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Peter J Anderson et al.
Journal of bacteriology, 190(4), 1160-1171 (2007-11-06)
Corrinoid (vitamin B12-like) cofactors contain various alpha-axial ligands, including 5,6-dimethylbenzimidazole (DMB) or adenine. The bacterium Salmonella enterica produces the corrin ring only under anaerobic conditions, but it can form "complete" corrinoids aerobically by importing an "incomplete" corrinoid, such as cobinamide
Peng Wang et al.
Applied biochemistry and biotechnology, 167(1), 62-72 (2012-04-25)
An efficient metabolic control approach was developed to improve the industrial anaerobic fermentation of adenosylcobalamin (ado-cbl) by Propionibacterium freudenreichii. The effects of 5,6-dimethylbenzimidazole (DMB) on cell growth and ado-cbl biosynthesis were investigated. Subsequently, the results obtained from the batch culture
Jeanne Sirovatka Dorweiler et al.
Biochemistry, 42(49), 14653-14662 (2003-12-10)
Cobalamin-dependent methionine synthase (MetH) catalyzes the transfer of methyl groups between methyltetrahydrofolate (CH(3)-H(4)folate) and homocysteine, with the enzyme-bound cobalamin serving as an intermediary in the methyl transfers. An MetH fragment comprising residues 2-649 contains modules that bind and activate CH(3)-H(4)folate
Daniel J Kim et al.
Proceedings of the National Academy of Sciences of the United States of America, 117(27), 15837-15845 (2020-06-24)
Despite broad appreciation of their clinical utility, it has been unclear how vitamin B12 and folic acid (FA) function at the molecular level to directly prevent their hallmark symptoms of deficiency like anemia or birth defects. To this point, B12
Ruibing Wang et al.
Dalton transactions (Cambridge, England : 2003), (18)(18), 3584-3589 (2009-04-22)
Cucurbit[7]uril (CB[7]) forms very stable complexes with the alpha-axial 5,6-dimethylbenzimidazole (alpha-DMB) nucleotide base when dissociated from the Co(III) center in vitamin B(12) (CNCbl, K(CB[7]) = (7.5 +/- 0.5) x 10(4) dm(3) mol(-1)) and coenzyme B(12) (AdoCbl, K(CB[7]) = (3.02 +/-
Xiao-Lei Wang et al.
Journal of the American Chemical Society, 133(11), 4079-4091 (2011-02-25)
BluB is a distinct flavin destructase that catalyzes a complex oxygen-dependent conversion of reduced flavin mononucleotide (FMNH(2)) to form 5,6-dimethylbenzimidazole (DMB), the lower ligand of vitamin B(12). The catalyzed mechanism remains a challenge due to the discrepancy between the complexity
V Krishnakumar et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 68(3), 811-816 (2007-05-04)
The vibrational spectra of 5,6-dimethyl benzimidazole (5,6DBZ) have been computed using the standard B3LYP/6-311G** method and basis set combinations. The solid phase FT-IR and FT-Raman spectra were recorded in the region 4000-400 and 3500-100 cm(-1), respectively. A close agreement was
Biochemistry: molecular cannibalism.
Steven E Ealick et al.
Nature, 446(7134), 387-388 (2007-03-23)
Hanaa A Hassanin et al.
Dalton transactions (Cambridge, England : 2003), 39(44), 10626-10630 (2010-10-05)
The X-ray structures of three new crystals of nitroxylcobalamin (NOCbl) have been determined. Unlike our earlier reported structure in which NOCbl was partially oxidized (L. Hannibal, C. A. Smith, D. W. Jacobsen and N. E. Brasch, Angew. Chem., Int. Ed.
Jing-Yun Wu et al.
Inorganic chemistry, 47(22), 10349-10356 (2008-10-14)
Self-assembly of AgNO 3 with the semirigid tetratopic ligands 1,2,4,5-tetrakis(benzoimidazol-1-ylmethyl)benzene (TBim) and 1,2,4,5-tetrakis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene (TDMBim) afforded compounds [Ag 4(mu 4-TBim) 2(mu 2-eta (2)-NO 3) 2](NO 3) 2. (1)/ 2CH 2Cl 2.2CH 3OH ( 1mu (1)/ 2CH 2Cl 2.2CH 3OH) and [(NO
Vijay S Sharma et al.
Biochemistry, 42(29), 8900-8908 (2003-07-23)
Despite early claims that nitric oxide does not react with cobalamin under any circumstances, it is now accepted that NO has a high affinity for cobalamin in the 2+ oxidation state [Cbl(II)]. However, it is still the consensus that NO
Hamad M Alkahtani et al.
Bioorganic & medicinal chemistry letters, 22(3), 1317-1321 (2012-01-10)
We herein report the synthesis, biological activity and structure-activity relationship of derivatives of 5,6-dichloro-1-β-D-ribofuranosylbenzimidazole and benzo[d]imidazole. A lead compound 6o demonstrates potent anti-proliferative activity and the ability to induce cancer cell apoptosis.
Ta-Yi Yu et al.
Protein science : a publication of the Protein Society, 21(6), 839-849 (2012-04-25)
The "flavin destructase" enzyme BluB catalyzes the unprecedented conversion of flavin mononucleotide (FMN) to 5,6-dimethylbenzimidazole (DMB), a component of vitamin B(12). Because of its unusual chemistry, the mechanism of this transformation has remained elusive. This study reports the identification of
Michael J Gray et al.
Molecular microbiology, 74(5), 1198-1210 (2009-11-06)
The chemical structures of cobamides [cobalamin (Cbl)-like compounds] are the same, except for the lower ligand, which in adenosylcobalamin (AdoCbl) is 5,6-dimethylbenzimidazole, and in adenosylpseudocobalamin (AdopseudoCbl) is adenine. Why the lower ligand of cobamides varies and what the mechanism of
Christine Männel-Croisé et al.
Chemical communications (Cambridge, England), 47(40), 11249-11251 (2011-09-20)
Immobilisation of vitamin B12 allows synthesising a biomimetic base-off/histidine-on complex that resembles structural features of cobalamin dependent enzyme active sites.
Hanaa A Hassanin et al.
Dalton transactions (Cambridge, England : 2003), (3)(3), 424-433 (2009-01-06)
The structure of nitrosylcobalamin (NOCbl) in solution has been studied by NMR spectroscopy and the 1H and 13C NMR spectra have been assigned. 13C and 31P NMR chemical shifts, the UV-vis spectrum of NOCbl and the observed pKbase-off value of
Lourdes Santana et al.
Journal of medicinal chemistry, 51(21), 6740-6751 (2008-10-07)
The work provides a new model for the prediction of the MAO-A and -B inhibitor activity by the use of combined complex networks and QSAR methodologies. On the basis of the obtained model, we prepared and assayed 33 coumarin derivatives
Michiko E Taga et al.
Nature, 446(7134), 449-453 (2007-03-23)
Vitamin B12 (cobalamin) is among the largest known non-polymeric natural products, and the only vitamin synthesized exclusively by microorganisms. The biosynthesis of the lower ligand of vitamin B(12), 5,6-dimethylbenzimidazole (DMB), is poorly understood. Recently, we discovered that a Sinorhizobium meliloti
Finding the final pieces of the vitamin B12 biosynthetic jigsaw.
Martin J Warren
Proceedings of the National Academy of Sciences of the United States of America, 103(13), 4799-4800 (2006-03-29)
Michael J Gray et al.
Proceedings of the National Academy of Sciences of the United States of America, 104(8), 2921-2926 (2007-02-16)
The synthesis of 5,6-dimethylbenzimidazole (DMB), the lower ligand of coenzyme B(12), has remained elusive. We report in vitro and in vivo evidence that the BluB protein of the photosynthetic bacterium Rhodospirillum rubrum is necessary and sufficient for catalysis of the
Jun Yan et al.
Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 368(1616), 20120320-20120320 (2013-03-13)
Dehalococcoides mccartyi strains are corrinoid-auxotrophic Bacteria and axenic cultures that require vitamin B12 (CN-Cbl) to conserve energy via organohalide respiration. Cultures of D. mccartyi strains BAV1, GT and FL2 grown with limiting amounts of 1 µg l(-1) CN-Cbl quickly depleted
Lori A Maggio-Hall et al.
Organic letters, 5(13), 2211-2213 (2003-06-21)
Dimethylbezimidazole, the axial ligand of vitamin B(12), is synthesized from riboflavin by a two-electron oxidation, a retro-aldol condensation, and a second two-electron oxidation. This oxidative cascade readily takes place nonenzymatically under physiological conditions. [reaction: see text]
Pseudo-B12 joins the cofactor family.
Michiko E Taga et al.
Journal of bacteriology, 190(4), 1157-1159 (2007-12-18)
Kathy R Claas et al.
Journal of bacteriology, 192(1), 145-154 (2009-11-03)
In Salmonella enterica, the CobT enzyme activates the lower ligand base during the assembly of the nucleotide loop of adenosylcobalamin (AdoCbl) and other cobamides. Previously, mutational analysis identified a class of alleles (class M) that failed to restore AdoCbl biosynthesis
Thanasis Karapanayiotis et al.
European journal of mass spectrometry (Chichester, England), 11(4), 381-387 (2005-10-06)
Ionised benzimidazole and its isomeric alpha-distonic ion (or ionised ylid) have been examined by recording their metastable ion, collision-induced dissociation and neutralisation-reionisation mass spectra. These tautomers may be distinguished by careful consideration of key features of the collision-induced dissociation spectra
Jung-Feng Hsieh et al.
Bioorganic & medicinal chemistry, 15(10), 3450-3456 (2007-03-24)
Xanthine oxidase (XO) is a key enzyme which can catalyze xanthine to uric acid causing hyperuricemia in humans. By using the fractionation technique and inhibitory activity assay, an active compound that prevents XO from reacting with xanthine was isolated from
Gordon R O Campbell et al.
Proceedings of the National Academy of Sciences of the United States of America, 103(12), 4634-4639 (2006-03-16)
An insight into a previously unknown step in B(12) biosynthesis was unexpectedly obtained through our analysis of a mutant of the symbiotic nitrogen fixing bacterium Sinorhizobium meliloti. This mutant was identified based on its unusually bright fluorescence on plates containing
Hannah F Collins et al.
PloS one, 8(2), e55708-e55708 (2013-03-05)
Despite the extensive study of the biosynthesis of the complex molecule B12 (cobalamin), the mechanism by which the lower ligand 5,6-dimethylbenzimidazole (DMB) is formed has remained something of a mystery. However, recent work has identified and characterized a DMB-synthase (BluB)
Anthony A Sauve
Biochimica et biophysica acta, 1804(8), 1591-1603 (2010-02-06)
Sirtuins are ancient proteins widely distributed in all lifeforms of earth. These proteins are universally able to bind NAD(+), and activate it to effect ADP-ribosylation of cellular nucleophiles. The most commonly observed sirtuin reaction is the ADP-ribosylation of acetyllysine, which
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