4B6R

Structure of Helicobacter pylori Type II Dehydroquinase inhibited by (2S)-2-(4-methoxy)benzyl-3-dehydroquinic acid

Summary for 4B6R

• Entry DOI: 10.2210/pdb4b6r/pdb
• Related: 1J2Y 2C4V 2C4W 2C57 2WKS 2XB9 2XD9 2XDA 4B6O 4B6P 4B6Q 4B6S
• Descriptor: 3-DEHYDROQUINATE DEHYDRATASE, (1R,2S,4S,5R)-2-(4-methoxyphenyl)methyl-1,4,5-trihydroxy-3-oxocyclohexane-1-carboxylic acid, SULFATE ION, ... (4 entities in total)
• Functional Keywords: lyase
• Biological source: HELICOBACTER PYLORI 26695
• Total number of polymer chains: 3
• Total formula weight: 56524.70

Authors

Otero, J.M.,Llamas-Saiz, A.L.,Lence, E.,Tizon, L.,Peon, A.,Prazeres, V.F.V.,Lamb, H.,Hawkins, A.R.,Gonzalez-Bello, C.,van Raaij, M.J. (deposition date: 2012-08-14, release date: 2012-12-19, Last modification date: 2023-12-20)

Primary citation

Lence, E.,Tizon, L.,Otero, J.M.,Peon, A.,Prazeres, V.F.,Llamas-Saiz, A.L.,Fox, G.C.,van Raaij, M.J.,Lamb, H.,Hawkins, A.R.,Gonzalez-Bello, C.
Mechanistic basis of the inhibition of type II dehydroquinase by (2S)- and (2R)-2-benzyl-3-dehydroquinic acids.
ACS Chem. Biol., 8:568-577, 2013

PubMed Abstract: The structural changes caused by the substitution of the aromatic moiety in (2S)-2-benzyl-3-dehydroquinic acids and its epimers in C2 by electron-withdrawing or electron-donating groups in type II dehydroquinase enzyme from M. tuberculosis and H. pylori has been investigated by structural and computational studies. Both compounds are reversible competitive inhibitors of this enzyme, which is essential in these pathogenic bacteria. The crystal structures of M. tuberculosis and H. pylori in complex with (2S)-2-(4-methoxy)benzyl- and (2S)-2-perfluorobenzyl-3-dehydroquinic acids have been solved at 2.0, 2.3, 2.0, and 1.9 Å, respectively. The crystal structure of M. tuberculosis in complex with (2R)-2-(benzothiophen-5-yl)methyl-3-dehydroquinic acid is also reported at 1.55 Å. These crystal structures reveal key differences in the conformation of the flexible loop of the two enzymes, a difference that depends on the presence of electron-withdrawing or electron-donating groups in the aromatic moiety of the inhibitors. This loop closes over the active site after substrate binding, and its flexibility is essential for the function of the enzyme. These differences have also been investigated by molecular dynamics simulations in an effort to understand the significant inhibition potency differences observed between some of these compounds and also to obtain more information about the possible movements of the loop. These computational studies have also allowed us to identify key structural factors of the H. pylori loop that could explain its reduced flexibility in comparison to the M. tuberculosis loop, specifically by the formation of a key salt bridge between the side chains of residues Asp18 and Arg20.

PubMed: 23198883
DOI: 10.1021/cb300493s

Experimental method

X-RAY DIFFRACTION (2 Å)