A ribonucleoprotein fragment of the 30 S ribosome of E. coli containing two contiguous domains of the 16 S RNA.
Ribonucleoprotein fragments of the 30 S ribosome of E. coli have been prepared by limited ribonuclease digestion and mild heating of the ribosome in a constant ionic environment. One such fragment has been described previously. A second electrophoretically homogeneous fragment has now been isolated and its RNA and protein moieties have been characterized. It contains the 5' half of the 16 S RNA, encompassing domains I and II except for the extreme 5' terminus and several small gaps. Seven proteins are present: S4, S5, S6, S8, S12, S15 and S20. The RNA binding sites of five of these proteins are known, and all are RNA sequences that are present in the fragment. Published neutron scattering and immuno-electron microscopic data indicate that six of the proteins are clustered together in a cross sectional slice through the center of the subunit. After deproteinization, the RNA moiety gives two bands in gel electrophoresis, one containing domains I and II and the other, essentially only domain II. The former, although larger, migrates faster in gel electrophoresis, indicating that RNA domains I and II interact with each other in such a way as to become more compact than domain II by itself.
D001483:Base Sequence; D004926:Escherichia coli / Q000235:genetics*; D008970:Molecular Weight; D009698:Nucleoproteins / Q000235:genetics*; D012335:RNA, Ribosomal / Q000235:genetics*; D012260:Ribonucleases; D012261:Ribonucleoproteins / Q000235:genetics*; D012269:Ribosomal Proteins / Q000235:genetics; D012270:Ribosomes / Q000378:metabolism
D009698:Nucleoproteins; D012335:RNA, Ribosomal; D012261:Ribonucleoproteins; D012269:Ribosomal Proteins; D012260:Ribonucleases