Purification and properties of high molecular weight calpastatin from bovine brain.

Abstract:

:Calcium-activated neutral proteases (calpains) are regulated by specific endogenous protein inhibitors, the calpastatins, which are widely distributed in mammalian tissues. Calpastatins from different species or in various tissues from the same species exhibit considerable size heterogeneity on sodium dodecyl sulfate (SDS) gels, reflecting both transcriptional and posttranslational regulation. This heterogeneity has complicated previous biochemical characterizations. In this study, we purified bovine brain calpastatin to homogeneity. The inhibitor was purified 2,463-fold from a cytosolic fraction of fresh bovine cerebral cortex by chromatographies on diethylaminoethyl cellulose, Ultrogel AcA44, phenyl-Sepharose, concanavalin A-Sepharose, and Q-Sepharose. The major calpastatin displayed a native molecular mass of 250-300 kDa by gel filtration and was composed of 125-kDa polypeptide chains by SDS-polyacrylamide gel electrophoresis (SDS-PAGE). Small amounts of a 68-kDa calpastatin fragment were detected particularly in molecules exhibiting smaller native molecular mass (250 kDa). When electroeluted from SDS gels, the 125- and 68-kDa polypeptides each inhibited calpain. The purified protein was strongly immunoreactive toward antibodies raised against a synthetic peptide, CEKLGEKEETIPPDYR, shown to be a conserved repetitive motif in the calpastatin gene or a recombinant polypeptide corresponding to domains L and 1 of human calpastatin. Calpastatins purified from bovine and human erythrocytes exhibited molecular masses of 78 and 68 kDa, respectively, by SDS-PAGE. Both erythrocyte calpastatins reacted strongly with antibodies against the conserved sequence but not with antibodies raised against domains L and 1 of human calpastatin, indicating that the erythrocyte inhibitors lack these two domains.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Neurochem

authors

Mohan PS,Nixon RA

doi

10.1046/j.1471-4159.1995.64020859.x

subject

Has Abstract

pub_date

1995-02-01 00:00:00

pages

859-66

issue

2

eissn

0022-3042

issn

1471-4159

journal_volume

64

pub_type

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