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The PlyCA GyH domain is homologous to class IV chitinases. Superposition of the GyH domain (light blue) with a representative chitinase (orange; 2CJL: rmsd of 3.3 Å over 107 Cα atoms). The position of PlyCA GyH(Glu78) (blue asterisk) and the catalytic residue 2CJL(Glu68) (orange asterisk) is shown as a stick.
