Subtilisin is a protease that is often added to laundry detergents to help remove protein-based stains like blood and egg. To characterize subtilisin in the lab, the model substrate Ala-Ala-Pro-Phe-p- nitroanilide (AAPF-pNA) is often used. The KM for this substrate is 1.8 mM. At a substrate concentration of 400 μM, the observed vo is 9.6 µM s²¹. The enzyme concentration is 1 µM. Calculate the kcat for this enzyme. Provide your answer in units of s-¹. Kcat S-1

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Subtilisin is a protease that is often added to laundry detergents to help remove protein-based stains
like blood and egg. To characterize subtilisin in the lab, the model substrate Ala-Ala-Pro-Phe-p-
nitroanilide (AAPF-pNA) is often used. The KM for this substrate is 1.8 mM. At a substrate
concentration of 400 μM, the observed vois 9.6 µM s´¹. The enzyme concentration is 1 µM.
Calculate the kcat for this enzyme. Provide your answer in units of s¹.
Kcat
=
s-1
A reversible inhibitor of subtilisin, the Streptomyces subtilisin inhibitor (SSI), is added to the reaction at
a concentration of 0.003 µM. Under these conditions, Vmax is unchanged, but the apparent KM
increases from 1.8 mM to 7.2 mM.
Calculate the K₁ for this inhibitor. Provide your answer in units of μM.
K₁ =
Transcribed Image Text:Subtilisin is a protease that is often added to laundry detergents to help remove protein-based stains like blood and egg. To characterize subtilisin in the lab, the model substrate Ala-Ala-Pro-Phe-p- nitroanilide (AAPF-pNA) is often used. The KM for this substrate is 1.8 mM. At a substrate concentration of 400 μM, the observed vois 9.6 µM s´¹. The enzyme concentration is 1 µM. Calculate the kcat for this enzyme. Provide your answer in units of s¹. Kcat = s-1 A reversible inhibitor of subtilisin, the Streptomyces subtilisin inhibitor (SSI), is added to the reaction at a concentration of 0.003 µM. Under these conditions, Vmax is unchanged, but the apparent KM increases from 1.8 mM to 7.2 mM. Calculate the K₁ for this inhibitor. Provide your answer in units of μM. K₁ =
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