Haem a, cytochrome c and total protein turnover in mitochondria from rat heart and liver

Author:

Aschenbrenner V.1,Druyan R.1,Albin R.1,Rabinowitz M.1

Affiliation:

1. Departments of Medicine and Biochemistry, The Pritzker School of Medicine, University of Chicago, Chicago, Ill. 60637, U.S.A., and the Argonne Cancer Research Hospital, Chicago, Ill. 60637, U.S.A.

Abstract

Haem a and cytochrome c were isotopically labelled in mitochondria from rat heart and liver after injection of δ-amino[2,3-3H2]laevulate, a specific haem precursor. [guanido-14C]Arginine or l-[4,5-3H2]leucine were used to label mitochondrial proteins. Half-lives were measured from biological decay in vivo and were similar (5.5–6.2 days) for haem a, cytochrome c and [14C]arginine-labelled proteins. Labelling of hepatic mitochondrial proteins with [3H2]leucine resulted in a prolonged apparent half-life.

Publisher

Portland Press Ltd.

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