Source:http://linkedlifedata.com/resource/pubmed/id/14594950
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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
4
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pubmed:dateCreated |
2004-1-19
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pubmed:databankReference | |
pubmed:abstractText |
p94 (also called calpain 3) is the skeletal muscle-specific calpain and is considered to be a "modulator protease" in various cellular processes. Analysis of p94 at the protein level is an urgent issue because the loss of p94 protease activity causes limb-girdle muscular dystrophy type 2A. In this study, we enzymatically characterized one alternatively spliced variant of p94, p94:exons 6(-)15(-)16(-) (p94delta), which lacks two of the p94-specific insertion sequences. In contrast to p94, which has hardly been studied enzymatically due to its rapid, thorough, and apparently Ca(2+)-independent autolytic activity, p94delta was stably expressed in COS and insect cells. p94delta showed Ca(2+)-dependent caseinolytic and autolytic activities and an inhibitor spectrum similar to those of the conventional calpains. However, calpastatin did not inhibit p94delta and is a substrate for p94delta, which is consistent with the properties of p94, presenting p94 as a possible regulator of the conventional calpain system. We also established a semi-quantitative fluorescence resonance energy transfer assay using the calpastatin sequence specifically to measure p94 activity. This method detects the activity of COS-expressed p94 and p94delta, suggesting that it has potential to evaluate p94 activity in vivo and in the diagnosis of limb-girdle muscular dystrophy type 2A.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:month |
Jan
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pubmed:issn |
0021-9258
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:day |
23
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pubmed:volume |
279
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
2761-71
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:14594950-Alternative Splicing,
pubmed-meshheading:14594950-Amino Acid Sequence,
pubmed-meshheading:14594950-Animals,
pubmed-meshheading:14594950-Biological Assay,
pubmed-meshheading:14594950-COS Cells,
pubmed-meshheading:14594950-Calcium-Binding Proteins,
pubmed-meshheading:14594950-Calpain,
pubmed-meshheading:14594950-Cercopithecus aethiops,
pubmed-meshheading:14594950-Enzyme Activation,
pubmed-meshheading:14594950-Fluorescence,
pubmed-meshheading:14594950-Mice,
pubmed-meshheading:14594950-Molecular Sequence Data,
pubmed-meshheading:14594950-Muscle, Skeletal,
pubmed-meshheading:14594950-Sequence Deletion
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pubmed:year |
2004
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pubmed:articleTitle |
Possible regulation of the conventional calpain system by skeletal muscle-specific calpain, p94/calpain 3.
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pubmed:affiliation |
Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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