Reengineering Rate-Limiting, Millisecond Enzyme Motions by Introduction of an Unnatural Amino Acid
Identifieur interne : 000057 ( Pmc/Curation ); précédent : 000056; suivant : 000058Reengineering Rate-Limiting, Millisecond Enzyme Motions by Introduction of an Unnatural Amino Acid
Auteurs : Eric D. Watt [États-Unis] ; Ivan Rivalta [États-Unis] ; Sean K. Whittier [États-Unis] ; Victor S. Batista [États-Unis] ; J. Patrick Loria [États-Unis]Source :
- Biophysical Journal [ 0006-3495 ] ; 2011.
Abstract
Rate-limiting millisecond motions in wild-type (WT) Ribonuclease A (RNase A) are modulated by histidine 48. Here, we incorporate an unnatural amino acid, thia-methylimidazole, at this site (H48C-4MI) to investigate the effects of a single residue on protein motions over multiple timescales and on enzyme catalytic turnover. Molecular dynamics simulations reveal that H48C-4MI retains some crucial WT-like hydrogen bonding interactions but the extent of protein-wide correlated motions in the nanosecond regime is decreased relative to WT. NMR Carr-Purcell-Meiboom-Gill relaxation dispersion experiments demonstrate that millisecond conformational motions in H48C-4MI are present over a similar pH range compared to WT. Furthermore, incorporation of this nonnatural amino acid allows retention of WT-like catalytic activity over the full pH range. These studies demonstrate that the complexity of the protein energy landscape during the catalytic cycle can be maintained using unnatural amino acids, which may prove useful in enzyme design efforts.
Url:
DOI: 10.1016/j.bpj.2011.05.039
PubMed: 21767494
PubMed Central: 3136797
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<front><div type="abstract" xml:lang="en"><p>Rate-limiting millisecond motions in wild-type (WT) Ribonuclease A (RNase A) are modulated by histidine 48. Here, we incorporate an unnatural amino acid, thia-methylimidazole, at this site (H48C-4MI) to investigate the effects of a single residue on protein motions over multiple timescales and on enzyme catalytic turnover. Molecular dynamics simulations reveal that H48C-4MI retains some crucial WT-like hydrogen bonding interactions but the extent of protein-wide correlated motions in the nanosecond regime is decreased relative to WT. NMR Carr-Purcell-Meiboom-Gill relaxation dispersion experiments demonstrate that millisecond conformational motions in H48C-4MI are present over a similar pH range compared to WT. Furthermore, incorporation of this nonnatural amino acid allows retention of WT-like catalytic activity over the full pH range. These studies demonstrate that the complexity of the protein energy landscape during the catalytic cycle can be maintained using unnatural amino acids, which may prove useful in enzyme design efforts.</p>
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<article-categories><subj-group subj-group-type="heading"><subject>Protein</subject>
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<contrib-group><contrib contrib-type="author"><name><surname>Watt</surname>
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<xref rid="aff1" ref-type="aff">†</xref>
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<xref rid="aff2" ref-type="aff">‡</xref>
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<email>patrick.loria@yale.edu</email>
<xref rid="aff1" ref-type="aff">†</xref>
<xref rid="aff2" ref-type="aff">‡</xref>
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<aff id="aff1"><label>†</label>
Department of Chemistry, Yale University, New Haven, Connecticut</aff>
<aff id="aff2"><label>‡</label>
Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut</aff>
<author-notes><corresp id="cor1"><label>∗</label>
Corresponding author <email>patrick.loria@yale.edu</email>
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<month>3</month>
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<year>2011</year>
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<permissions><copyright-statement>© 2011 by the Biophysical Society.</copyright-statement>
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<copyright-holder>Biophysical Society</copyright-holder>
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<abstract><p>Rate-limiting millisecond motions in wild-type (WT) Ribonuclease A (RNase A) are modulated by histidine 48. Here, we incorporate an unnatural amino acid, thia-methylimidazole, at this site (H48C-4MI) to investigate the effects of a single residue on protein motions over multiple timescales and on enzyme catalytic turnover. Molecular dynamics simulations reveal that H48C-4MI retains some crucial WT-like hydrogen bonding interactions but the extent of protein-wide correlated motions in the nanosecond regime is decreased relative to WT. NMR Carr-Purcell-Meiboom-Gill relaxation dispersion experiments demonstrate that millisecond conformational motions in H48C-4MI are present over a similar pH range compared to WT. Furthermore, incorporation of this nonnatural amino acid allows retention of WT-like catalytic activity over the full pH range. These studies demonstrate that the complexity of the protein energy landscape during the catalytic cycle can be maintained using unnatural amino acids, which may prove useful in enzyme design efforts.</p>
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