@article { ISI:000323584400008,
	title = {Structural modelling of substrate binding and inhibition in penicillin V acylase from pectobacterium atrosepticum},
	journal = {Biochemical and Biophysical Research Communications},
	volume = {437},
	number = {4},
	year = {2013},
	month = {AUG},
	pages = {538-543},
	publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE},
	address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA},
	abstract = {<p>Penicillin V acylases (PVAs) and bile salt hydrolases (BSHs) have considerable sequence and structural similarity; however, they vary significantly in their substrate specificity. We have identified a PVA from a Gram-negative organism, Pectobacterium atrosepticum (PaPVA) that turned out to be a remote homolog of the PVAs and BSHs reported earlier. Even though the active site residues were conserved in PaPVA it showed high specificity towards penV and interestingly the penV acylase activity was inhibited by bile salts. Comparative modelling and docking studies were carried out to understand the structural differences of the binding site that confer this characteristic property. We show that PaPVA exhibits significant differences in structure, which are in contrast to those of known PVAs and such enzymes from Gram-negative bacteria require further investigation. (C) 2013 Elsevier Inc. All rights reserved.</p>},
	keywords = {Bile salt hydrolase, docking, Homology modelling, Inhibition, Pectobacterium, Penicillin acylase},
	issn = {0006-291X},
	doi = {10.1016/j.bbrc.2013.06.109},
	author = {Avinash, Vellore Sunder and Panigrahi, Priyabrata and Suresh, C. G. and Pundle, Archana V. and Ramasamy, Sureshkumar}
}
@article { ISI:000368973000001,
	title = {Structural analysis of a penicillin V acylase from pectobacterium atrosepticum confirms the importance of two Trp residues for activity and specificity},
	journal = {Journal of Structural Biology},
	volume = {193},
	number = {2},
	year = {2016},
	month = {FEB},
	pages = {85-94},
	publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE},
	address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA},
	abstract = {<p>Penicillin V acylases (PVA) catalyze the deacylation of the beta-lactam antibiotic phenoxymethylpenicillin (Pen V). They are members of the Ntn hydrolase family and possess an N-terminal cysteine as the main catalytic nucleophile residue. They form the evolutionarily related cholylglycine hydrolase (CGH) group which includes bile salt hydrolases (BSH) responsible for bile deconjugation. Even though a few PVA and BSH structures have been reported, no structure of a functional PVA from Gram-negative bacteria is available. Here, we report the crystal structure of a highly active PVA from Gram-negative Pectobacterium atrosepticum (PaPVA) at 2.5 angstrom resolution. Structural comparison with PVAs from Gram-positive bacteria revealed that PaPVA had a distinctive tetrameric structure and active site organization. In addition, mutagenesis of key active site residues and biochemical characterization of the resultant variants elucidated the role of these residues in substrate binding and catalysis. The importance of residue Trp23 and Trp87 side chains in binding and correct positioning of Pen V by PVAs was confirmed using mutagenesis and substrate docking with a 15 ns molecular dynamics simulation. These results establish the unique nature of Gram-negative CGHs and necessitate further research about their substrate spectrum. (C) 2015 Elsevier Inc. All rights reserved.</p>},
	keywords = {Aromatic stacking, Cholylglycine hydrolase, molecular dynamics, Mutagenesis, Oligomeric interactions},
	issn = {1047-8477},
	doi = {10.1016/j.jsb.2015.12.008},
	author = {Avinash, Vellore Sunder and Panigrahi, Priyabrata and Chand, Deepak and Pundle, Archana and Suresh, Cheravakattu Gopalan and Ramasamy, Sureshkumar}
}
