Cloning and functional analysis of the arginyl-tRNA-protein transferase gene ATE1 of Saccharomyces cerevisiae.
Aminoacyl-tRNA-protein transferases (Arg-transferases) catalyze post-translational conjugation of specific amino acids to the amino termini of acceptor proteins. A function of these enzymes in eukaryotes has been shown to involve the conjugation of destabilizing amino acids to the amino termini of short-lived proteins, these reactions being a part of the N-end rule pathway of protein degradation (Gonda, D. K., Bachmair, A., Wünning, I., Tobias, J. W., Lane, W. S., and Varshavsky, A. (1989) J. Biol. Chem. 264, 16700-16712). We have cloned the ATE1 gene of the yeast Saccharomyces cerevisiae which encodes arginyl-tRNA-protein transferase. ATE1 gives rise to a approximately 1.6-kilobase mRNA and codes for a 503-residue protein. Expression of the yeast ATE1 gene in Escherichia coli, which lacks Arg-transferases, was used to show that the ATE1 protein possesses the Arg-transferase activity. Null ate1 mutants are viable but lack the Arg-transferase activity and are unable to degrade those substrates of the N-end rule pathway that start with residues recognized by the Arg-transferase.
Balzi
E
E
Laboratoire d'Enzymologie, Université Catholique de Louvain, Belgium.
Choder
M
M
Chen
W N
WN
Varshavsky
A
A
Goffeau
A
A
D000217:Acyltransferases / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D019881:Aminoacyltransferases; D001483:Base Sequence; D003001:Cloning, Molecular; D003360:Cosmids; D004926:Escherichia coli / Q000235:genetics; D015870:Gene Expression; D005800:Genes, Fungal; D007700:Kinetics; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000378:metabolism; D015183:Restriction Mapping; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics*
D011994:Recombinant Proteins; D000217:Acyltransferases; D019881:Aminoacyltransferases; C019727:arginyltransferase