PMID- 21531720
OWN - NLM
STAT- MEDLINE
DCOM- 20110908
LR  - 20170220
IS  - 1083-351X (Electronic)
IS  - 0021-9258 (Linking)
VI  - 286
IP  - 27
DP  - 2011 Jul 8
TI  - Potent family-18 chitinase inhibitors: x-ray structures, affinities, and binding 
      mechanisms.
PG  - 24312-23
LID - 10.1074/jbc.M110.183376 [doi]
AB  - Six novel inhibitors of Vibrio harveyi chitinase A (VhChiA), a family-18
      chitinase homolog, were identified by in vitro screening of a library of
      pharmacologically active compounds. Unlike the previously identified inhibitors
      that mimicked the reaction intermediates, crystallographic evidence from 14
      VhChiA-inhibitor complexes showed that all of the inhibitor molecules occupied
      the outer part of the substrate-binding cleft at two hydrophobic areas. The
      interactions at the aglycone location are well defined and tightly associated
      with Trp-397 and Trp-275, whereas the interactions at the glycone location are
      patchy, indicating lower affinity and a loose interaction with two consensus
      residues, Trp-168 and Val-205. When Trp-275 was substituted with glycine (W275G),
      the binding affinity toward all of the inhibitors dramatically decreased, and in 
      most structures two inhibitor molecules were found to stack against Trp-397 at
      the aglycone site. Such results indicate that hydrophobic interactions are
      important for binding of the newly identified inhibitors by the chitinase. X-ray 
      data and isothermal microcalorimetry showed that the inhibitors occupied the
      active site of VhChiA in three different binding modes, including single-site
      binding, independent two-site binding, and sequential two-site binding. The
      inhibitory effect of dequalinium in the low nanomolar range makes this compound
      an extremely attractive lead compound for plausible development of therapeutics
      against human diseases involving chitinase-mediated pathologies.
FAU - Pantoom, Supansa
AU  - Pantoom S
AD  - Biochemistry-Electrochemistry Research Unit, School of Chemistry, Institute of
      Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand.
FAU - Vetter, Ingrid R
AU  - Vetter IR
FAU - Prinz, Heino
AU  - Prinz H
FAU - Suginta, Wipa
AU  - Suginta W
LA  - eng
SI  - PDB/3ARO
SI  - PDB/3ARP
SI  - PDB/3ARQ
SI  - PDB/3ARR
SI  - PDB/3ARS
SI  - PDB/3ART
SI  - PDB/3ARU
SI  - PDB/3ARV
SI  - PDB/3ARW
SI  - PDB/3ARX
SI  - PDB/3ARY
SI  - PDB/3ARZ
SI  - PDB/3AS0
SI  - PDB/3AS1
SI  - PDB/3AS2
SI  - PDB/3AS3
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20110429
PL  - United States
TA  - J Biol Chem
JT  - The Journal of biological chemistry
JID - 2985121R
RN  - 0 (Bacterial Proteins)
RN  - 0 (Enzyme Inhibitors)
RN  - EC 3.2.1.14 (Chitinases)
SB  - IM
MH  - Bacterial Proteins/*antagonists & inhibitors/*chemistry
MH  - Catalytic Domain
MH  - Chitinases/*antagonists & inhibitors/*chemistry
MH  - Crystallography, X-Ray
MH  - Enzyme Inhibitors/*chemistry
MH  - Hydrophobic and Hydrophilic Interactions
MH  - *Models, Molecular
MH  - Molecular Structure
MH  - Protein Binding
MH  - Vibrio/*enzymology
PMC - PMC3129211
OID - NLM: PMC3129211
EDAT- 2011/05/03 06:00
MHDA- 2011/09/09 06:00
CRDT- 2011/05/03 06:00
PHST- 2011/05/03 06:00 [entrez]
PHST- 2011/05/03 06:00 [pubmed]
PHST- 2011/09/09 06:00 [medline]
AID - M110.183376 [pii]
AID - 10.1074/jbc.M110.183376 [doi]
PST - ppublish
SO  - J Biol Chem. 2011 Jul 8;286(27):24312-23. doi: 10.1074/jbc.M110.183376. Epub 2011
      Apr 29.