3L31:
reference: Crystal structures of the CBS and DRTGG domains of the regulatory region of Clostridiumperfringens pyrophosphatase complexed with the inhibitor, AMP, and activator, diadenosine tetraphosphate., Tuominen H, Salminen A, Oksanen E, Jamsen J, Heikkila O, Lehtio L, Magretova NN, Goldman A, Baykov AA, Lahti R, J Mol Biol. 2010 May 7;398(3):400-13. Epub 2010 Mar 19. PMID: 20303981

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