Analysis of calcium-dependent interaction between amino-terminal conserved region of calpastatin functional domain and calmodulin-like domain of μ-calpain large subunit

Hong Qiong Yang, Hong Ma, Emiko Takano, Masakazu Hatanaka, Masatoshi Maki

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Calpain requires Ca2+ both for proteolysis of its substrates and for interaction with its endogenous inhibitor, calpastatin. Although calmodulin-like domains (CaMLDs) of large and small subunits of calpain have been suggested to be the sites for Ca2+-dependent interaction with calpastatin, specificity and molecular basis of the interaction have remained unclear. We investigated the interaction between the CaMLD of human μ-calpain large subunit expressed in Escherichia coli and a 19-residue synthetic oligopeptide corresponding to the region A (the amino-terminal conserved acidic region) of one of the four repetitive functional domains of calpastatin. The recombinant CaMLD bound to the oligopeptide immobilized on Sepharose beads in a Ca2+-dependent manner. The CaMLD failed in binding to a mutant oligopeptide with one amino acid substitution. Enhancement of fluorescence intensity of a hydrophobic probe, 2-(p-toluidino)naphthalene-6-sulfonate, was observed upon incubating with the CaMLD and further increased by Ca2+. The Ca2+-dependent enhancement of fluorescence intensity was strongly suppressed by the wild type oligopeptide, but not by the mutant one. Kinetic experiments were performed with BIAcore™ where binding of the CaMLD to the oligopeptide immobilized on a biosensor chip was detected as real time signals of surface plasmon resonance. The determined dissociation constant (KD) was 3.1 × 10-9 M. These results suggest that the region A of calpastatin binds to the CaMLD in a specific manner similar to interactions between calmodulin-binding peptides and calmodulin where hydrophobic properties are known to be important.

Original languageEnglish (US)
Pages (from-to)18977-18984
Number of pages8
JournalJournal of Biological Chemistry
Volume269
Issue number29
StatePublished - Jul 22 1994
Externally publishedYes

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Calpain
Calmodulin
Oligopeptides
Calcium
Fluorescence
Proteolysis
calpastatin
Surface Plasmon Resonance
Surface plasmon resonance
Biosensing Techniques
Amino Acid Substitution
Biosensors
Sepharose
Escherichia coli
Substitution reactions
Amino Acids
Peptides
Kinetics

ASJC Scopus subject areas

  • Biochemistry

Cite this

Analysis of calcium-dependent interaction between amino-terminal conserved region of calpastatin functional domain and calmodulin-like domain of μ-calpain large subunit. / Yang, Hong Qiong; Ma, Hong; Takano, Emiko; Hatanaka, Masakazu; Maki, Masatoshi.

In: Journal of Biological Chemistry, Vol. 269, No. 29, 22.07.1994, p. 18977-18984.

Research output: Contribution to journalArticle

Yang, Hong Qiong ; Ma, Hong ; Takano, Emiko ; Hatanaka, Masakazu ; Maki, Masatoshi. / Analysis of calcium-dependent interaction between amino-terminal conserved region of calpastatin functional domain and calmodulin-like domain of μ-calpain large subunit. In: Journal of Biological Chemistry. 1994 ; Vol. 269, No. 29. pp. 18977-18984.
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