ND3 and ND4L subunits of mitochondrial complex I, both nucleus encoded in Chlamydomonas reinhardtii, are required for activity and assembly of the enzyme
[en] Made of more than 40 subunits, the rotenone-sensitive NADH:ubiquinone oxidoreductase (complex I) is the most intricate membrane-bound enzyme of the mitochondrial respiratory chain. In vascular plants, fungi, and animals, at least seven complex I subunits (ND1, -2, -3, -4, -4L, -5, and -6; ND is NADH dehydrogenase) are coded by mitochondrial genes. The role of these highly hydrophobic subunits in the enzyme activity and assembly is still poorly understood. In the unicellular green alga Chlamydomonas reinhardtii, the ND3 and ND4L subunits are encoded in the nuclear genome, and we show here that the corresponding genes, called NUO3 and NUO11, respectively, display features that facilitate their expression and allow the proper import of the corresponding proteins into mitochondria. In particular, both polypeptides show lower hydrophobicity compared to their mitochondrion-encoded counterparts. The expression of the NUO3 and NUO11 genes has been suppressed by RNA interference. We demonstrate that the absence of ND3 or ND4L polypeptides prevents the assembly of the 950-kDa whole complex I and suppresses the enzyme activity. The putative role of hydrophobic ND subunits is discussed in relation to the structure of the complex I enzyme. A model for the assembly pathway of the Chlamydomonas enzyme is proposed.
Disciplines :
Microbiology
Author, co-author :
Cardol, Pierre ; Université de Liège - ULiège > Département des sciences de la vie > Biochimie végétale
Lapaille, Marie ; Université de Liège - ULiège > Département des sciences de la vie > Génétique
Minet, P.
Franck, Fabrice ; Université de Liège - ULiège > Département des sciences de la vie > Biochimie végétale
Matagne, René-Fernand ; Université de Liège - ULiège > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences)
Remacle, Claire ; Université de Liège - ULiège > Département des sciences de la vie > Génétique
Language :
English
Title :
ND3 and ND4L subunits of mitochondrial complex I, both nucleus encoded in Chlamydomonas reinhardtii, are required for activity and assembly of the enzyme
Publication date :
September 2006
Journal title :
Eukaryotic Cell
ISSN :
1535-9778
eISSN :
1535-9786
Publisher :
Amer Soc Microbiology, Washington, United States - Washington
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