Download MendeleyCrystal structure of human carbonic anhydrase II complexed with an anti-convulsant sugar sulphamate.
Recacha, R., Costanzo, M.J., Maryanoff, B.E., Chattopadhyay, D.(2002) Biochem J 361: 437-441
- PubMed: 11802772
- DOI: https://doi.org/10.1042/0264-6021:3610437
- Primary Citation of Related Structures:
1EOU - PubMed Abstract:
The fructose-based sugar sulphamate RWJ-37497, a potent analogue of the widely used anti-epileptic drug topiramate, possesses anti-convulsant and carbonic anhydrase-inhibitory activities. We have studied the binding interactions of RWJ-37497 in the active site of human carbonic anhydrase II by X-ray crystallography. The atomic positions of the enzyme inhibitor complex were refined at a resolution of 2.1 A (1 A=0.1 nm) to the final crystallographic R and R(free) values of 0.18 and 0.23, respectively. The inhibitor co-ordinates to the active-site zinc ion through its oxygen atom and the ionized nitrogen atom of the sulphamate group by replacing the metal-bound water molecules, although the sulphamoyl oxygen atom provides a rather lengthy co-ordination. The 4,5-cyclic sulphate group is positioned in a hydrophobic pocket of the active site, making contacts with the residues Phe-131, Leu-198, Pro-201 and Pro-202. Since the ligand was found to be intact, concerns about RWJ-37947 irreversibly alkylating the enzyme through its 4,5-cyclic sulphate group were dispelled.
Organizational Affiliation:
Center for Biophysical Sciences and Engineering, and School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
