Partitioning roles of side chains in affinity, orientation, and catalysis with structures for mutant complexes: asparagine-229 in thymidylate synthase.
Finer-Moore, J.S., Liu, L., Schafmeister, C.E., Birdsall, D.L., Mau, T., Santi, D.V., Stroud, R.M.(1996) Biochemistry 35: 5125-5136
- PubMed: 8611496 
- DOI: 10.1021/bi952751x
- Primary Citation of Related Structures:  
1NJA, 1NJB, 1NJC, 1NJD, 1NJE - PubMed Abstract: 
Thymidylate synthase (TS) methylates only dUMP, not dCMP. The crystal structure of TS.dCMP shows sCMP 4-NH2 excluded from the space between Asn-229 and His-199 by the hydrogen bonding and steric properties and Asn-229. Consequently, 6-C of dCMP is over 4 A from the active site sulfhydryl ...