Carbonic anhydrase subunits of the mitochondrial NADH dehydrogenase complex (complex I) in plants

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

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  • Universidad Nacional de Mar del Plata
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Details

OriginalspracheEnglisch
Seiten (von - bis)114-122
Seitenumfang9
FachzeitschriftPhysiologia plantarum
Jahrgang129
Ausgabenummer1
PublikationsstatusVeröffentlicht - 18 Sept. 2006

Abstract

The mitochondrial nicotinamide adenine dinucleotide, reduced (NADH) dehydrogenase complex (complex I) of plants has a molecular mass of about 1000 kDa and is composed of more than 40 distinct protein subunits. About three quarter of these subunits are homologous to complex I subunits of heterotrophic eukaryotes, whereas the remaining subunits are unique to plants. Among them are three to five structurally related proteins that resemble an archaebacterial γ-type carbonic anhydrase (γCA). The γCA subunits are attached to the membrane arm of complex I on the matrix-exposed side and form an extra spherical domain. At the same time, they span the inner mitochondrial membrane and are essential for assembly of the protein complex. Expression of the genes encoding γCA subunits is reduced if plants are cultivated in the presence of elevated CO2 concentration. The functional role of these subunits within plant mitochondria is currently unknown but might be related to photorespiration. We propose that the complex I-integrated γCAs are involved in mitochondrial HCO3- formation to allow efficient recycling of inorganic carbon for CO2 fixation in chloroplasts under high light conditions.

ASJC Scopus Sachgebiete

  • Biochemie, Genetik und Molekularbiologie (insg.)
  • Physiologie
  • Biochemie, Genetik und Molekularbiologie (insg.)
  • Genetik
  • Agrar- und Biowissenschaften (insg.)
  • Pflanzenkunde
  • Biochemie, Genetik und Molekularbiologie (insg.)
  • Zellbiologie

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Carbonic anhydrase subunits of the mitochondrial NADH dehydrogenase complex (complex I) in plants. / Braun, Hans Peter; Zabaleta, Eduardo.
in: Physiologia plantarum, Jahrgang 129, Nr. 1, 18.09.2006, S. 114-122.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Braun HP, Zabaleta E. Carbonic anhydrase subunits of the mitochondrial NADH dehydrogenase complex (complex I) in plants. Physiologia plantarum. 2006 Sep 18;129(1):114-122. doi: 10.15488/11666, 10.1111/j.1399-3054.2006.00773.x
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N2 - The mitochondrial nicotinamide adenine dinucleotide, reduced (NADH) dehydrogenase complex (complex I) of plants has a molecular mass of about 1000 kDa and is composed of more than 40 distinct protein subunits. About three quarter of these subunits are homologous to complex I subunits of heterotrophic eukaryotes, whereas the remaining subunits are unique to plants. Among them are three to five structurally related proteins that resemble an archaebacterial γ-type carbonic anhydrase (γCA). The γCA subunits are attached to the membrane arm of complex I on the matrix-exposed side and form an extra spherical domain. At the same time, they span the inner mitochondrial membrane and are essential for assembly of the protein complex. Expression of the genes encoding γCA subunits is reduced if plants are cultivated in the presence of elevated CO2 concentration. The functional role of these subunits within plant mitochondria is currently unknown but might be related to photorespiration. We propose that the complex I-integrated γCAs are involved in mitochondrial HCO3- formation to allow efficient recycling of inorganic carbon for CO2 fixation in chloroplasts under high light conditions.

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