Synthesis and Characterization of Pyridine Compounds for Amperometric Measurements of Leukocyte Esterase.
Chembiochem
; 19(14): 1488-1491, 2018 Jul 16.
Article
em En
| MEDLINE
| ID: mdl-29679431
ABSTRACT
We introduce a new class of substrates (compounds I-III) for leukocyte esterase (LE) that react with LE yielding anodic current in direct proportion to LE activity. The kinetic constants Km and kcat for the enzymatic reactions were determined by amperometry at a glassy carbon electrode. The binding affinity of I-III for LE was two orders of magnitude better than that of existing optical LE substrates. The specificity constant kcat /Km was equal to 2.7, 3.8, and 5.8×105 m-1 s-1 for compounds containing the pyridine (I), methoxypyridine (II), and (methoxycarbonyl)pyridine (III), respectively, thus showing an increase in catalytic efficiency in this order. Compound III had the lowest octanol/water partition coefficient (log p=0.33) along with the highest topological surface area (tPSA=222â
Å2 ) and the best aqueous solubility (4.0â
mg mL-1 ). The average enzymatic activity of LE released from a single leukocyte was equal to 4.5â
nU when measured with compound III.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article