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Structure-function relationships in Escherichia coli adenylate cyclase.

Jürgen U Linder1

  • 1Department of Pharmacology, Weill Medical College of Cornell University, 1300 York Avenue, New York, NY 10065, USA. jul2015@med.cornell.edu

The Biochemical Journal
|July 16, 2008
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Summary

Class I adenylate cyclases are crucial for bacterial processes. This study identifies key catalytic residues in E. coli adenylate cyclase, revealing a two-metal-ion mechanism and substrate binding roles.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Class I adenylate cyclases are vital enzymes in gamma- and delta-proteobacteria.
  • These enzymes regulate critical cellular functions, including catabolite repression and virulence.
  • Understanding their catalytic mechanisms is essential for deciphering bacterial physiology and pathogenesis.

Purpose of the Study:

  • To elucidate the catalytic mechanism and substrate interactions of Class I adenylate cyclases.
  • To identify and characterize essential residues involved in the catalysis of Escherichia coli adenylate cyclase.

Main Methods:

  • Overexpression and purification of the catalytic domain of E. coli adenylate cyclase.
  • Enzyme kinetics studies, including Vmax and Km determination.
  • Site-directed mutagenesis to identify essential catalytic residues.
  • Structural comparison with related enzymes within the nucleotidyltransferase superfamily.

Main Results:

  • The E. coli adenylate cyclase catalytic domain exhibited a Vmax of 665 nmol cAMP/mg/min and a Km of 270 microM.
  • A two-metal-ion mechanism was proposed, requiring free Mg2+ ions in addition to the MgATP complex.
  • Twelve essential catalytic residues were identified, with five (Ser103, Ser113, Asp114, Asp116, Trp118) located in a conserved nucleotidyltransferase region.
  • Asp114 and Asp116 were suggested as metal-cofactor-ion-binding residues, and Ser103 was implicated in ATP binding.

Conclusions:

  • The study provides mechanistic insights into Class I adenylate cyclase function.
  • Specific residues, particularly Ser103, Asp114, and Asp116, are critical for catalysis and substrate binding.
  • The findings highlight conserved catalytic strategies across the DNA polymerase beta-like nucleotidyltransferase superfamily.