Download MendeleyEffect of Modifier Structure on the Activation of Leukotriene A4Hydrolase Aminopeptidase Activity.
Lee, K.H., Petruncio, G., Shim, A., Burdick, M., Zhang, Z., Shim, Y.M., Noble, S.M., Paige, M.(2019) J Med Chem 62: 10605-10616
- PubMed: 31751136
- DOI: https://doi.org/10.1021/acs.jmedchem.9b00663
- Primary Citation of Related Structures:
6O5H - PubMed Abstract:
Activation of the leukotriene A 4 hydrolase (LTA 4 H) aminopeptidase (AP) activity with 4-methoxydiphenylmethane (4MDM) promoted resolution of neutrophil infiltration in a murine cigarette smoke-induced model for emphysematous chronic obstructive pulmonary disease. Recently, 4-(4-benzylphenyl)thiazol-2-amine (ARM1) was published as a ligand for LTA 4 H with potential anti-inflammatory properties. To investigate the effect of modifier structure on enzyme kinetics of LTA 4 H, a series of analogues bearing structural features of ARM1 and 4MDM were synthesized using trifluoroborate Suzuki coupling reactions. Following, the 2.8 Å X-ray crystal structure of LTA 4 H complexed with 4-OMe-ARM1, a 4MDM-ARM1 hybrid molecule, was determined. Kinetic analysis showed that ARM1 and related analogues lowered affinity for the enzyme-substrate complex, resulting in a change of mechanism from hyperbolic mixed predominately catalytic activation (HMx(Sp < Ca)A) as observed for 4MDM to a predominately specific activation (HMx(Sp > Ca)A) mechanism. 4-OMe-ARM1 was then shown to dose responsively reduce LTB 4 production in human neutrophils.
Organizational Affiliation:
Department of Chemistry & Biochemistry , George Mason University , 10920 George Mason Circle , Manassas , Virginia 20110 , United States.
