Fig. 4

Four conserved domains of the Cs-CSRP1 protein structure and their active sites. From left to right are the overall structure of Cs-CSRP1 protein, the single functional domain structure of Cs-CSRP1 protein, and the active sites of Cs-CSRP1 protein. Key structural features of the single functional domain: Greek key β-barrel core (purple), partial ESL (yellow), active site arginine (Arg-388), disulfide ring with cysteine (light blue), copper is a pink sphere, and its coordinating residues histidine (His-291, His-293, His-381). Dynamic histidine (His-316) is blue, and Glu-339 and Asp-342 are orange and green. The dashed lines in yellow indicate the hydrogen bond network.