Identification and characterization of cDNA clones encoding plant calreticulin in barley.

TitleIdentification and characterization of cDNA clones encoding plant calreticulin in barley.
Publication TypeJournal Article
Year of Publication1994
AuthorsChen F, Hayes PM, Mulrooney DM, Pan A
JournalThe Plant cell
Volume6
Issue6
Pagination835-43
Date Published1994 Jun
ISSN1040-4651
KeywordsAmino Acid Sequence, Binding Sites, Calcium, Calcium-Binding Proteins, Calreticulin, Cloning, Molecular, DNA, Complementary, Gene Expression Regulation, Hordeum, Molecular Sequence Data, Pollen, Polymorphism, Restriction Fragment Length, Recombinant Proteins, Ribonucleoproteins, Sequence Homology, Amino Acid
Abstract

Two cDNA clones (CRH1 and CRH2) homologous to animal calreticulin, a major calcium storage protein in the lumen of the endoplasmic reticulum, were isolated from an ovary cDNA library of barley through differential screening. The two clones differ in the 3' untranslated region and the 5' region that encodes a putative N-terminal signal sequence. CRH1 was mapped to the minus arm of chromosome 1. CRH2 was mapped to the minus arm of chromosome 2. The deduced amino acid sequences share 50 to 55% identity with animal calreticulins and exhibit the same three-zone characteristic. Recombinant protein stained blue with Stains-all and bound 45Ca2+ when transferred to nitrocellulose membranes. A native protein of approximately 55 kD was identified in ovary extract. Elevated gene expression was observed in ovaries 1 day after pollination and during early embryogenesis. CRH1 was expressed at a higher level than CRH2. These studies demonstrate the presence of calreticulin in plant cells and its developmental regulation in fertilization.

DOI10.1105/tpc.6.6.835
Alternate JournalPlant Cell