期刊
FEBS OPEN BIO
卷 9, 期 12, 页码 2126-2136出版社
WILEY
DOI: 10.1002/2211-5463.12752
关键词
allosteric regulation; ferredoxin; ferredoxin-NADP(+) reductase; negative cooperativity
资金
- Japan Society for the Promotion of Science [23570165]
- Grants-in-Aid for Scientific Research [23570165] Funding Source: KAKEN
Ferredoxin-NADP(+) reductase (FNR) in plants receives electrons from ferredoxin (Fd) at the end of the photosynthetic electron transfer chain and converts NADP(+) to NADPH. The interaction between Fd and FNR in plants was previously shown to be attenuated by NADP(H). Here, we investigated the molecular mechanism of this phenomenon using maize FNR and Fd, as the three-dimensional structure of this complex is available. NADPH, NADP(+), and 2 ' 5 '-ADP differentially affected the interaction, as revealed through kinetic and physical binding analyses. Site-directed mutations of FNR which change the affinity for NADPH altered the affinity for Fd in the opposite direction to that for NADPH. We propose that the binding of NADP(H) causes a conformational change of FNR which is transferred to the Fd-binding region through different domains of FNR, resulting in allosteric changes in the affinity for Fd.
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