Abstract:
:Mature chromoplasts from daffodil (Narcissus pseudonarcissus) flowers, although devoid of thylakoid structures, contain immunologically detectable alpha-subunits of ATP-synthase (H(+)-transporting ATP phosphohydrolase; EC 3.6.3.14). To show the presence of the entire functional protein complex, chromoplast membrane proteins were solubilized and reconstituted in phosphatidylcholine liposomes. The membranes were energized by an acid-base transition in the presence of a K(+)/valinomycin diffusion potential, and the initial rate of ATP synthesis was measured with a luciferin/luciferase assay. In addition, by demonstrating NADPH-dependent ATP synthesis, we show that an NAD(P)H-dependent respiratory redox pathway in chromoplasts, previously identified as an important constituent of the carotene desaturation system, proceeds concomitant with membrane energization.
journal_name
Plantajournal_title
Plantaauthors
Morstadt L,Gräber P,De Pascalis L,Kleinig H,Speth V,Beyer Pdoi
10.1007/s00425-001-0724-ysubject
Has Abstractpub_date
2002-05-01 00:00:00pages
134-40issue
1eissn
0032-0935issn
1432-2048journal_volume
215pub_type
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