4AC6:
reference: Crystal and solution studies reveal that the transcriptional regulator AcnR of Corynebacterium glutamicum is regulated by citrate:Mg2+ binding to a non-canonical pocket., Garcia-Nafria J, Baumgart M, Turkenburg JP, Wilkinson AJ, Bott M, Wilson KS, J Biol Chem. 2013 Apr 15. PMID: 23589369

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