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Transport of proteins into hepatic and nonhepatic mitochondria: specificity of uptake and processing of precursor forms of carbamoyl-phosphate synthetase I.

Abstract：

:An in vitro system reconstituted with mouse liver polysome translation products was used to study the nature of polypeptide species imported into mitochondria from different mouse tissues such as liver, kidney, brain, and heart, as well as from Ehrlich ascites, Novikoff hepatoma, and Morris hepatoma 3924A tumor lines. Mouse hepatic mitochondria import a number of proteins including 160-kilodalton (kDa) carbamoyl-phosphate synthetase I (CPS-I). Two other proteins of 63 and 57 kDa of unknown function are also imported as major components by mouse liver mitochondria. Under these in vitro conditions, however, mitochondria from non-CPS-I expressing tissues such as brain, kidney, and heart failed to import and process the precursor forms of CPS-I (pCPS-I). Furthermore, mitochondria from three different tumor lines (Novikoff hepatoma, Morris hepatoma, and Ehrlich ascites) containing negligible CPS-I activity were also unable to import and process pCPS-I to any significant level. Similarly, the 63-kDa protein was selectively transported into liver and kidney mitochondria and also into Ehrlich ascites mitochondria at reduced levels, but not into mitochondria from heart and brain. Nevertheless, the 57-kDa protein and a number of proteins of less than 45 kDa are transported efficiently by all of the mitochondrial types studied. These results provide evidence for tissue- or cell-specific selectivity at the mitochondrial membrane level for the transport of some proteins. The transports of 63- and 57-kDa proteins are differentially inhibited by mouse liver mitochondrial matrix and membrane fractions, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Biochemistry

journal_title

Biochemistry

authors

Bhat NK,Avadhani NG

doi

10.1021/bi00348a041

subject

Has Abstract

pub_date

1985-12-31 00:00:00

pages

8107-13

issue

27

eissn

0006-2960

issn

1520-4995

journal_volume

24

pub_type

杂志文章

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