恶臭假单胞菌
单加氧酶
加氧酶
生物
AlkB
羟基苯甲酸盐
立体化学
生物化学
酶
化学
基因
细胞色素P450
DNA修复
作者
John T. Lazar,L. Shuvalova,Mónica Rosas‐Lemus,O. Kiryukhina,K.J.F. Satchell,G. Minasov
标识
DOI:10.1107/s2053230x19008653
摘要
The crystal structure is reported of p-hydroxybenzoate hydroxylase (PobA) from Pseudomonas putida, a possible drug target to combat tetracycline resistance, in complex with flavin adenine dinucleotide (FAD). The structure was refined at 2.2 Å resolution with four polypeptide chains in the asymmetric unit. Based on the results of pairwise structure alignments, PobA from P. putida is structurally very similar to PobA from P. fluorescens and from P. aeruginosa. Key residues in the FAD-binding and substrate-binding sites of PobA are highly conserved spatially across the proteins from all three species. Additionally, the structure was compared with two enzymes from the broader class of oxygenases: 2-hydroxybiphenyl 3-monooxygenase (HbpA) from P. nitroreducens and 2-methyl-3-hydroxypyridine-5-carboxylic acid oxygenase (MHPCO) from Mesorhizobium japonicum. Despite having only 14% similarity in their primary sequences, pairwise structure alignments of PobA from P. putida with HbpA from P. nitroreducens and MHPCO from M. japonicum revealed local similarities between these structures. Key secondary-structure elements important for catalysis, such as the βαβ fold, β-sheet wall and α12 helix, are conserved across this expanded class of oxygenases.
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