title: Ribosomal protein S6 from Xenopus laevis ovaries. Isolation, phosphorylation in vivo and cross-reaction with heterologous anti-S6 antibodies.
abstract: Ribosomal protein S6 from Xenopus laevis ovaries was prepared by ion-exchange chromatography on phosphocellulose and gel filtration on Sephadex G-75. The protein was identified as S6 from its position on two-dimensional polyacrylamide gels and from its immunological cross-reaction with monoclonal antibody raised against chicken liver S6, and from the fact that it is the major phosphorylated protein of the small subunit. When oocytes were incubated with [32P]orthophosphate in the presence of progesterone, 32P incorporation of 40-S ribosomal proteins was stimulated about 10-fold over controls without hormone. The bulk of the 32P radioactivity was incorporated into protein S6.
mesh_terms: D000818:Animals; D000906:Antibodies; D003429:Cross Reactions; D005260:Female; D010053:Ovary / Q000378:metabolism*; D010766:Phosphorylation; D038601:Ribosomal Protein S6; D012269:Ribosomal Proteins / Q000276:immunology / Q000302:isolation & purification*; D014982:Xenopus laevis / Q000378:metabolism
chemical_list: D000906:Antibodies; D038601:Ribosomal Protein S6; D012269:Ribosomal Proteins