Under physiological conditions, peptide bond formation requires coupling to GTP hydrolysis. Peptide bond degradation does not require GTP hydrolysis but does require a protease enzyme to proceed at physiologically relevant rates. Based on this information, under physiological conditions and in the absence of proteases, the peptide bonds that form during protein synthesis are:A.both thermodynamically and kinetically stable.B.thermodynamically unstable but kinetically stable.C.thermodynamically stable but kinetically unstable.D.both thermodynamically and kinetically unstable.
Question
Under physiological conditions, peptide bond formation requires coupling to GTP hydrolysis. Peptide bond degradation does not require GTP hydrolysis but does require a protease enzyme to proceed at physiologically relevant rates. Based on this information, under physiological conditions and in the absence of proteases, the peptide bonds that form during protein synthesis are:A.both thermodynamically and kinetically stable.B.thermodynamically unstable but kinetically stable.C.thermodynamically stable but kinetically unstable.D.both thermodynamically and kinetically unstable.
Solution
The peptide bonds that form during protein synthesis under physiological conditions and in the absence of proteases are thermodynamically unstable but kinetically stable. This is because, while the formation of peptide bonds is energetically favorable (hence, thermodynamically unstable), the rate at which they form is slow without the aid of enzymes to catalyze the reaction (hence, kinetically stable). Therefore, the correct answer is B. thermodynamically unstable but kinetically stable.
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