title: Selective inhibition of nicotinamide adenine dinucleotide kinases by dinucleoside disulfide mimics of nicotinamide adenine dinucleotide analogues.
abstract: Diadenosine disulfide (5) was reported to inhibit NAD kinase from Listeria monocytogenes and the crystal structure of the enzyme-inhibitor complex has been solved. We have synthesized tiazofurin adenosine disulfide (4) and the disulfide 5, and found that these compounds were moderate inhibitors of human NAD kinase (IC(50)=110 microM and IC(50)=87 microM, respectively) and Mycobacterium tuberculosis NAD kinase (IC(50)=80 microM and IC(50)=45 microM, respectively). We also found that NAD mimics with a short disulfide (-S-S-) moiety were able to bind in the folded (compact) conformation but not in the common extended conformation, which requires the presence of a longer pyrophosphate (-O-P-O-P-O-) linkage. Since majority of NAD-dependent enzymes bind NAD in the extended conformation, selective inhibition of NAD kinases by disulfide analogues has been observed. Introduction of bromine at the C8 of the adenine ring restricted the adenosine moiety of diadenosine disulfides to the syn conformation making it even more compact. The 8-bromoadenosine adenosine disulfide (14) and its di(8-bromoadenosine) analogue (15) were found to be the most potent inhibitors of human (IC(50)=6 microM) and mycobacterium NAD kinase (IC(50)=14-19 microM reported so far. None of the disulfide analogues showed inhibition of lactate-, and inosine monophosphate-dehydrogenase (IMPDH), enzymes that bind NAD in the extended conformation.
authors: Center for Drug Design, University of Minnesota, Minneapolis, MN 55455, USA.
authors: Riccardo
authors: R
authors: Petrelli
authors: Yuk Yin
authors: YY
authors: Sham
authors: Liqiang
authors: L
authors: Chen
authors: Krzysztof
authors: K
authors: Felczak
authors: Eric
authors: E
authors: Bennett
authors: Daniel
authors: D
authors: Wilson
authors: Courtney
authors: C
authors: Aldrich
authors: Jose S
authors: JS
authors: Yu
authors: Loredana
authors: L
authors: Cappellacci
authors: Palmarisa
authors: P
authors: Franchetti
authors: Mario
authors: M
authors: Grifantini
authors: Francesca
authors: F
authors: Mazzola
authors: Michele
authors: M
authors: Di Stefano
authors: Giulio
authors: G
authors: Magni
authors: Krzysztof W
authors: KW
authors: Pankiewicz
mesh_terms: D000241:Adenosine / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D001665:Binding Sites; D004220:Disulfides / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D006801:Humans; D008958:Models, Molecular; D008968:Molecular Conformation; D009169:Mycobacterium tuberculosis / Q000201:enzymology; D009243:NAD / Q000031:analogs & derivatives; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000378:metabolism; D012254:Ribavirin / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology
chemical_list: D004220:Disulfides; D009243:NAD; D012254:Ribavirin; D017853:Phosphotransferases (Alcohol Group Acceptor); C021844:NAD kinase; D000241:Adenosine; C033706:tiazofurin