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Volumn 121, Issue 5, 1999, Pages 1037-1044

On the mechanism of action of vitamin B12: Theoretical studies of the 2-methyleneglutarate mutase catalyzed rearrangement

Author keywords

[No Author keywords available]

Indexed keywords

CYANOCOBALAMIN; GLUTARIC ACID DERIVATIVE; MUTASE;

EID: 0033540690     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9827245     Document Type: Article
Times cited : (38)

References (65)
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    • note
    • In this paper, all relative energies involving 9 correspond to the separated species. We note that in the course of our investigations we found hydrogen-bonded complexes between the 2-acrylic acid radical and acrylic acid that were more stable than the separated species but these are not discussed further in the present work.
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    • note
    • The stereochemistry indicated for 10 corresponds to the lowest energy B3-LYP/6-31G(d) conformation (see Figure 3). This stereochemistry has not yet been established experimentally. However, if a cycylopropyl-carbinyl radical such as 10 is an intermediate, it must have R stereochemistry at the carbon atom corresponding to the chiral center in (R)-3-methylitaconate.
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    • -1 in favor of the bent-coplanar structure for the 2-acrylic acid radical.
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    • -1.
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    • in press
    • For a discussion of the partial-proton-transfer concept in the context of enzyme-catalyzed reactions, see: Smith, D. M.; Golding, B. T.; Radom, L. J. Am. Chem. Soc. 1999, 121, in press.
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    • note
    • -1 (6-311+G(3df,2p)). Both values were obtained with the inclusion of MP2(full)/6-31G(d) zero-point vibrational energies.
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    • note
    • 396 suggest that H-atom abstraction is substantially rate-limiting in the overall transformation. Our calculations are consistent with the same conclusions for 2-methyleneglutarate mutase if the addition/elimination mechanism is in operation. However, in the case of the fragmentation/recombination mechanism, its higher barrier should cause it to become the rate-limiting step.
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    • note
    • The 2-acrylic-acid-radical (a component of 9) is shown in its lowest energy B3-LYP/6-31G(d) conformation. The conformational details of this species differ among the various theoretical procedures used. For a discussion, see text and note 35.


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