| Molecular cloning of human ornithine aminotransferase mRNA. | |
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MedLine Citation:
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PMID: 3456579 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The isolation and characterization of a cDNA clone for the mRNA of human ornithine aminotransferase (OATase; ornithine-oxo-acid aminotransferase; L-ornithine:2-oxo-acid aminotransferase, EC 2.6.1.13), a nonabundant mitochondrial matrix enzyme that is severely deficient in a hereditary chorioretinal degenerative disease (gyrate atrophy), is described. Human liver, retina, and retinoblastoma (Y79) mRNAs were prepared and tested for the OATase mRNA content by in vitro translation, immunoprecipitation, and NaDodSO4/PAGE. The retinoblastoma cells were found to be expressing this enzyme at a relatively high level. The primary translation product of the OATase mRNA is larger than the pure OATase protein on NaDodSO4/PAGE by approximately equal to 4 kDa, suggesting a precursor protein. lambda gt11 cDNA libraries were prepared from the human mRNAs, and the recombinant clones were immunoscreened as plaques with two different preparations of rabbit anti-human OATase antibodies. A clone (lambda gtRB315) was isolated from the retinoblastoma library that reacts with both of the antibody preparations, and the DNA sequence of its 2.1-kilobase-pair cDNA insert was obtained. An open reading frame consisting of 1371 nucleotides is present in the sequence, and a putative translational initiation methionine codon is identified at position 55. A putative leader sequence consisting of 32 amino acid residues is identified, resulting in a precursor protein of 439 amino acid residues and a molecular mass of 48,534 Da and a mature protein of 407 residues and 45,136 Da. The amino acid sequences of seven tryptic peptides (115 amino acid residues) of the pure human OATase were obtained by microsequencing. When the tryptic peptide and cDNA-derived amino acid sequences were compared, homologies in 111 of 115 residues, including a match of 20 consecutive residues, were observed. An RNA blot hybridization of 32P-labeled OATase cDNA to normal human retina and retinoblastoma mRNAs demonstrated an OATase mRNA species of approximately equal to 2.2 kilobases. The level of OATase mRNA in the normal human retina is approximately equal to 1/100th the level of rhodopsin mRNA and 1/5th to 1/10th the level present in the retinoblastoma cells. |
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Authors:
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G Inana; S Totsuka; M Redmond; T Dougherty; J Nagle; T Shiono; T Ohura; E Kominami; N Katunuma |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 83 ISSN: 0027-8424 ISO Abbreviation: Proc. Natl. Acad. Sci. U.S.A. Publication Date: 1986 Mar |
Date Detail:
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Created Date: 1986-04-10 Completed Date: 1986-04-10 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 7505876 Medline TA: Proc Natl Acad Sci U S A Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1203-7 Citation Subset: IM |
| Data Bank Information | |
Bank Name/Acc. No.:
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GENBANK/M12267 |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amino Acid Sequence Base Sequence Cloning, Molecular DNA / genetics Eye Diseases / enzymology, genetics* Humans Ornithine-Oxo-Acid Transaminase / genetics* RNA, Messenger / genetics Transaminases / genetics* |
| Chemical | |
Reg. No./Substance:
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0/RNA, Messenger; 9007-49-2/DNA; EC 2.6.1.-/Transaminases; EC 2.6.1.13/Ornithine-Oxo-Acid Transaminase |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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