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Regulation of the Ca2+-dependent neutral proteinases from rabbit liver by an endogenous inhibitor.

Abstract：

:An endogenous inhibitor of neutral Ca2+-dependent proteinases has been isolated from rabbit liver cytosol. The inhibitor is a heat-stable, 240-kDa, tetrameric protein. It is dissociated into its 60-kDa subunits by high concentrations of Ca2+ (0.1-1 mM), but not by lower concentrations in the physiological range. Inhibition of the 150-kDa proteinase of rabbit liver [Melloni, E., Pontremoli, S., Salamino, F., Sparatore, B., Michetti, M. and Horecker, B.L. (1984) Arch. Biochem. Biophys. 232, 505-512] requires the monomeric form of the inhibitor, and occurs only at the high concentrations of Ca2+ which also cause dissociation of the dimeric 150-kDa proteinase into its 80-kDa subunits. The molecular weight of the inactive proteinase-inhibitor complex was estimated by the equilibrium gel penetration method to be 140 kDa, suggesting that it contains one subunit of proteinase and one of inhibitor. The mechanism of interaction of the inhibitor with the 200-kDa proteinase at high concentrations of Ca2+ is identical to that observed for the 150-kDa proteinase, namely dissociation of both proteinase and inhibitor into subunits and formation of an inactive 160-kDa proteinase-inhibitor complex. However, unlike the 150-kDa proteinase, which does not interact with the inhibitor at low Ca2+ concentrations, the 200-kDa proteinase is also inhibited at low concentrations of Ca2+. Under these conditions, the high-molecular-weight complex (greater than 400 kDa) formed between the tetrameric inhibitor and the dimeric proteinase prevents conversion of the 200-kDa proenzyme to the active, low-Ca2+-requiring form.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Melloni E,Salamino F,Sparatore B,Michetti M,Pontremoli S,Horecker BL

doi

10.1016/0003-9861(84)90568-x

subject

Has Abstract

pub_date

1984-08-01 00:00:00

pages

513-9

issue

2

eissn

0003-9861

issn

1096-0384

pii

0003-9861(84)90568-X

journal_volume

232

pub_type

杂志文章

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