4V5M:
reference: Head swivel on the ribosome facilitates translocation by means of intra-subunit tRNA hybrid sites., Ratje AH, Loerke J, Mikolajka A, Brunner M, Hildebrand PW, Starosta AL, Donhofer A, Connell SR, Fucini P, Mielke T, Whitford PC, Onuchic JN, Yu Y, Sanbonmatsu KY, Hartmann RK, Penczek PA, Wilson DN, Spahn CM, Nature. 2010 Dec 2;468(7324):713-6. PMID: 21124459

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