1Y7O:
reference: The ClpP double ring tetradecameric protease exhibits plastic ring-ring interactions, and the N termini of its subunits form flexible loops that are essential for ClpXP and ClpAP complex formation., Gribun A, Kimber MS, Ching R, Sprangers R, Fiebig KM, Houry WA, J Biol Chem 2005 Apr 22;280(16):16185-96. Epub 2005 Feb 8. PMID: 15701650

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