Article (Scientific journals)
Structural organization of mitochondrial human complex I: role of the ND4 and ND5 mitochondria-encoded subunits and interaction with prohibitin
Bourges, I.; Ramus, C.; de Camaret, B. M. et al.
2004In Biochemical Journal, 383 (Part 3), p. 491-499
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Keywords :
chaperone; complex I assembly; MS; NADH dehydrogenase; prohibitin
Abstract :
[en] Mitochondria-encoded ND (NADH dehydrogenase) subunits, as components of the hydrophobic part of complex I, are essential for NADH:ubiquinone oxidoreductase activity. Mutations or lack of expression of these subunits have significant pathogenic consequences in humans. However, the way these events affect complex I assembly is poorly documented. To understand the effects of particular mutations in ND subunits on complex I assembly, we studied four human cell lines: ND4 non-expressing cells, ND5 non-expressing cells, and rhodegrees cells that do not express any ND subunits, in comparison with normal complex I control cells. In control cells. all the seven analysed nuclear-encoded complex I subunits Were found to be attached to the mitochondrial inner membrane, except for the 24 kDa subunit, which was nearly equally partitioned between the membranes and the matrix. Absence of a single ND subunit, or even all the seven ND subunits, caused no major changes in the nuclear-encoded complex I subunit content of mitochondria. However, in cells lacking ND4 or ND5, very low amounts of 24 kDa subunit were found associated with the membranes, whereas most of the other nuclear-encoded subunits remained attached. In contrast, membrane association of most of the nuclear subunits was significantly reduced in the absence of all seven ND proteins. Immunopurification detected several subcomplexes. One of these, containing the 23, 30 and 49 kDa subunits, also contained prohibitin. This is the first description of prohibitin interaction with complex I subunits and suggests that this protein might play a role in the assembly or degradation of mitochondrial complex I.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Bourges, I.
Ramus, C.
de Camaret, B. M.
Beugnot, R.
Remacle, Claire  ;  Université de Liège - ULiège > Département des sciences de la vie > Génétique
Cardol, Pierre  ;  Université de Liège - ULiège > Département des sciences de la vie > Biochimie végétale
Hofhaus, G.
Issartel, J. P.
Language :
English
Title :
Structural organization of mitochondrial human complex I: role of the ND4 and ND5 mitochondria-encoded subunits and interaction with prohibitin
Publication date :
01 November 2004
Journal title :
Biochemical Journal
ISSN :
0264-6021
eISSN :
1470-8728
Publisher :
Portland Press, London, United Kingdom
Volume :
383
Issue :
Part 3
Pages :
491-499
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 January 2010

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