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. 2003 Sep 29;162(7):1245–1254. doi: 10.1083/jcb.200307067

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Copyright © 2003, The Rockefeller University Press

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Figure 8. — Model for cpSRP/cpFtsY targeting to the ALB3 translocase. cpFtsY (FtsY, red) is shown located both in the stroma and at the thylakoid membrane. cpSRP, composed of cpSRP54 (54, blue) and cpSRP43 (43, purple), with bound LHCP substrate (black line) binds to the membrane and forms a four-subunit complex with cpFtsY. This complex may form after all proteins are bound to the membrane, or the components may come together as they bind, but the order of events leading up to formation of a four-component complex is unclear. With both cpFtsY and cpSRP54 in the GTP-bound state, this large complex slides along the membrane until it reaches an open translocase containing ALB3 (ALB3, yellow) and possible unknown components (?, pink). Here, the substrate is released for integration, and GTP is hydrolyzed to release cpSRP and cpFtsY for further rounds of targeting.