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1 in the presence of distinct B(1)(2) analogs (corrinoids).
2 12 but does so without adenosylation of this corrinoid.
3 eine or dithiothreitol, resulting in a Co(I) corrinoid.
4 ltransferases catalyze the activation of the corrinoid.
5 Several known enzymes adenosylate corrinoids.
6 5.0-5.3 for PceA enzyme and 3.7-4.5 for the corrinoids.
7 radation, debromination by Zn(0) and reduced corrinoids.
8 ll structure but a different selectivity for corrinoids.
9 grow on acetate in the absence of exogenous corrinoids.
10 parameters that are unprecedented for Co(2+)corrinoids.
12 --> pi transitions, which dominate the Co(2+)corrinoid Abs spectra, are essentially insulated from pe
13 potassium borohydride in in vitro assays for corrinoid adenosylation catalyzed by the ATP:co(I)rrinoi
15 d as a substrate for EutT, the ATP-dependent corrinoid adenosyltransferase and for the EutA ethanolam
18 mensional crystal structure of the PduO-type corrinoid adenosyltransferase from Lactobacillus reuteri
19 The functional assignment of LrPduO as a corrinoid adenosyltransferase was confirmed by in vivo a
20 ially replaced by the cobA gene (a known ATP:corrinoid adenosyltransferase) but that optimal growth o
23 robic conditions, but it can form "complete" corrinoids aerobically by importing an "incomplete" corr
24 as well as the exchange and modification of corrinoids among community members have not been well st
25 view reaction mechanisms and the role of the corrinoid and Fe-S cluster cofactors and discuss physiol
26 mes of such anaerobic catabolic pathways are corrinoid and Fe-S cluster-containing, membrane-associat
27 wed a DMB-off/His-on interaction between the corrinoid and the enzyme, whose catalytic efficiency was
28 ssesses a high-affinity transport system for corrinoids and that this archaeon can synthesize cobamid
30 for dibromoelimination pathway with reduced corrinoids and Zn(0) particles; EDB biodegradation by An
32 in vivo, nonadenosylated cobalamin and other corrinoids are maintained as co(II)rrinoids by reduced f
34 ntial variations in ATP binding and probably corrinoid binding between CobA(Se) and CobA(Mm) enzymes.
35 ons of these homologies for the mechanism of corrinoid binding by proteins involved in methylotrophic
40 se in which MtsA mediates the methylation of corrinoid bound to MtsB with dimethylsulfide and subsequ
42 -visible spectra showed that enzyme Fe-S and corrinoid centers were already fully reduced at levels o
43 PduO can in fact also utilize the incomplete corrinoid Co (1+)cobinamide (Co (1+)Cbi) as an alternati
45 d freshwater habitats require for growth the corrinoid cofactor B12, which is synthesized de novo onl
46 ansferase II which remains firmly bound to a corrinoid cofactor binding subunit during isolation.
47 ine methyltransferase (MMAMT) methylates the corrinoid cofactor bound to a second polypeptide, monome
49 iguously establish the binding scheme of the corrinoid cofactor in the CFeSP, we have combined resona
52 small subunit (33 kDa) contains cobalt in a corrinoid cofactor, and the large subunit (55 kDa) conta
58 idazolylcobamide methyltransferase (MtaB), a corrinoid-containing methyl-accepting protein (MtaC) and
59 V-visible spectrum was typical of methylated corrinoid-containing proteins, with absorbance maxima at
61 h corrinoid-dependent enzymes do not produce corrinoids de novo, and instead must acquire corrinoids
62 aerobic conditions, S. enterica performs the corrinoid-dependent degradation of ethanolamine if given
66 wever, the profile of corrinoids produced in corrinoid-dependent microbial communities, as well as th
67 es and, together with two recently described corrinoid-dependent reductive dehalogenases, constitute
68 hromatography tandem mass spectrometry-based corrinoid detection method to examine relationships amon
69 computational methodology for studying Co(2+)corrinoid/enzyme active site interactions is demonstrate
76 rate mechanisms to capture and differentiate corrinoids in vivo and that apparent redundancies observ
77 e signature residues involved in binding the corrinoid, including a histidyl residue which ligates co
79 olves the formation of an "activated" Co (2+)corrinoid intermediate that lacks any significant axial
82 hat nitrate also decreased the levels of the corrinoid iron-sulfur protein (60%) and methyltransferas
83 actions between methyltransferase (MeTr) and corrinoid iron-sulfur protein (CFeSP) are required for t
85 Here we have studied the axial ligation of a corrinoid iron-sulfur protein (CFeSP) that plays a key r
86 thyl-cobalt(III) species on one protein (the corrinoid iron-sulfur protein (CFeSP)) to a nickel iron-
89 The gamma and delta subunits constitute a corrinoid iron-sulfur protein that is involved in the tr
90 CoA synthesis from CO, CoA, and a methylated corrinoid iron-sulfur protein, which acts as a methyl do
91 B(12)-dependent methyl transfer, namely the corrinoid iron-sulphur protein and its methyltransferase
93 he methyltetrahydrofolate (CH(3)-H(4)folate) corrinoid-iron-sulfur protein (CFeSP) methyltransferase
98 ible spectroscopy indicated that the reduced corrinoid/iron-sulfur component could be methylated with
99 oxidized CO and transferred electrons to the corrinoid/iron-sulfur component, reducing the iron-sulfu
100 4Fe-4S cluster previously identified in the corrinoid/iron-sulfur enzyme by electron paramagnetic re
101 x from Methanosarcina thermophila contains a corrinoid/iron-sulfur enzyme composed of two subunits (d
102 encoding the beta and alpha subunits of the corrinoid/iron-sulfur enzyme from Clostridium thermoacet
103 hermoaceticum catalyzes the methylation of a corrinoid/iron-sulfur protein (C/Fe-SP) by the N5 methyl
104 CH3-H4folate) to the cob(I)amide center of a corrinoid/iron-sulfur protein (CFeSP), forming H4folate
105 ate (CH3-H4folate) to the cobalt center of a corrinoid/iron-sulfur protein (CFeSP), forming methylcob
109 -kDa (alpha2epsilonx) subunits and a 100-kDa corrinoid/iron-sulfur protein with the 60- and 58-kDa su
110 s, initially annotated as hypothetical fused corrinoid/methyl transfer proteins, which are highly ele
113 wledge, DSY3156 is the first glycine betaine:corrinoid methyltransferase described, and a designation
114 ould be accounted for by the activity of the corrinoid methyltransferase enzyme, suggesting fractiona
116 atures are the presence of a monomethylamine:corrinoid methyltransferase, the first time that this en
118 of the Mts system, a set of three homologous corrinoid/methyltransferase fusion protein isoforms invo
119 , mtsF and mtsH genes, which encode putative corrinoid/methyltransferase isozymes involved in methyls
120 dehalogenation with the respective purified corrinoids (norpseudovitamin B12 and norvitamin B12), as
122 transferase that catalyze both ATP-dependent corrinoid phosphorylation and GTP-dependent guanylylatio
124 corrinoids de novo, and instead must acquire corrinoids produced by other organisms in their environm
127 s played by different phylogenetic groups in corrinoid production and corrinoid exchange within micro
128 imethylamine and specifically methylates the corrinoid prosthetic group of MtbC, which is subsequentl
130 h three purified proteins: a monomethylamine corrinoid protein (MMCP), the "A" isozyme of methylcobam
133 These results show that MMCP is the major corrinoid protein for methanogenesis from monomethylamin
134 These results indicate that the 480-kDa corrinoid protein functions as a CoM methylase during me
136 d in TMA-dependent methanogenesis, that this corrinoid protein is methylated by the substrate and dem
137 barkeri included the previously unidentified corrinoid protein MtbC, which copurified with MtbA, the
141 a methyl group originating from a methylated corrinoid protein, but no obvious means to carry out cor
142 he synthesis of acetyl-CoA from a methylated corrinoid protein, CO, and coenzyme A and (ii) the oxida
147 amine methyltransferase methylates a cognate corrinoid protein, which is subsequently demethylated by
149 t that RamA mediates reductive activation of corrinoid proteins and that it is the first functional a
150 ssesses the corrinoid binding motif found in corrinoid proteins involved in dimethylsulfide- and meth
154 orrinoid requirements in a community through corrinoid remodelling, in this case, by importing extrac
156 (1.4%) and cobinamide (1.8%) (an incomplete corrinoid) represented a small portion of the total amou
157 hat D. mccartyi is capable of fulfilling its corrinoid requirements in a community through corrinoid
159 from a molecule of ATP to a transient Co(1+)corrinoid species generated in the enzyme active site.
160 p from cosubstrate ATP to a transient Co (1+)corrinoid species generated in the enzyme active site.
162 computations reveals that this unique Co(2+)corrinoid species possesses an essentially square-planar
163 t between the Abs spectra of these two Co(2+)corrinoid species, MCD data reveal that substitution of
167 amically challenging reduction of its Co (2+)corrinoid substrates, we have examined how the enzyme ac
168 ids aerobically by importing an "incomplete" corrinoid, such as cobinamide (Cbi), and adding appropri
169 ection method to examine relationships among corrinoids, their lower ligand bases and specific microb
170 ATP-dependent reductive activation of Co(II) corrinoid to the Co(I) state for the monomethylamine cor
174 epsilonCl of PCE depended in addition on the corrinoid type: epsilonC/epsilonCl values of 4.6 and 5.0
175 that was preincubated with ATP, both Co (2+)corrinoids undergo a partial ( approximately 40-50%) con
176 inoids interact only weakly with CobA, Co(2+)corrinoids undergo partial conversion to a new paramagne
177 existence of a putative ABC transporter for corrinoid utilization in the extremely halophilic archae
179 PCE dehalogenation by enzymes and different corrinoids, whereas such differences were not observed f
180 ide and subsequently demethylates MtsB-bound corrinoid with coenzyme M, possibly employing elements o
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