Glutamin—fruktoza-6-fosfat transaminaza (izomerizacija)

Glutamin—fruktoza-6-fosfat transaminaza (izomerizacija)
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EC broj2.6.1.16
CAS broj9030-45-9
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Glutamin—fruktoza-6-fosfat transaminaza (izomerizacija) (EC 2.6.1.16, heksozafosfatna aminotransferaza, glukozamin-6-fosfatna izomeraza (formira glutamin), glutamin-fruktoza-6-fosfatna transaminaza (izomerizacija), D-fruktoza-6-fosfatna amidotransferaza, glukozaminfosfatna izomeraza, glukozamin 6-fosfatna sintaza, GlcN6P sintaza) je enzim sa sistematskim imenom L-glutamin:D-fruktoza-6-fosfat izomeraza (deaminacija).[1][2][3][4] Ovaj enzim katalizuje sledeću hemijsku reakciju

L-glutamin + D-fruktoza 6-fosfat L-glutamat + D-glukozamin 6-fosfat

Mada je sveukupna reakcija tipična za transferaze, ona se odvija putem mehanizma koji obuhvata formiranje ketimina između fruktoza 6-fosfata i 6-amino grupa lizinskog ostatka aktivnog mesta.

Reference

  1. ^ Ghosh, S., Blumenthal, H.J., Davidson, E. and Roseman, S. (1960). „Glucosamine metabolism. V. Enzymatic synthesis of glucosamine 6-phosphate”. J. Biol. Chem. 235: 1265—1273. PMID 13827775. 
  2. ^ Gryder, R.M. & Pogell, B.M. (1960). „Further studies on glucosamine 6-phosphate synthesis by rat liver enzymes”. J. Biol. Chem. 235: 558—562. PMID 13829889. 
  3. ^ Leloir, L.F. & Cardini, C.E. (1953). „The biosynthesis of glucosamine”. Biochim. Biophys. Acta. 12: 15—22. PMID 13115409. 
  4. ^ Teplyakov, A., Obmolova, G., Badet-Denisot, M.A. and Badet, B. (1999). „The mechanism of sugar phosphate isomerization by glucosamine 6-phosphate synthase”. Protein Sci. 8: 596—602. PMID 10091662. 

Literatura

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