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Two Proteins Homologous to PsbQ are Novel Subunits of the Chloroplast NAD(P)H Dehydrogenase
Tekijät: Suorsa M, Sirpio S, Paakkarinen V, Kumari N, Holmstrom M, Aro EM
Kustantaja: OXFORD UNIV PRESS
Julkaisuvuosi: 2010
Journal: Plant and Cell Physiology
Tietokannassa oleva lehden nimi: PLANT AND CELL PHYSIOLOGY
Lehden akronyymi: PLANT CELL PHYSIOL
Vuosikerta: 51
Numero: 6
Aloitussivu: 877
Lopetussivu: 883
Sivujen määrä: 7
ISSN: 0032-0781
DOI: https://doi.org/10.1093/pcp/pcq070
Tiivistelmä
The PsbQ-like (PQL) proteins 1 and 2, previously shown to be located in the thylakoid lumen of Arabidopsis thaliana, are homologous to PSII oxygen-evolving complex protein PsbQ. Nevertheless, pql mutants showed no defects in PSII but instead the activity of the chloroplast NAD(P)H dehydrogenease (NDH) complex was severely impaired. In line with this observation, the NDH subunits were low in abundance in pql mutants, and, conversely, ndh mutants strongly down-regulated the accumulation of the PQL proteins. In addition, the PQL2 protein was up-regulated in mutant plants deficient in the PSI complex or the thylakoid membrane-bound ferredoxin-NADP+ oxidoreductase, whereas in pql mutants the PSI complex was slightly up-regulated. Taken together, the two PQL proteins are shown to be novel subunits of the lumenal protuberance of the NDH complex.
The PsbQ-like (PQL) proteins 1 and 2, previously shown to be located in the thylakoid lumen of Arabidopsis thaliana, are homologous to PSII oxygen-evolving complex protein PsbQ. Nevertheless, pql mutants showed no defects in PSII but instead the activity of the chloroplast NAD(P)H dehydrogenease (NDH) complex was severely impaired. In line with this observation, the NDH subunits were low in abundance in pql mutants, and, conversely, ndh mutants strongly down-regulated the accumulation of the PQL proteins. In addition, the PQL2 protein was up-regulated in mutant plants deficient in the PSI complex or the thylakoid membrane-bound ferredoxin-NADP+ oxidoreductase, whereas in pql mutants the PSI complex was slightly up-regulated. Taken together, the two PQL proteins are shown to be novel subunits of the lumenal protuberance of the NDH complex.
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