| 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. |
