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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Shorrosh, B. S. Dixon, R. A. |
| Description | Author Affiliation: Shorrosh BS ( Plant Biology Division, Samuel Roberts Noble Foundation, Ardmore, OK 73402.); |
| Abstract | cDNA clones containing sequence similarity to the multifunctional vertebrate protein disulfide-isomerase (PDI, EC 5.3.4.1) were isolated from an alfalfa (Medicago sativa L.) cDNA library by screening with a cDNA sequence encoding human PDI. The polypeptide encoded by a clone designated B2 consisted of 512 amino acids and was characterized by a 24-amino acid hydrophobic leader sequence, two regions with absolute identity to the vertebrate PDI active site (Ala-Pro-Trp-Cys-Gly-His-Cys-Lys), and a C-terminal endoplasmic reticulum retention signal (Lys-Asp-Glu-Leu). The overall identity of the B2 sequence to that of human PDI was 35% at the amino acid level (79% when conservative substitutions were included) and 39% at the nucleotide level; this included homology between B2 and the region of human PDI believed to be involved in binding estrogens. The deduced amino acid sequence of B2 was also 35% identical to that of a rat form I phosphatidylinositol-specific phospholipase C. Lysates from Escherichia coli cells harboring an expression plasmid bearing the B2 sequence contained significantly elevated levels of PDI activity. Southern analysis indicated the presence of a small PDI-related gene family in alfalfa, of which B2 appeared to correspond to a single gene. An approximately 2-kilobase B2 transcript was expressed in all alfalfa organs tested. In alfalfa cell suspension cultures, B2 transcripts were strongly induced by tunicamycin but not by exposure to fungal elicitor. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 23 |
| Volume Number | 88 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1991-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Isomerases Genetics Medicago Sativa Membrane Proteins Phosphoric Diester Hydrolases Plant Proteins Amino Acid Sequence Animals Binding Sites Cells, Cultured Cloning, Molecular DNA Isolation & Purification Escherichia Coli Gene Library Macromolecular Substances Enzymology Molecular Sequence Data Oligodeoxyribonucleotides Phosphatidylinositol Diacylglycerol-Lyase Phosphoinositide Phospholipase C Protein Disulfide-Isomerases RNA Restriction Mapping Sequence Homology, Nucleic Acid Transcription, Genetic Vertebrates Comparative Study Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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