx:  ENSG00000160678 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23297
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 198 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-20
    Type: Initial release
  • Version 1.1: 2014-08-27
    Changes: Database references
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection, Database references, Derived calculations
  • Version 2.1: 2024-04-03
    Changes: Structure summary