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Redox-based inactivation of cysteine cathepsins by compounds containing the 4-aminophenol moiety
Mirković, Bojana (Avtor), Sosič, Izidor (Avtor), Gobec, Stanislav (Avtor), Kos, Janko (Avtor)

URLURL - Predstavitvena datoteka, za dostop obiščite http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0027197 Povezava se odpre v novem oknu

Izvleček
Redox cycling compounds have been reported to cause false positive inhibition of proteases in drug discovery studies. This kind of false positives can lead to unusually high hit rates in high-throughput screening campaigns and require further analysis to distinguish true from false positive hits. Such follow-up studies are both time and resource consuming. METHODS AND FINDINGS:In this study we show that 5-aminoquinoline-8-ol is a time-dependent inactivator of cathepsin B with a k(inact)/K(I) of 36.7 13.6 M(-1)s(-1) using enzyme kinetics. 5-Aminoquinoline-8-ol inhibited cathepsins H, L and B in the same concentration range, implying a non-specific mechanism of inhibition. Further analogues, 4-aminonaphthalene-1-ol and 4-aminophenol, also displayed time-dependent inhibition of cathepsin B with k(inact)/K(I) values of 406.4 10.8 and 36.5 1.3 M(-1)s(-1). No inactivation occurred in the absence of either the amino or the hydroxyl group, suggesting that the 4-aminophenol moiety is a prerequisite for enzyme inactivation. Induction of redox oxygen species (ROS) by 4-aminophenols in various redox environments was determined by the fluorescent probe 2',7'-dichlorodihydrofluorescein diacetate. Addition of catalase to the assay buffer significantly abrogated the ROS signal, indicating that H(2)O(2) is a component of the ROS induced by 4-aminophenols. Furthermore, using mass spectrometry, active site probe DCG-04 and isoelectric focusing we show that redox inactivation of cysteine cathepsins by 5-aminoquinoline-8-ol is active site directed and leads to the formation of sulfinic acid. CONCLUSIONS: In this study we report that compounds containing the 4-aminophenol moiety inactivate cysteine cathepsins through a redox-based mechanism and are thus likely to cause false positive hits in the screening assays for cysteine proteases.

Jezik:Angleški jezik
Ključne besede:katepsini, masna spektrometrija, 4-aminofenoli
Vrsta gradiva:Delo ni kategorizirano (r6)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FFA - Fakulteta za farmacijo
Leto izida:2011
Št. strani:str. 1-11
Številčenje:no. 11, art. no. e27197
UDK:542+577
ISSN pri članku:1932-6203
COBISS.SI-ID:3151985 Povezava se odpre v novem oknu
Število ogledov:413
Število prenosov:296
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
 
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Naslov:PloS one
Založnik:Public Library of Science
COBISS.SI-ID:2005896 Povezava se odpre v novem oknu

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