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Effect of extra- and intra-mitochondrial calcium on citrulline synthesis
Journal article   Peer reviewed

Effect of extra- and intra-mitochondrial calcium on citrulline synthesis

A Saavedra-molina and T Devlin
Amino acids, v 12(3-4), pp 293-298
01 Sep 1997

Abstract

Calcium Materials science
A quantitative relationship between rat liver mitochondrial matrix free Ca^sup 2+^ ([Ca^sup 2+^]^sub m^) and citrullinogenesis has been observed. Maximum citrulline synthesis occurred at 100 to 200nM [Ca^sup 2+^]^sub m^; higher [Ca^sup 2+^]^sub m^ caused inhibition. When [Ca^sup 2+^]^sub m^ was decreased to below 50nM, by addition of A23187 and EGTA, inhibition also occurred. By incubating mitochondria with ruthenium red ([Ca^sup 2+^]^sub m^ = 200nM) prior to addition of extramitochondrial free Ca^sup 2+^ ([Ca^sup 2+^]^sub o^) it was found that high external Ca^sup 2+^ (800nM) did not inhibit citrulline synthesis thus demonstrating that [Ca2+]m, not [Ca^sup 2+^]^sub o^ was controlling citrullinogenesis.[PUBLICATION ABSTRACT]

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Biochemistry & Molecular Biology
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