Article: Photoaffinity inhibition of rat liver NAD(P)H dehydrogenase by 3-(alpha-acetonyl-p-azidobenzyl)-4-hydroxycoumarin.
1981 Volume 20, Issue 13, Page(s) 3731–3737
Abstract: NAD(P)H dehydrogenase was purified in four steps from a homogenate of rat liver. The final step was ... inhibited competitively with respect to NADH by 3-(alpha-acetonyl-p-nitrobenzyl)-4-hydroxycoumarin ...
Abstract | NAD(P)H dehydrogenase was purified in four steps from a homogenate of rat liver. The final step was affinity chromatography on Sepharose coupled to 3,3'-(m-hydroxybenzylidene)bis(4-hydroxycoumarin). The purified enzyme was inhibited competitively with respect to NADH by 3-(alpha-acetonyl-p-nitrobenzyl)-4-hydroxycoumarin (acenocoumarin) (Ki = 1.7 microM). The acenocoumarin was converted into an azide which was used to photoaffinity inhibit the enzyme. Following photolysis in the presence of the azide, the enzyme was inactivated in proportion to the concentration of azide present during irradiation. A maximum of 35-40% inhibition could be achieved by a single irradiation at 254 nm for 1.5 min. This inhibition was noncompetitive with respect to NADH. The inactivation was shown to be specific as acenocoumarin afforded complete protection against inactivation, irradiation was required to achieve inactivation, and the enzyme was unaffected by irradiation alone. |
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MeSH term(s) | Acenocoumarol/pharmacology ; Affinity Labels/pharmacology ; Animals ; Azides ; Chromatography, Affinity ; Liver/enzymology ; NADH, NADPH Oxidoreductases/antagonists & inhibitors ; NADPH Dehydrogenase/antagonists & inhibitors ; NADPH Dehydrogenase/isolation & purification ; NADPH Dehydrogenase/radiation effects ; Photolysis ; Rats ; Warfarin/analogs & derivatives ; Warfarin/pharmacology |
Chemical Substances | Affinity Labels ; Azides ; Warfarin (5Q7ZVV76EI) ; azidowarfarin (77741-79-8) ; NADH, NADPH Oxidoreductases (EC 1.6.-) ; NADPH Dehydrogenase (EC 1.6.99.1) ; Acenocoumarol (I6WP63U32H) |
Language | English |
Publishing date | 1981-06-23 |
Publishing country | United States |
Document type | Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, P.H.S. |
ZDB-ID | 1108-3 |
ISSN | 1520-4995 ; 0006-2960 |
ISSN (online) | 1520-4995 |
ISSN | 0006-2960 |
DOI | 10.1021/bi00516a010 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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