4.4.1.32 | structure of the heterodimer of CpcE/F at 1.89 A resolution. Both subunits are twisted, crescent-shaped alpha-solenoid structures. CpcE has 15 and CpcF 10 helices. The inner (concave) layer of CpcE (helices h2, 4, 6, 8, 10, 12, and 14) and the outer (convex) layer of CpcF (h16, 18, 20, 22, and 24) form a cavity into which the phycocyanobilin chromophore can be modeled |
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