Inhibition kinetics of carba- and C-fucosyl analogues of GDP-fucose against fucosyltransferase V: implication for the reaction mechanism |
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| Authors: | Norris Andrew J Whitelegge Julian P Strouse M Jane Faull Kym F Toyokuni Tatsushi |
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| Affiliation: | Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at University of California, Los Angeles, CA 90095, USA. |
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| Abstract: | Inhibition kinetics of two isosteric analogues of GDP-fucose (GDP-Fuc) were investigated against fucosyltransferase V using electrospray ionization mass spectrometry coupled to multiple reaction monitoring. The carba-Fuc analogue was found to be a competitive inhibitor with a K(i) value of 67.1+/-9.8 microM, similar to the K(m) value for GDP-Fuc (50.4+/-5.5 microM), while the C-Fuc analogue exhibited significantly weak competitive inhibition with a K(i) value of 889+/-93 microM. |
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