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. Author manuscript; available in PMC: 2014 Apr 1.
Published in final edited form as: Biochemistry. 2012 Sep 27;51(40):7953–7963. doi: 10.1021/bi300867t

Figure 5.

Figure 5

Comparison of representative structures from class A–D sortases. B. anthracis class D enzymes are structurally similar to class A enzymes. BaSrtC lacks the long, structured, β6–β7 loop (yellow) present in class B enzymes, but the appearance of a short 310-helix in this region likely indicates the existence of a rigid substrate-binding pocket, similar to BaSrtA. BaSrtC also lacks the structured N-terminal lid present in class C enzymes (green).