Question

To get to its location in a eukaryotic cell, the gene coding for the enzyme phosphofructokinase ...


a) will include a nuclear localization signal.


b) will not include a signal sequence.


c) will include an ER signal sequence.


d) will include a mitochondrial signal sequence.​

Answer 1

To get to its location in a eukaryotic cell, the gene coding for the enzyme phosphofructokinase b) will not include a signal sequence.

Phosphofructokinase:

• A crucial regulatory step in the glycolytic system, fructose-6-phosphate's phosphorylation to fructose-1,6-bisphosphate is catalyzed by phosphofructokinase.
• The fact that ATP inhibits it allosterically and AMP activates it allosterically indicates that the cell needs the energy to complete the glycolytic pathway.
• Phosphofructokinase is a key enzyme in controlling the fermentation process, which converts one molecule of simple sugar glucose into two molecules of pyruvic acid.
• As glycolysis regulating enzyme, PFK is favorably controlled by ADP and negatively inhibited by ATP and citrate.
• When there is enough ATP available, ATP acts as an allosteric inhibitor for PFK, signaling that glycolysis need not continue.

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Answer 2

The phosphofructokinase b) gene will not have a signal sequence to guide it to its site in a eukaryotic cell.

Explanation:

• This enzyme catalyses fructose-6-phosphate's phosphorylation to fructose-1,6-bisphosphate, which is a critical regulatory step in the glycolytic pathway.
• It is clear that the cell needs the energy to finish the glycolytic pathway because ATP inhibits it allosterically and AMP activates it.
• A crucial enzyme in regulating fermentation is phosphofructokinase, which turns one molecule of the simple sugar glucose into two molecules of pyruvic acid.
• As an enzyme that controls glycolysis, PFK is negatively inhibited by ATP and citrate and positively controlled by ADP.
• When enough ATP is present, it functions as an allosteric inhibitor for PFK, signalling that glycolysis is not necessary to proceed.

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