Quaternary structure of the small ribosomal subunit of Escherichia coli determined by neutron diffraction

A complete three-dimensional mapping of the 21 proteins of the small ribosomal subunit of E. coli has been generated from 105 interprotein distance measurements derived from small-angle neutron scattering data, obtained in solution. A statistical analysis of the map and comparison with the results of similar mappings, using other biochemical or biophysical measurements, are presented.