CRYSTAL STRUCTURE OF PTERIDINE REDUCTASE 1 (PTR1) FROM TRYPANOSOMA BRUCEI IN TERNARY COMPLEX WITH COFACTOR (NADP+) AND INHIBITOR 6,7,7-TRIMETHYL-7,8-DIHYDROPTERIDINE-2,4- DIAMINE (DX3) 3JQ8 OXIDOREDUCTASE, PTERIDINE REDUCTASE, PTR1, TRYPANOSOMA BRUCEI, SHORT CHAIN DEHYDROGENASE, INHIBITOR