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[Changes in subunit conformation and their reciprocal configuration in the transition from the pretranslocated to the

G G Abdurashidova, E A Tsvetkova, E I Budovskiĭ

Bioorganicheskaia Khimiia

|March 1, 1985

Abstract:

RNA-protein contacts in pretranslocated and posttranslocated states of E. coli ribosomes have been determined by means of UV-induced cross-linking. In the two functional states as well as in free 70C ribosome, the same proteins are involved in RNA-protein intersubunit contacts, located in the region of L1 protuberance (left side of 70S ribosome). The transition from pre- to posttranslocated state is accompanied by disappearance of RNA-protein contacts in the region of L7/L12 stalk. This favours the locking-unlocking model of the translating ribosome.

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