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J. Biol. Chem., Vol. 266, Issue 30, 20007-20010, Oct, 1991
K Suzuki, J Olvera and IG Wool
The amino acid sequence of the rat 40 S ribosomal subunit protein S2 was
deduced from the sequence of nucleotides in two recombinant cDNAs and
confirmed from the amino acid sequence of a cyanogen bromide peptide
obtained from the protein. Ribosomal protein S2 has 293 amino acids and has
a molecular weight of 31,211. Hybridization of the cDNA to digests of
nuclear DNA suggests that there are 23-28 copies of the S2 gene. The mRNA
for the protein is about 1,000 nucleotides in length. The highly conserved
repetitive mammalian gene family designated LLRep3, but not identified
before, encodes ribosomal protein S2. Rat S2 is related to Saccharomyces
cerevisiae S4, Methanococcus vannielii S5, Escherichia coli S5, and other
members of the prokaryotic S5 family. S. cerevisiae S4 and E. coli S5 are
involved in the binding of aminoacyl- tRNA to ribosomes and in conditioning
the fidelity of translation; it is plausible to assume that rat S2 serves
similar functions. The NH2- terminal region of S2 is rich in
arginine-glycine repeats including eight that occur in tandem and has two
consecutive copies of the motif RGGF; these sequences have been associated
with nucleolar localization and binding to RNA.
Primary structure of rat ribosomal protein S2. A ribosomal protein with arginine-glycine tandem repeats and RGGF motifs that are associated with nucleolar localization and binding to ribonucleic acids
Department of Biochemistry and Molecular Biology, University of Chicago, Illinois 60637.
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