a) Which catalytic mechanism occurs in step 2? b) Why must phosphate first bind to succinyl-CoA before interacting with the His site and GDP?

Biochemistry
6th Edition
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Reginald H. Garrett, Charles M. Grisham
Chapter19: The Tricarboxylic Acid Cycle
Section: Chapter Questions
Problem 14P
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Succinyl-CoA Synthetase mechanism
Succinyl-CoA synthetase
enzyme active site
O Substrates bind
to the active site
COO
of succinyl-CoA
synthetase
CH2
OH
His
CH2
. Succinyl-CoA
COA-
Guanosine
Phosphoryl group
transfer to GDP to
form GTP, which is
released from the
2 Formation of
succinyl-phosphate
COA
GTP
enzyme
Formation of
phosphohistidine
Guanosine
COO
Phosphohistidine
CH2
GDP
GDP
CH2
COO
CH2
| "Succinate
CH,
Succinyl-phosphate
ČOO
a) Which catalytic mechanism occurs in step 2?
b) Why must phosphate first bind to succinyl-CoA before interacting with the His site and GDP?
Transcribed Image Text:Succinyl-CoA Synthetase mechanism Succinyl-CoA synthetase enzyme active site O Substrates bind to the active site COO of succinyl-CoA synthetase CH2 OH His CH2 . Succinyl-CoA COA- Guanosine Phosphoryl group transfer to GDP to form GTP, which is released from the 2 Formation of succinyl-phosphate COA GTP enzyme Formation of phosphohistidine Guanosine COO Phosphohistidine CH2 GDP GDP CH2 COO CH2 | "Succinate CH, Succinyl-phosphate ČOO a) Which catalytic mechanism occurs in step 2? b) Why must phosphate first bind to succinyl-CoA before interacting with the His site and GDP?
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