Regulation of gene expression and cellular localization of cloned Klebsiella aerogenes (K. pneumoniae) urease

J Gen Microbiol. 1989 Jun;135(6):1769-76. doi: 10.1099/00221287-135-6-1769.


The genes for Klebsiella aerogenes (K. pneumoniae) urease were cloned and the protein was overexpressed (up to 18% of total protein consisted of this enzyme) in several hosts. The small size of the DNA encoding urease (3.5 kb), the restriction map, and the regulation of enzyme expression directed by the recombinant plasmid are distinct from other cloned ureases. Nickel concentration did not affect urease gene expression, as demonstrated by the high levels of apoenzyme measured in cells grown in nickel-free media. However, nickel was required for urease activity. The overproducing recombinant strain was used for immunogold electron microscopic localization studies to demonstrate that urease is a cytoplasmic enzyme.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Bacterial Proteins / biosynthesis
  • Bacterial Proteins / genetics*
  • Cloning, Molecular
  • Enzyme Activation / drug effects
  • Enzyme Induction
  • Gene Expression Regulation, Bacterial* / drug effects
  • Genes, Bacterial*
  • Immunohistochemistry
  • Klebsiella pneumoniae / genetics*
  • Nickel / pharmacology
  • Recombinant Fusion Proteins / biosynthesis
  • Urease / biosynthesis
  • Urease / genetics*


  • Bacterial Proteins
  • Recombinant Fusion Proteins
  • Nickel
  • Urease