Structural characterization of the early indoleacetic acid-inducible genes, PS-IAA4/5 and PS-IAA6, of pea (Pisum sativum L.)

J Mol Biol. 1993 Oct 20;233(4):789-98. doi: 10.1006/jmbi.1993.1555.


Two early auxin-inducible genes (PS-IAA4/5 and PSIAA6) from pea were cloned using previously isolated complementary DNA sequences. They are present in single copy per haploid genome, and are members of a large divergent multigene family that encodes similar proteins. The genes were structurally characterized and sequence analysis of their 5'-flanking regions revealed the presence of several highly conserved sequences found in various auxin-regulated genes from other plant species. Their coding regions are interrupted by three and two introns, respectively. Introns two and three of PS-IAA4/5 and introns one and two of PS-IAA6 are located in identical positions. These genes encode proteins of 189 (21,036 Da) and 179 (20,330 Da) residues that are 46% identical. They also share a significant degree of identity (42 to 80%) with other proteins encoded by auxin regulated genes in soybean, mungbean and Arabidopsis thaliana. All proteins contain four conserved domains ranging in size from 9 to 43 amino acids. Their most prominent feature is the presence of a highly charged N terminus consisting of two clusters of acidic residues separated by a cluster of basic amino acids.

Publication types

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

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • Blotting, Southern
  • Cloning, Molecular
  • DNA
  • Fabaceae / genetics*
  • Gene Expression Regulation*
  • Genes, Plant*
  • Indoleacetic Acids / pharmacology*
  • Introns
  • Molecular Sequence Data
  • Plant Proteins / genetics*
  • Plants, Medicinal*
  • Restriction Mapping
  • Sequence Homology, Amino Acid


  • Indoleacetic Acids
  • Plant Proteins
  • DNA

Associated data

  • GENBANK/X68215
  • GENBANK/X68216
  • GENBANK/X68217
  • GENBANK/X68218