Download MendeleyAnion binding at the active site of trypanosomal triosephosphate isomerase. Monohydrogen phosphate does not mimic sulphate.
Verlinde, C.L., Noble, M.E., Kalk, K.H., Groendijk, H., Wierenga, R.K., Hol, W.G.(1991) Eur J Biochem 198: 53-57
- PubMed: 2040290
- DOI: https://doi.org/10.1111/j.1432-1033.1991.tb15985.x
- PubMed Abstract:
The three-dimensional structure of triosephosphate isomerase complexed with the competitive inhibitor SO-4(2) was determined by X-ray crystallography to a resolution of 0.24 nm. A comparison with the native crystal structure, where SO-4(2) is bound, revealed five changes: (a) a 0.10-nm shift of the anion-binding site; (b) a further closing of the flexible loop of the enzyme; (c) a 'swinging in' of the side chain of the catalytic Glu, that is chi 1 changes from (+) to (-) synclinal; (d) an altered water structure; (e) a disappearance of the conformational heterogeneity at the C-terminus of strand beta 7. Some of these changes may be related to the different hydrogen-bond pattern about the two different anions. However, the distance of 0.10 nm between the sulphur and phosphorus positions is unexpected and remains intriguing.
Organizational Affiliation:
BIOSON Research Institute, University of Groningen, The Netherlands.
