anonymous
  • anonymous
Dr. Weinberg, in your Biochem lecture 2 you implied that cells readily convert galactose to glucose. I know that fructose can be converted enzymatically (invertase) to glucose, but what enzyme converts galactose to glucose?
MIT OCW Biology
chestercat
  • chestercat
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anonymous
  • anonymous
The main pathway of galactose metabolism is the Leloir pathway; humans and other species, however, have been noted to contain several alternate pathways, such as the De Ley Doudoroff pathway. The Leloir pathway consists of the latter stage of a two-part process that converts β-D-galactose to UDP-glucose. The initial stage is the conversion of β-D-galactose to α-D-galactose by the enzyme, mutarotase (GALM). The Leloir pathway then carries out the conversion of α-D-galactose to UDP-glucose via three principle enzymes. Galactokinase (GALK) phosphorylates α-D-galactose to galactose-1-phosphate, or Gal-1-P. Galactose-1-phosphate uridyltransferase (GALT) then transfers a UMP group from UDP-glucose to Gal-1-P to form UDP-galactose. Finally, UDP galactose-4’-epimerase (GALE) interconverts UDP-galactose and UDP-glucose, thereby completing the pathway.[8] from here: http://en.wikipedia.org/wiki/Galactose

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