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Volumn 121, Issue 49, 1999, Pages 11356-11368

β-Secondary kinetic isotope effects in the clavaminate synthase- catalyzed oxidative cyclization of proclavaminic acid and in related azetidinone model reactions

Author keywords

[No Author keywords available]

Indexed keywords

2 OXOGLUTARIC ACID; AZETIDINONE DERIVATIVE; BETA LACTAMASE; CARBON 14; CLAVULANIC ACID; OXYGENASE; TRITIUM;

EID: 0033572748     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja992649d     Document Type: Article
Times cited : (30)

References (43)
  • 8
    • 0002590285 scopus 로고
    • Cleland, W. W., O'Leary, M. H., Northrup, D. B., Eds.; University Park Press: Baltimore, MD
    • Northrup, D. B. In Isotope Effects in Enzyme-Catalyzed Reactions; Cleland, W. W., O'Leary, M. H., Northrup, D. B., Eds.; University Park Press: Baltimore, MD, 1977; pp 122-152.
    • (1977) Isotope Effects in Enzyme-Catalyzed Reactions , pp. 122-152
    • Northrup, D.B.1
  • 18
    • 0342764857 scopus 로고    scopus 로고
    • note
    • 3, will be perturbed to increase p-character to ligands in the strained, four-membered ring, and increase s-character (increase bond strength) to the C-H bonds undergoing change in the course of reaction.
  • 19
    • 0004233459 scopus 로고
    • Buncel, E., Lee, C. C., Eds.; Elsevier: Amsterdam
    • Cleland, W. W. In Secondary and Solvent Isotope Effects; Buncel, E., Lee, C. C., Eds.; Elsevier: Amsterdam, 1987; pp 61-113.
    • (1987) Secondary and Solvent Isotope Effects , pp. 61-113
    • Cleland, W.W.1
  • 22
    • 0343635139 scopus 로고    scopus 로고
    • note
    • All substrates were planned to be equally labeled with deuterium at both C-3 methylene positions to amplify the β-isotope effect. While the CS-catalyzed oxidative cyclization is a stereospecific process and the β-secondary kinetic isotope effect may differ depending on which hydrogen (deuterium) at C-3′ is syn clinal or gauche to the breaking C-H bond, this stereochemical distinction will escape analysts. However, if a fully developed p-orbital exists at the transition state, the effects of both C-3 deuteria will be the same.
  • 36
    • 0032538627 scopus 로고    scopus 로고
    • This is likely to be quite variable and not accurately represented by a macroscopic value (Warshel, A. J. Biol. Chem. 1998, 273, 27035-27038). Nonetheless, macroscopic dielectrics for active sites have been variously estimated to range from 4 to 40 with 10 taken as an average value (Warshel, A. Annu. Rev. Biophys. Biophys. Chem. 1991, 20, 267-298). Jordan has experimentally determined an ∈ = 13-15 in a very recent example (Jordan, F.; Li, H.; Brown, A. Biochemists 1999, 38, 6369-6373).
    • (1998) J. Biol. Chem. , vol.273 , pp. 27035-27038
    • Warshel, A.1
  • 37
    • 0025891413 scopus 로고
    • This is likely to be quite variable and not accurately represented by a macroscopic value (Warshel, A. J. Biol. Chem. 1998, 273, 27035-27038). Nonetheless, macroscopic dielectrics for active sites have been variously estimated to range from 4 to 40 with 10 taken as an average value (Warshel, A. Annu. Rev. Biophys. Biophys. Chem. 1991, 20, 267-298). Jordan has experimentally determined an ∈ = 13-15 in a very recent example (Jordan, F.; Li, H.; Brown, A. Biochemists 1999, 38, 6369-6373).
    • (1991) Annu. Rev. Biophys. Biophys. Chem. , vol.20 , pp. 267-298
    • Warshel, A.1
  • 38
    • 0033580678 scopus 로고    scopus 로고
    • This is likely to be quite variable and not accurately represented by a macroscopic value (Warshel, A. J. Biol. Chem. 1998, 273, 27035-27038). Nonetheless, macroscopic dielectrics for active sites have been variously estimated to range from 4 to 40 with 10 taken as an average value (Warshel, A. Annu. Rev. Biophys. Biophys. Chem. 1991, 20, 267-298). Jordan has experimentally determined an ∈ = 13-15 in a very recent example (Jordan, F.; Li, H.; Brown, A. Biochemists 1999, 38, 6369-6373).
    • (1999) Biochemists , vol.38 , pp. 6369-6373
    • Jordan, F.1    Li, H.2    Brown, A.3
  • 41
    • 0343635131 scopus 로고
    • The microscopic reverse of this process would be protodemetalation. For the case of protodemercurations, β-secondary kinetic isotope effects have been observed to be very low or nonexistent, in contrast to the CS-catalyzed reaction (Bencivengo, D. J.; Brownawell, M. L.; Li, M.-Y.; San Filippo, Jr., J. J. Am. Chem. Soc. 1984, 106, 3703-3704).
    • (1984) J. Am. Chem. Soc. , vol.106 , pp. 3703-3704
    • Bencivengo, D.J.1    Brownawell, M.L.2    Li, M.-Y.3    San Filippo J., Jr.4


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.