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Kaplan Qbank USMLE



Author13 Posts
  #1

Enzyme Glucose 6 phosphate phosphatase located in the cells
  1. mitochondria
  2. ER
  3. Nucleus
  4. cytoplasm
  5. ribosome


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  #2

4.cytoplasm

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  #3

ER

  #4

4- cytosol

  #5

i am sure its in ER.

  #6

Cytosol

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  #7

Correct answer is ER

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FA is just a good revision book.It is not a "real" learning tool.

  #8

the answer is cytoplasm. this is an enzyme in gluconeogenesis.OAA that is syntesised in the mitochondria enters cytoplasm through malate shuttle and through series of steps form glucose in the cytoplasm

  #9

Buddy can u Explain ur answer which enzyme r u talking abt G6PD or G6P ??




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  #10

This Enzyme is specifically related to Type Ia Von Gierke's disease this enzyme is in the ER. Type I glycogen storage disease is attributed to lack of glucose-6-phosphatase. However, this enzyme is localized on the cisternal surface of the endoplasmic reticulum (ER); in order to gain access to the phosphatase, glucose-6-phosphate must pass through a specific translocase in the ER membrane. Mutation of either the phosphatase or the translocase makes transfer of liver glycogen to the blood a very limited process. Thus, mutation of either gene leads to symptoms associated with von Gierke's disease, which occurs at a rate of about 1 in 200,000 people.

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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."

  #11

yes agreed ER on tissue need ---signalling---er--->g6p. normally we dont find it in cytoplasm...!

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  #12

yup.. G6Pase is definitely in ER.. n deficient in von gierke's

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  #13

the pathway of gluconeogenesis simplified is this.. (Thanks to nnl)

OAA via malate shuttle-----> cytoplasm
OAA in cytoplasm----->Phosphoenolpyruvate via PEPCK
Reversal of glycolysis n fructose 1,6 bis Phosphatase ------> Glucose 6 phosphate in cytoplasm.
Glucose 6 phosphate-------> ER via translocase
Inside ER, gucose 6 Pase acts on it -------> Glucose

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