Nucleotide sequence analysis of purH and purD genes from Salmonella typhimurium

Ashok Kumar Chopra, Johnny Wayne Peterson, Rajendra Prasad

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


The purH and purD genes coding for the 5′-phosphoribosyl 5-amino-imidazole-4-carboxamide (AICAR) transformylase and 5′-phosphoribosyl-glycinamide (GAR) synthetase, respectively, were identified on a 4.8 kb EcoRI fragment of chromosomal DNA from Salmonella typhimurium. Nucleotide sequence analysis of the cloned fragment revealed the presence of two large open reading frames (O.R.F.), which were separated by 11 base pairs (bp). Substantial DNA and amino acid sequence homology was noted between the purH and purD genes of S. typhimurium and Escherichia coli. Expression of the Salmonella purD gene in a T7 polymerase/promoter system revealed the presence of a 49 kDa protein band by SDS-PAGE and subsequent autoradiography. The purH gene of Salmonella was not expressed since the 5′ end of this gene was not cloned.

Original languageEnglish (US)
Pages (from-to)351-354
Number of pages4
JournalBBA - Gene Structure and Expression
Issue number3
StatePublished - Nov 11 1991


  • DNA sequencing
  • T7 polymerase/promoter system
  • purH and purD genes

ASJC Scopus subject areas

  • Structural Biology
  • Biophysics
  • Biochemistry
  • Genetics


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