Fig. 9: Model of the role of DEIP1 in the assembly of the Cytb6f complex. | Nature Communications

Fig. 9: Model of the role of DEIP1 in the assembly of the Cytb6f complex.

From: De-etiolation-induced protein 1 (DEIP1) mediates assembly of the cytochrome b6f complex in Arabidopsis

Fig. 9

① PetB and PetA are co-translationally inserted into the thylakoid membrane. Free DEIP1 is present as a homodimer. ② After its insertion into the membrane, PetD associates with PetB and DEIP1, and possibly other auxiliary factors. In parallel, PetA associates with PETC and DEIP1. The binding of DEIP1 to both heterodimers may bring the two subcomplexes in close proximity, thus facilitating their association. Transition of this unstable core complex to the stable monomeric Cytb6f likely requires addition of the small subunits PetL, PetG, PetN, and PETM. ③ DEIP1 removal from the complex promotes the association of two monomers. ④ Formation of the stable dimeric Cytb6f complex from two monomers completes the assembly process. See text for details. Images of the Cytb6f complex and its subunits were obtained from rcsb.org85 PDB ID 6RQF25.

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