1GHD:
reference: Affinity alkylation of the Trp-B4 residue of the beta -subunit of the glutaryl 7-aminocephalosporanic acid acylase of Pseudomonas sp. 130., Huang X, Zeng R, Ding X, Mao X, Ding Y, Rao Z, Xie Y, Jiang W, Zhao G, J Biol Chem 2002 Mar 22;277(12):10256-64. Epub 2002 Jan 8. PMID: 11782466

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