title: Shape of proteins S3 and S17 from the small subunit of Escherichia coli ribosome.
abstract: The shapes of proteins S3 and S17 purified from the 30 S subunit of Escherichia coli A19 were studied by hydrodynamic methods. The proteins have s020,w values of 2.1 +/- 0.1 S and 1.2 +/- 0.1 S and D020,w values of 7.4 +/- 0.5 . 10(-7) cm2/s and 11.4 +/- 0.6 . 10(-7) cm2/s. The respective molecular weights determined by sedimentation equilibrium are 25 800 +/- 500 and 9900 +/- 300. The intrinsic viscosity values for the two proteins are 5.8 +/- 0.3 ml/g and 4.2 +/- 0.2 ml/g. From these hydrodynamic parameters a slightly elongated shape for S3 and a globular shape for S17 have been concluded.
mesh_terms: D001426:Bacterial Proteins / Q000302:isolation & purification*; D055598:Chemical Phenomena; D002621:Chemistry; D004926:Escherichia coli / Q000378:metabolism*; D008970:Molecular Weight; D011487:Protein Conformation; D012269:Ribosomal Proteins / Q000302:isolation & purification*; D013347:Subcellular Fractions / Q000032:analysis*; D014783:Viscosity
chemical_list: D001426:Bacterial Proteins; D012269:Ribosomal Proteins