Protein Structure from Scientific Research

Three classes of 70S ribosomes with different translating states or L1 stalk conformations. Class 1 is in decoding state with EF-Tu binding tRNA adopting to A-site. Class 2 and 3 are in classic non-rotated state, showing A-site and P-site tRNAs, while L1 stalks are in different positions (class 2, L1 stalk is open; class 3, L1 stalk is intermediate close, highlighted in c ).

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