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  Flexibility analysis and structure comparison of two crystal forms of calcium-free human m-calpain

Reverter, D., Braun, M., Fernandez-Catalan, C., Strobl, S., Sorimachi, H., & Bode, W. (2002). Flexibility analysis and structure comparison of two crystal forms of calcium-free human m-calpain. Biological Chemistry, 383(9), 1415-1422.

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Genre: Journal Article
Alternative Title : Biol. Chem.

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 Creators:
Reverter, D., Author
Braun, M.1, Author           
Fernandez-Catalan, C., Author
Strobl, S., Author
Sorimachi, H., Author
Bode, W.2, 3, 4, Author           
Affiliations:
1External Organizations, ou_persistent22              
2Fässler, Reinhard / Molecular Medicine, Max Planck Institute of Biochemistry, Max Planck Society, ou_1565147              
3Huber, Robert / Structure Research, Max Planck Institute of Biochemistry, Max Planck Society, ou_1565155              
4Conti, Elena / Structural Cell Biology, Max Planck Institute of Biochemistry, Max Planck Society, ou_1565144              

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Free keywords: calcium activation; calpains; crystal structures; flexibility; hydrolysis
 Abstract: The calpains form a growing family of structurally related intracellular multidomain cysteine proteinases containing a papain-related catalytic domain, whose activity depends on calcium. The calpains are believed to play important roles in cytoskelatel remodeling processes, cell differentiation, apoptosis and signal transduction, but are also implicated in a number of diseases. Recent crystal structures of truncated rat and full-length human apo-m-calpain revealed the domain arrangement and explained the inactivity of m-calpain in the absence of calcium by a disrupted catalytic domain. Proteolysis studies have indicated several susceptible sites, in particular in the catalytic subdomain IIb and in the following domain III, which are more accessible to attacking proteinases in the presence than in the absence of calcium. The current view is that m-calpain exhibits a number of calcium binding sites, which upon calcium binding cooperatively interact, triggering the reformation of a papain-like catalytic domain, accompanied by enhanced mobilisation of the whole structure. To further analyse the flexibility of m-calpain, we have determined and refined the human full-length apo-m-calpain structure of a second crystal form to 3.15 Angstrom resolution. Here we present this new structure, compare it with our first structure now re-refined with tighter constrain parameters, discuss the flexibility in context with the proteolysis and calcium binding data available, and suggest implications for the calcium- induced activation process.

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Language(s): eng - English
 Dates: 2002-09
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 41710
ISI: 000178038300012
 Degree: -

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Title: Biological Chemistry
  Alternative Title : Biol. Chem.
Source Genre: Journal
 Creator(s):
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Publ. Info: -
Pages: - Volume / Issue: 383 (9) Sequence Number: - Start / End Page: 1415 - 1422 Identifier: ISSN: 1431-6730