Open AccessIsolation and characterization of IDI2, a new Fe‐deficiency‐induced cDNA from barley roots, which encodes a protein related to the α subunit of eukaryotic initiation factor 2B (eIF2Bα)
Author(s) -
Haruhisa Yamaguchi,
Hiromi Nakanishi,
Naoko K. Nishizawa,
Satoshi Mori
Publication year - 2000
Publication title -
journal of experimental botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.616
H-Index - 242
eISSN - 1460-2431
pISSN - 0022-0957
DOI - 10.1093/jexbot/51.353.2001
Subject(s) - complementary dna , protein subunit , biology , archaea , protein family , gene , cdna library , genetics , eif4a1 , microbiology and biotechnology , messenger rna , translation (biology)
A new Fe-deficiency-inducible cDNA, IDI2, was isolated from Fe-deficient barley roots using the cDNA MACRO Array Technique. Accumulation of IDI2 transcripts in barley roots was strongly correlated with iron nutritional status. IDI2 encoded a protein with a low similarity to the alpha subunit of eukaryotic initiation factor 2B (eIF2Balpha). In addition, many hypothetical proteins homologous to IDI2 were also found in a database search. These proteins had limited similarity to eIF2Balpha as well as IDI2. It has been reported that these eIF2Balpha-like proteins (eIF2Balpha-LPs) are a family that is distinct from the eIF2Balpha/beta/delta family and widely distributed in the archaea, bacteria, and eukarya. A phylogenic analysis revealed that IDI2 is the first member of the eIF2Balpha-LP family to be found in higher plants. A possible role of IDI2 protein in regulating protein synthesis in Fe-deficient barley roots is proposed.