[The role of ribosomal proteins in in vitro ribosome-membrane interactions].

The in vitro binding of total ribosomal proteins with rough endoplasmic membranes, from which 70% of ribosomes are eliminated by EDTA (ME) is studied. It is found that in conditions of specific interaction of ribosomes with membranes about 75% of total ribosomal proteins are bound with ME. Membranes, heterogenous in their content (different protein/lipid ratio), became homogenous in their buyoant density after the binding with proteins. The ability of membrane-ribosomal protein complex to bind ribosomes is not decreased, as it can be expected, but is considerablly increased, thus indicating on a non-specific character of ribosome binding. Ribosomal subunits lacking about half of structural protein are capable to bind with ribosome-binding membrane receptors and with some additional sites. This binding is also non-specific, because the binding efficiency of large and small subunits is the same.