Article (Scientific journals)
In Chlamydomonas, the Loss of Nd5 Subunit Prevents the Assembly of Whole Mitochondrial Complex I and Leads to the Formation of a Low Abundant 700 Kda Subcomplex
Cardol, Pierre; Boutaffala, Layla; Memmi, S. et al.
2008In Biochimica et Biophysica Acta. Bioenergetics, 1777, p. 388-396
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Abstract :
[en] In the green alga Chlamydomonas reinhardtii, a mutant deprived of complex I enzyme activity presents a 1T deletion in the mitochondrial nd5 gene. The loss of the ND5 subunit prevents the assembly of the 950 kDa whole complex I. Instead, a low abundant 700 kDa subcomplex, loosely associated to the inner mitochondrial membrane, is assembled. The resolution of the subcomplex by SDS-PAGE gave rise to 19 individual spots, sixteen having been identified by mass spectrometry analysis. Eleven, mainly associated to the hydrophilic part of the complex, are homologs to subunits of the bovine enzyme whereas five (including gamma-type carbonic anhydrase subunits) are specific to green plants or to plants and fungi. None of the subunits typical of the beta membrane domain of complex I enzyme has been identified in the mutant. This allows us to propose that the truncated enzyme misses the membrane distal domain of complex I but retains the proximal domain associated to the matrix arm of the enzyme. A complex I topology model is presented in the light of our results. Finally, a supercomplex most probably corresponding to complex I-complex III association, was identified in mutant mitochondria, indicating that the missing part of the enzyme is not required for the formation of the supercomplex.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Cardol, Pierre  ;  Université de Liège - ULiège > Département des sciences de la vie > Biochimie végétale
Boutaffala, Layla ;  Université de Liège - ULiège > Virologie - Immunologie
Memmi, S.
Devreese, B.
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 :
In Chlamydomonas, the Loss of Nd5 Subunit Prevents the Assembly of Whole Mitochondrial Complex I and Leads to the Formation of a Low Abundant 700 Kda Subcomplex
Publication date :
16 January 2008
Journal title :
Biochimica et Biophysica Acta. Bioenergetics
ISSN :
0005-2728
eISSN :
1879-2650
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
1777
Pages :
388-396
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 January 2010

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