Determination of the number of proteins in liver ribosomes and ribosomal subunits by two-dimensional polyacrylamide gel electrophoresis.

نویسندگان

  • C C Sherton
  • I G Wool
چکیده

The number of proteins in rat liver ribosomes was determined by two-dimensional polyacrylamide gel electrophoresis. There were 30 proteins in the 40 S subunit, 39 in the 60 S subunit. The proteins of the two subunits, with one possible exception, are unique. Preparations of 80 S ribosomes contained three proteins not present in either subunit; thus, we estimate that eukaryotic ribosomes contain between 68 and 72 different proteins.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Evolutionary microdivergence of chick and rat liver ribosomal proteins.

We have set out to establish a nomenclature for ribosomal proteins which transcends, as far as is possible, the species from which the ribosomes were isolated. Initally, we identified individual proteins of rat liver by two-dimensional polyacrylamide gel electrophoresis and comparison with the classification system established by others (Sherton, C.C., and Wool, I.G. (1972) J. Biol. Chem. 247, ...

متن کامل

Accessibility of proteins in rat liver-free and membrane-bound ribosomes to lactoperoxidase-catalyzed iodination.

We have used lactoperoxidase-catalyzed iodination to study the topographical distribution of proteins in free and membrane-bound polysomes and in isolated ribosomal subunits. Free polysomes or rough microsomes were iodinated with 125I and then dissociated into 40 S and 60 S subunits by the use of puromycin/KCl. The separated subunits were iodinated with 13’1 and their protein composition analyz...

متن کامل

A Comparison of the Proteins of Rat Skeletal Muscle and Liver Ribosomes by Two-Dimensional Polyacrylamide Gel Electrophoresis OBSERVATIONS ON THE PARTITION OF PROTEINS BETWEEN RIBOSOJIAL SUBUNITS AND A DE- SCRIPTION OF TWO ACIDIC PROTEINS IN THE LARGE SUBUNIT*

We have determined the number of proteins in rat skeletal muscle 80 S ribosomes and ribosomal subparticles by twodimensional polyacrylamide gel electrophoresis. The proteins were compared with those from liver ribosomes. The small subunit of muscle ribosomes contained 31 proteins: it had two proteins (SJ and S,,,2) which were not found in liver 40 S particles; one protein (S31*) was always foun...

متن کامل

Relative Stoichiometry of Ribosomal Proteins in HeLa Cell Nucleoli

Total protein was released from isolated HeLa cell nucleoli by guanidine hydrochloride, purified by cesium chloride density gradient centrifugation, and analyzed by two-dimensional polyacrylamide gel electrophoresis. Conditions of electrophoresis restricted attention to proteins that are positively charged at pH 8.6. Most of the major nucleolar protein spots co-electrophoresed with ribosomal pr...

متن کامل

Physical properties and protein constituents fo cytoplasmic and mitochondrial ribosomes of Xenopus laevis.

Cytoplasmic and mitochondrial ribosomes were isolated from ovaries of Xenopus Zaeuis. Subunits prepared from these ribosomes have relatively low poly(U)-directed poly(Phe) synthesizing activity when tested separately, but regain at least 80% of the activity of the original ribosomes when mixed. Buoyant densities in analytical CsCl gradients and chemical measurements of RNA and protein content i...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • The Journal of biological chemistry

دوره 247 14  شماره 

صفحات  -

تاریخ انتشار 1972