Protein Structure from Scientific Research

Overall structure of P450Bltdemonstrating the classic P450 fold (alpha-helices A–L) together with three beta-sheets (beta-1 to beta-3). Active site secondary structure elements are colored: F/G-helices that cap the active site in sky blue and orange, beta-sheets 1 and 2 in magenta and chartreuse, D-helix in brown, E-helix in green, the B–B2 loop in blue, and I-helix in slate. The haem moiety is presented in black with its central iron atom as an orange sphere, highlighting the enzyme active site.

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