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- W2790577178 abstract "Chlorophyll is synthesized from activated glutamate in the tetrapyrrole biosynthesis pathway through at least 20 different enzymatic reactions. Among these, the MgProto monomethylester (MgProtoME) cyclase catalyzes the formation of a fifth isocyclic ring to tetrapyrroles to form protochlorophyllide. The enzyme consists of two proteins. The CHL27 protein is proposed to be the catalytic component, while LCAA/YCF54 likely acts as a scaffolding factor. In comparison to other reactions of chlorophyll biosynthesis, this enzymatic step lacks clear elucidation and it is hardly understood, how electrons are delivered for the NADPH-dependent cyclization reaction. The present study intends to elucidate more precisely the role of LCAA/YCF54. Transgenic Arabidopsis lines with inactivated and overexpressed YCF54 reveal the mutual stability of YCF54 and CHL27. Among the YCF54-interacting proteins, the plastidal ferredoxin-NADPH reductase (FNR) was identified. We showed in N. tabacum and A. thaliana that a deficit of FNR1 or YCF54 caused MgProtoME accumulation, the substrate of the cyclase, and destabilization of the cyclase subunits. It is proposed that FNR serves as a potential donor for electrons required in the cyclase reaction and connects chlorophyll synthesis with photosynthetic activity." @default.
- W2790577178 created "2018-03-29" @default.
- W2790577178 creator A5010786028 @default.
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- W2790577178 creator A5063905826 @default.
- W2790577178 date "2018-03-22" @default.
- W2790577178 modified "2023-10-11" @default.
- W2790577178 title "Potential roles of<scp>YCF</scp>54 and ferredoxin‐<scp>NADPH</scp>reductase for magnesium protoporphyrin monomethylester cyclase" @default.
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- W2790577178 doi "https://doi.org/10.1111/tpj.13869" @default.
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