How Does Penicillinase Affect Penicillin Kinetics in Staphylococcus Aureus?

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SUMMARY

The discussion focuses on the impact of penicillinase on penicillin kinetics in Staphylococcus aureus, specifically examining the enzyme's hydrolysis of penicillin. The enzyme, with a mass of 29.6 kDa, hydrolyzes penicillin in a 10 ml solution containing 10^-9 g of purified penicillinase. Data collected includes penicillin concentrations (1, 3, 5, 10, 30, 50 µM) and corresponding hydrolyzed amounts (0.11, 0.25, 0.34, 0.45, 0.58, 0.61 nM). The tasks involve plotting V0 vs [S], calculating KM, determining Vmax, and finding the turnover number of penicillinase.

PREREQUISITES
  • Understanding of enzyme kinetics, specifically Michaelis-Menten kinetics
  • Familiarity with plotting data and interpreting graphs
  • Knowledge of the significance of Vmax and KM in enzyme activity
  • Basic biochemistry concepts related to enzyme-substrate interactions
NEXT STEPS
  • Learn how to plot Michaelis-Menten curves using experimental data
  • Study the calculation of KM and Vmax from enzyme kinetics data
  • Explore the concept of turnover number in enzyme catalysis
  • Investigate the role of penicillinase in antibiotic resistance mechanisms
USEFUL FOR

Students in biochemistry, microbiologists studying antibiotic resistance, and researchers focusing on enzyme kinetics and pharmacology.

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Homework Statement


Penicilline is hydrolyzed and thereby rendered inactive by penicillinase , an enzyme present in some resistant bacteria. The mass of this enzyme in staphylococcus aureus is 29.6kd. The amount of penicilline hydrolysed in 1 minute in a 10ml solution containing 10^-9g of purified penicillinase was measured as a function of the concentration of penicillin. assume that the concentration of penicillin does not change appreciably during the assay.The following data was collected: Penicillin in micro mole:1, 3, 5, 10, 30, 50 and amount hydrlysed in nanomole: 0.11, 0.25, 0.34, 0.45, 0.58, 0.61 respectively.
1. plot V0 vs and 1/V0 vs 1/ for these data and find the value of KM
2. what is the value of Vmax
3. What is the turnover number of penicillinase under the experimental conditions. Assume one active site per enzyme molecule.


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