Details
| Original language | English |
|---|---|
| Pages (from-to) | 114-122 |
| Number of pages | 9 |
| Journal | Physiologia plantarum |
| Volume | 129 |
| Issue number | 1 |
| Publication status | Published - 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 subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Physiology
- Biochemistry, Genetics and Molecular Biology(all)
- Genetics
- Agricultural and Biological Sciences(all)
- Plant Science
- Biochemistry, Genetics and Molecular Biology(all)
- Cell Biology
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In: Physiologia plantarum, Vol. 129, No. 1, 18.09.2006, p. 114-122.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Carbonic anhydrase subunits of the mitochondrial NADH dehydrogenase complex (complex I) in plants
AU - Braun, Hans Peter
AU - Zabaleta, Eduardo
PY - 2006/9/18
Y1 - 2006/9/18
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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=33845612757&partnerID=8YFLogxK
U2 - 10.15488/11666
DO - 10.15488/11666
M3 - Article
AN - SCOPUS:33845612757
VL - 129
SP - 114
EP - 122
JO - Physiologia plantarum
JF - Physiologia plantarum
SN - 0031-9317
IS - 1
ER -