Homology cloning of GTP-cyclohydrolase I from various unrelated eukaryotes by reverse-transcription polymerase chain reaction using a general set of degenerate primers

Biochem Biophys Res Commun. 1995 Jul 17;212(2):705-11. doi: 10.1006/bbrc.1995.2026.


GTP-cyclohydrolase I is the primary enzyme of tetrahydrobiopterin and folic acid biosynthesis. cDNA fragments of GTP-cyclohydrolase I were obtained from rainbow trout, chicken, the fungi Neurospora crassa, Phycomyces blakesleeanus and Saccharomyces cerevisiae, the cellular slime mold Dictyostelium discoideum, the phytoflagellate Euglena gracilis and the higher plant Mucuna hassjo using primers specific for conserved regions of the open reading frame and the reverse transcription polymerase chain reaction (RT-PCR) technique. A number of regions were found to be strictly conserved between unrelated eukaryotes. These regions may be essential for the function of GTP-cyclohydrolase I and are discussed with respect to the recently resolved crystal structure of the Escherichia coli enzyme.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Chickens / genetics
  • Cloning, Molecular*
  • DNA Primers
  • Dictyostelium / genetics
  • Euglena / genetics
  • Fabaceae / genetics
  • GTP Cyclohydrolase / chemistry
  • GTP Cyclohydrolase / genetics*
  • Molecular Sequence Data
  • Neurospora crassa / genetics
  • Oncorhynchus mykiss / genetics
  • Phycomyces / genetics
  • Plants, Medicinal
  • Polymerase Chain Reaction*
  • RNA-Directed DNA Polymerase*
  • Saccharomyces cerevisiae / genetics
  • Sequence Homology


  • DNA Primers
  • RNA-Directed DNA Polymerase
  • GTP Cyclohydrolase

Associated data

  • GENBANK/Z49267
  • GENBANK/Z49756
  • GENBANK/Z49757
  • GENBANK/Z49758
  • GENBANK/Z49759
  • GENBANK/Z49760