1. You have a glucose molecule that is radiolabeled at carbon 5. a). Indicate which carbon(s) in pyruvate would be radiolabeled: b). If pyruvate is converted to oxaloacetate through pyruvate carboxylase, indicate the labeling pattern on the CH,OH H H. OH H но H3C- -coo он first isocitrate produced. CH2 HC -coo HO-CH čoo c). Indicate the labeling pattern and distribution in oxaloacetate at the end of this turn of the TCA cycle.: Coo CH2

Introduction to General, Organic and Biochemistry
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Chapter23: Enzymes
Section: Chapter Questions
Problem 23.12P
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1. You have a glucose molecule that is radiolabeled at carbon 5.
a). Indicate which carbon(s) in pyruvate would be radiolabeled:
b). If pyruvate is converted to oxaloacetate through pyruvate carboxylase, indicate the labeling pattern on the
CH,OH
H
H.
OH H
но
H3C-
-coo
он
first isocitrate produced.
ÇoO
CH2
HÇ
-Co
HO-CH
c). Indicate the labeling pattern and distribution in oxaloacetate at the end of this
turn of the TCA cycle.:
čoo
Coo
CH2
d). What turn of the TCA cycle would label start to be lost as CO; (1 turn has been completed) ?
e). Which carbon in pyruvate would have been labeled to give you the labeling pattern in part c, if that pyruvate
went through PDH and the TCA cycle, instead of pyruvate carboxylase.
H3C
-co
f). How is the label in part c physically distributed on actual oxaloacetate molecules?
Transcribed Image Text:1. You have a glucose molecule that is radiolabeled at carbon 5. a). Indicate which carbon(s) in pyruvate would be radiolabeled: b). If pyruvate is converted to oxaloacetate through pyruvate carboxylase, indicate the labeling pattern on the CH,OH H H. OH H но H3C- -coo он first isocitrate produced. ÇoO CH2 HÇ -Co HO-CH c). Indicate the labeling pattern and distribution in oxaloacetate at the end of this turn of the TCA cycle.: čoo Coo CH2 d). What turn of the TCA cycle would label start to be lost as CO; (1 turn has been completed) ? e). Which carbon in pyruvate would have been labeled to give you the labeling pattern in part c, if that pyruvate went through PDH and the TCA cycle, instead of pyruvate carboxylase. H3C -co f). How is the label in part c physically distributed on actual oxaloacetate molecules?
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