The 3'-terminal region of the hygromycin-B-resistance gene is important for its activity in Escherichia coli and Nicotiana tabacum

Gene. 1991 Apr;100:247-50. doi: 10.1016/0378-1119(91)90375-l.


We have modified the 3'-coding region of the hygromycin B (Hy) phosphotransferase-encoding gene (hph). The level of Hy resistance conferred by the modified hph genes was determined in Escherichia coli and Nicotiana tabacum. Polypeptides up to 12 amino acids shorter or longer than the wild-type (wt) protein remained active in both pro- and eukaryotic cells. A gene construct of wt length, but with a modified 3' sequence, was less active as measured by the level of Hy resistance. Therefore, the nature of the C terminus of the hph gene product, rather than the length of the polypeptide, influences the ability to confer resistance to Hy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • Drug Resistance / genetics
  • Drug Resistance, Microbial / genetics
  • Escherichia coli / enzymology
  • Escherichia coli / genetics*
  • Hygromycin B / pharmacology*
  • Molecular Sequence Data
  • Oligonucleotide Probes
  • Phosphotransferases (Alcohol Group Acceptor)*
  • Phosphotransferases / genetics*
  • Plants, Toxic*
  • Plasmids
  • Tobacco / enzymology
  • Tobacco / genetics*


  • Oligonucleotide Probes
  • Hygromycin B
  • Phosphotransferases
  • Phosphotransferases (Alcohol Group Acceptor)
  • hygromycin-B kinase