title: A pea chloroplast translation elongation factor that is regulated by abiotic factors.
abstract: We report the cloning and characterization of both the cDNA (tufA) and genomic clones encoding for a chloroplast translation elongation factor (EF-Tu) from pea. The analysis of the deduced amino acids of the cDNA clone reveals the presence of putative transit peptide sequence and four GTP binding domains and two EF-Tu signature motifs in the mature polypeptide region. Using in vivo immunostaining followed by confocal microscopy pea EF-Tu was localized to chloroplast. The steady state transcript level of pea tufA was high in leaves and not detectable in roots. The expression of this gene is stimulated by light. The differential expression of this gene in response to various abiotic stresses showed that it is down-regulated in response to salinity and ABA and up-regulated in response to low temperature and salicylic acid treatment. These results indicate that regulation of pea tufA may have an important role in plant adaptation to environmental stresses.
authors.affiliation: International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110 067, India.
authors.forename: B N
authors.initials: BN
authors.lastname: Singh
authors.forename: R N
authors.initials: RN
authors.lastname: Mishra
authors.forename: Pradeep K
authors.initials: PK
authors.lastname: Agarwal
authors.forename: Mamta
authors.initials: M
authors.lastname: Goswami
authors.forename: Suresh
authors.initials: S
authors.lastname: Nair
authors.forename: S K
authors.initials: SK
authors.lastname: Sopory
authors.forename: M K
authors.initials: MK
authors.lastname: Reddy
mesh_terms: D001483:Base Sequence; D002736:Chloroplasts / Q000378:metabolism*; D003001:Cloning, Molecular; D018076:DNA, Complementary; D008969:Molecular Sequence Data; D018532:Pisum sativum / Q000378:metabolism*; D010444:Peptide Elongation Factor Tu / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid
chemical_list: D018076:DNA, Complementary; D011994:Recombinant Proteins; D010444:Peptide Elongation Factor Tu