The cytosol of human erythrocytes contains a highly Ca2+-sensitive thiol protease (calpain I) and its specific inhibitor protein (calpastatin).

The cytosol of human erythrocytes contains a highly Ca2+-sensitive thiol protease (calpain I) and its specific inhibitor protein (calpastatin). Research Abstract Details 

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The cytosol of human erythrocytes contains a highly Ca2+-sensitive thiol protease (calpain I) and its specific inhibitor protein (calpastatin). Abstract Text:

T Murakami,M Hatanaka,T Murachi,

The cytosol of human erythrocytes was found to contain a Ca2+-dependent thiol protease (calpain) and its specific inhibitor (calpastatin) by DEAE-cellulose chromatography at pH 8.0, although no proteolytic activity toward casein was detected in the unfractionated hemolysate. The protease required only 40 microM Ca2+ for 50% activation, indicating that it belongs to the highly Ca2+-sensitive type of calpain, namely, calpain I. It was not inactivated by heating at 58 degrees C for 10 min at pH 7.2, the optimal pH for its action on casein. The inhibitor comprised major and minor components, calpastatin H (Mr = 280,000) and caplastatin L (Mr = 48,000). Both were heat-stable proteins which were readily inactivated by tryptic digestion. The inhibition of erythrocyte calpain by erythrocyte calpastatin H or L was not due to sequestering of Ca2+ from the reaction medium by the inhibitor protein. The calpain preparation preferentially digests bands III and IVa of human erythrocyte membrane proteins, with little or no cleavage of the bands corresponding to spectrin.

The cytosol of human erythrocytes contains a highly Ca2+-sensitive thiol protease (calpain I) and its specific inhibitor protein (calpastatin). Publishing Authors By Initials

T Murakami,M Hatanaka,T Murachi,

For similar chemical actions and uses: pharmacologic actions: molecular mechanisms of pharmacological action: enzyme inhibitors: protease inhibitors research abstracts see: chemical actions and uses: pharmacologic actions: molecular mechanisms of pharmacological action: enzyme inhibitors: protease inhibitors research

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The cytosol of human erythrocytes contains a highly Ca2+-sensitive thiol protease (calpain I) and its specific inhibitor protein (calpastatin). Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of biochemistry

VOLUME: 90

Page Numbers: 1809-16

Journal Abbreviation: J. Biochem.

ISSN: 0021-924X

DAY: 19

MONTH: Dec

YEAR: 1981

The cytosol of human erythrocytes contains a highly Ca2+-sensitive thiol protease (calpain I) and its specific inhibitor protein (calpastatin). Information

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LANGUAGE: eng

NlmUniqueID: 376600

The cytosol of human erythrocytes contains a highly Ca2+-sensitive thiol protease (calpain I) and its specific inhibitor protein (calpastatin). Keywords Mesh Terms:

KEYWORDS: Protease Inhibitors

MESH TERMS: blood

Chemical & Substance for Abstract: The cytosol of human erythrocytes contains a highly Ca2+-sensitive thiol protease (calpain I) and its specific inhibitor protein (calpastatin). Information

Substance Name: Calpain

Registry Number: EC 3.4.22.-

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MEDLINETA: J Biochem

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