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PMID: 1898367 Published · ppublish English Comparative Study Journal Article Research Support, Non-U.S. Gov't

Evidence that gene G7a in the human major histocompatibility complex encodes valyl-tRNA synthetase.

The Biochemical journal ·Vol. 278 ( Pt 3) ·1991-09-15 ·Pages 809-16

Hsieh SL, Campbell RD

Abstract

At least 36 genes have now been located in a 680 kb segment of DNA between the class I and class II multigene families within the class III region of the human major histocompatibility complex on chromosome 6p21.3. The complete nucleotide sequence of the 4.3 kb mRNA of one of these genes, G7a (or BAT6), has been determined from cDNA and genomic clones. The single-copy G7a gene encodes a 1265-amino-acid protein of molecular mass 140,457 Da. Comparison of the derived amino acid sequence of the G7a protein with the National Biomedical Research Foundation protein databases revealed 42% identity in a 250-amino-acid overlap with Bacillus stearothermophilus valyl-tRNA synthetase, 38.0% identity in a 993-amino-acid overlap with Escherichia coli valyl-tRNA synthetase (val RS), and 48.3% identity in a 1043-amino-acid overlap with Saccharomyces cerevisiae valyl-tRNA synthetase. The protein sequence of G7a contains two short consensus sequences, His-Ile-Gly-His and Lys-Met-Ser-Lys-Ser, which is the typical signature structure of class I tRNA synthetases and indicative of the presence of the Rossman fold. In addition, the molecular mass of the G7a protein is the same as that of other mammalian valyl-tRNA synthetases. These features and the high sequence identity with yeast valyl-tRNA synthetase strongly support the fact that the G7a gene, located within the major histocompatibility complex, encodes the human valyl-tRNA synthetase.

MeSH Terms
Amino Acid Sequence Base Sequence Blotting, Southern DNA/genetics,isolation & purification Escherichia coli/enzymology Exons HLA Antigens/chemistry,genetics Humans Major Histocompatibility Complex/genetics Molecular Sequence Data Restriction Mapping Ribonucleases Saccharomyces cerevisiae/enzymology Sequence Homology, Nucleic Acid Valine-tRNA Ligase/chemistry,genetics
Chemicals
HLA Antigens VARS2 protein, human DNA Ribonucleases Valine-tRNA Ligase
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Hsieh S L
Department of Biochemistry, University of Oxford, U.K.
Campbell R D
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Article Info
Journal
The Biochemical journal
Abbr.
Biochem J
ISSN
0264-6021
DOI
10.1042/bj2780809
Published
1991-09-15
Pages
809-16
Language
English
Region
England
NLM ID
2984726R
PMCID
PMC1151418
Subset
IM
Databases
GENBANK
M64055, M64056, M64057, M64058, M64059, M64060, S67100, X59303, X59591, X59592
Corrections
ErratumIn
-
External Links
PubMed source DOI: 10.1042/bj2780809 PMC Full Text View journal details
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