Probing interactions from solvent-exchangeable protons and monovalent cations with the 1,2-propanediol-1-yl radical intermediate in the reaction of dioldehydrase.

Probing interactions from solvent-exchangeable protons and monovalent cations with the 1,2-propanediol-1-yl radical intermediate in the reaction of dioldehydrase. Research Abstract Details 

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Probing interactions from solvent-exchangeable protons and monovalent cations with the 1,2-propanediol-1-yl radical intermediate in the reaction of dioldehydrase. Abstract Text:

Phillip A Schwartz,Russell Lobrutto,George H Reed,Perry A Frey,

The reaction of adenosylcobalamin-dependent dioldehydrase with 1,2-propanediol gives rise to a radical intermediate observable by EPR spectroscopy. This reaction requires a monovalent cation such as potassium ion. The radical signal arises from the formation of a radical pair comprised of the Co(II) of cob(II)alamin and a substrate-related radical generated upon hydrogen abstraction by the 5'-deoxyadenosyl radical. The high-field asymmetric doublet arising from the organic radical has allowed investigation of its composition and environment through the use of EPR spectroscopic techniques. To characterize the protonation state of the oxygen substituents in the radical intermediate, X-band EPR spectroscopy was performed in the presence of D(2)O and compared to the spectrum in H(2)O. Results indicate that the unpaired electron of the steady-state radical couples to a proton on the C(1) hydroxyl group. Other spectroscopic experiments were performed, using either potassium or thallous ion as the activating monovalent cation, in an attempt to exploit the magnetic nature of the (205,203)Tl nucleus to identify any intimate interaction of the radical intermediate with the activating cation. The radical intermediate in complex with dioldehydrase, cob(II)alamin and one of the activating monovalent cations was observed using EPR, ENDOR, and ESEEM spectroscopy. The spectroscopic evidence did not implicate a direct coordination of the activating cation and the substrate derived radical intermediate.

Probing interactions from solvent-exchangeable protons and monovalent cations with the 1,2-propanediol-1-yl radical intermediate in the reaction of dioldehydrase. Publishing Authors By Initials

PA Schwartz,R Lobrutto,GH Reed,PA Frey,

For similar inorganic chemicals: elements: metals, heavy: thallium research abstracts see: inorganic chemicals: elements: metals, heavy: thallium research

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Probing interactions from solvent-exchangeable protons and monovalent cations with the 1,2-propanediol-1-yl radical intermediate in the reaction of dioldehydrase. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Protein science : a publication of the Protein Soc

VOLUME: 16

Page Numbers: 1157-64

Journal Abbreviation: Protein Sci.

ISSN: 0961-8368

DAY: 3

MONTH: Jun

YEAR: 2007

Probing interactions from solvent-exchangeable protons and monovalent cations with the 1,2-propanediol-1-yl radical intermediate in the reaction of dioldehydrase. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9211750

Probing interactions from solvent-exchangeable protons and monovalent cations with the 1,2-propanediol-1-yl radical intermediate in the reaction of dioldehydrase. Keywords Mesh Terms:

KEYWORDS: Thallium

MESH TERMS: metabolism

Chemical & Substance for Abstract: Probing interactions from solvent-exchangeable protons and monovalent cations with the 1,2-propanediol-1-yl radical intermediate in the reaction of dioldehydrase. Information

Substance Name: Propanediol Dehydratase

Registry Number: EC 4.2.1.28

Grant and Affiliation Information for Probing interactions from solvent-exchangeable protons and monovalent cations with the 1,2-propanediol-1-yl radical intermediate in the reaction of dioldehydrase.

AFFILIATION: Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53726, USA.

Country: United States

AGENCY: United States NIGMS

GRANT: GM35752

ACRONYM: GM

MEDLINETA: Protein Sci

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