title: An ATPase center of rat liver 30S-5SRNP particles.
abstract: Treatment of 30S-5SRNP with 1 M Cs(2)SO(4) at 2 degrees C overnight followed by sucrose density-gradient centrifugation yielded particles smaller than 30S-5SRNP, designated as CsS-particles. CsCl density-gradient centrifugation of CsS-particles showed the homogeneity of the particles containing about half the amount of proteins in 30S-5SRNP particles. The particles contained 18SrRNA, 5SRNP and about half the number of proteins in 30S-5SRNP. The ATPase activity of freshly prepared CsS-particles was about half the original 30S-5SRNP level although it was unstable even at 2 degrees C. Poly(U) slightly enhanced the activity, and phe-tRNA(phe) stimulated it concentration-dependently. EF-1a alone enhanced it, and in combination with poly(U) and phe-tRNA(phe) stimulated it markedly. EF-2 alone markedly increased it. The activity with the full components for elongation described above became very high, being comparable to that of the original 30S-5SRNP and twice that of 40S subunits. A two-dimensional electrophoretogram of the protein in CsS-particles revealed 9 small subunit protein species, in addition to L5, which included proteins interacting with mRNA and two elongation factors. Taken together with the results of our preceding study indicating the participation of ATPase of 80S ribosomes in peptide elongation, the present results indicate CsS-particles may be a part of the ATPase centre of 80S ribosomes.
authors.affiliation: Institute for Gene Expression, Dobashi Kyoritsu Hospital, Dobashi, Matsuyama, Ehime 790-0032, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ogata
authors.forename: R
authors.initials: R
authors.lastname: Ohno
authors.forename: K
authors.initials: K
authors.lastname: Terao
authors.forename: Y
authors.initials: Y
authors.lastname: Endo
mesh_terms: D000251:Adenosine Triphosphatases / Q000187:drug effects / Q000302:isolation & purification / Q000378:metabolism*; D000255:Adenosine Triphosphate / Q000494:pharmacology; D000818:Animals; D002499:Centrifugation, Density Gradient / Q000379:methods; D002586:Cesium / Q000737:chemistry; D002712:Chlorides / Q000737:chemistry; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D006160:Guanosine Triphosphate / Q000494:pharmacology; D008099:Liver / Q000201:enzymology*; D010445:Peptide Elongation Factors / Q000378:metabolism / Q000494:pharmacology; D014176:Protein Biosynthesis / Q000187:drug effects; D012313:RNA / Q000032:analysis; D051381:Rats; D012269:Ribosomal Proteins / Q000032:analysis / Q000302:isolation & purification* / Q000378:metabolism; D012270:Ribosomes / Q000378:metabolism; D013395:Sucrose / Q000737:chemistry
chemical_list: D002712:Chlorides; D010445:Peptide Elongation Factors; D012269:Ribosomal Proteins; C029742:ribosomal protein L5; C040469:ribosomal protein S30; C030831:ribosomal protein S5; D002586:Cesium; D013395:Sucrose; D012313:RNA; D006160:Guanosine Triphosphate; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases; C028019:cesium chloride