The slow step of folding of Staphylococcus aureus PC1 β-lactamase involves the collapse of a surface loop rate limited by the Trans to Cis isomerization of a non-proline peptide bond
✍ Scribed by Kerry A. Wheeler; Alastair R. Hawkins; Roger Pain; Richard Virden
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 122 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0887-3585
No coin nor oath required. For personal study only.
✦ Synopsis
We wished to test the hypothesis that the non proline cis to trans isomerization of the peptide bond at position 167 in the S. aureus -lactamase PC1 exerts a significant controlling effect on the folding pathway of this enzyme. The previous data presented in support of this hypothesis could not rule out the effect of factors unrelated to non-proline cis/trans isomerization. We have used the plasmid pET9d to direct soluble overproduction of the S. aureus -lactamase PC1 and a sitedirected mutant (Ile 167 to Pro) in Escherichia coli. Following purification the proteins were subjected to a comparative analysis of the kinetics of unfolding and refolding using the techniques of near-and far-UV circular dichroism spectroscopy and fluorescence spectroscopy in conjunction with ''double-jump'' experiments. Results show that the fully-unfolded I167P mutant enzyme retains 20% of molecules in a fast-refolding form and that slower-refolding molecules fold faster than the recombinant wild-type enzyme. The final stage of folding involves folding of the ⍀-loop into a conformation essential for enzymatic activity. In support of the original hypothesis, the folding of this ⍀-loop is rate limited by the isomerization of the Glu 166-Ile 167 peptide bond. Proteins