Competitive inhibitors of type B ribose 5-phosphate isomerases: design, synthesis and kinetic evaluation of new D-allose and D-allulose 6-phosphate derivatives
2009 (English)In: Carbohydrate Research, ISSN 0008-6215, E-ISSN 1873-426X, Vol. 344, no 7, 869-880 p.Article in journal (Refereed) Published
This study reports syntheses Of D-allose 6-phosphate (All6P), D-allulose (or D-psicose) 6-phosphate (Allu6P), and seven D-ribose 5-phosphate isomerase (Rpi) inhibitors. The inhibitors were designed as analogues of the 6-carbon high-energy intermediate postulated for the All6P to Allu6P isomerization reaction (Allpi activity) catalyzed by type B Rpi from Escherichia coli (EcRpiB). 5-PhosphO-D-ribonate, easily obtained through oxidative cleavage of either All6P or Allu6P, led to the original synthon 5-dihydrogenopliospho-D-ribono-1,4-lactone from which the other inhibitors could be synthesized through nucleophilic addition in one step. Kinetic evaluation on Allpi activity of EcRpiB shows that two of these compounds. 5phospho-D-ribonohydroxamic acid and N-(5-phospho-D-ribonoyl)-methylamine, indeed behave as new efficient inhibitors of EcRpiB; further, 5-phospho-D-ribonohydroxamic acid was demonstrated to have competitive inhibition. Kinetic evaluation on Rpi activity of both EcRpiB and RpiB from Mycobacterium tuberculosis (MtRpiB) shows that several of the designed 6-carbon high-energy intermediate analogues are new competitive inhibitors of both RpiBs. One of them, 5-phospho-D-ribonate, not only appears as the strongest competitive inhibitor of a Rpi ever reported in the literature, with a K-i value of 9 mu M for MtRpiB, but also displays specific inhibition of MtRpiB versus EcRpiB.
Place, publisher, year, edition, pages
2009. Vol. 344, no 7, 869-880 p.
Sugar phosphates, Enzyme inhibitor, Hydroxamic acids, Ribose 5-phosphate isomerase, Allose 6-phosphate isomerase, Mycobacterium tuberculosis
IdentifiersURN: urn:nbn:se:uu:diva-129056DOI: 10.1016/j.carres.2009.02.024ISI: 000266192500004PubMedID: 19328460OAI: oai:DiVA.org:uu-129056DiVA: diva2:337517