Certain proteins in a bacterial cell are short-lived and are labeled with a leucine, phenylalanine, tryptophan, or tyrosine at the N-terminal end. These proteins are degraded by
A) GroEL and GroES.
B) DnaK and DnaJ.
C) clpAP protease.
D) Sec A.
E) ubiquitin.

Question

Quizplus · Accepted Answer

The clpAP protease is responsible for the degradation of short-lived proteins labeled with leucine, phenylalanine, tryptophan, or tyrosine at the N-terminal end.

Answer A (GroEL and GroES) and B (DnaK and DnaJ) are chaperone proteins involved in protein folding and refolding, but not degradation.

Answer D (Sec A) is a protein that functions in the secretion and translocation of proteins across the bacterial membrane, but not in protein degradation.

Answer E (ubiquitin) is a protein involved in the tagging and degradation of proteins in eukaryotic cells, not bacterial cells.

Certain Proteins in a Bacterial Cell Are Short-Lived and Are