We apologize for Proteopedia being slow to respond. For the past two years, a new implementation of Proteopedia has been being built. Soon, it will replace this 18-year old system. All existing content will be moved to the new system at a date that will be announced here.
↑ Vos S, de Jersey J, Martin JL. Crystal structure of Escherichia coli xanthine phosphoribosyltransferase. Biochemistry. 1997 Apr 8;36(14):4125-34. PMID:9100006 doi:10.1021/bi962640d