3M4G:
reference: The structures of mutant forms of Hfq from Pseudomonas aeruginosa reveal the importance of the conserved His57 for the protein hexamer organization., Moskaleva O, Melnik B, Gabdulkhakov A, Garber M, Nikonov S, Stolboushkina E, Nikulin A, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2010 Jul 1;66(Pt, 7):760-4. Epub 2010 Jun 23. PMID: 20606268

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