Homology model of Smlt1473. Homology model built using SWISS-MODEL and Protein Data Bank file 1QAZ as a template. Images were generated in PyMOL. A, surface model of Smlt1473. Black arrow indicates location of the putative catalytic residues in evident enzymatic cleft. B, tentative catalytic residues Asn167, His168, Arg215, and Tyr222 were found to be located in close proximity to each other.