English  |  正體中文  |  简体中文  |  Items with full text/Total items : 63273/95970 (66%)
Visitors : 4899616      Online Users : 258
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/61695

    Title: Protein-coenzyme Interactions in adenosylcobalamin-dependent glutamate mutase
    Authors: Huhta, M.S.;Chen, H.P.;Hemann, C.;Hille, C.R.;Marsh, E.N.
    Contributors: 淡江大學化學學系
    Keywords: Enzyme;Resonance Raman spectroscopy;Vitamin B 12
    Date: 2001-07
    Issue Date: 2013-05-31 11:34:29 (UTC+8)
    Publisher: London: Portland Press
    Abstract: Glutamate mutase catalyses an unusual isomerization involving free-radical intermediates that are generated by homolysis of the cobalt-carbon bond of the coenzyme adenosylcobalamin (coenzyme B(12)). A variety of techniques have been used to examine the interaction between the protein and adenosylcobalamin, and between the protein and the products of coenzyme homolysis, cob(II)alamin and 5'-deoxyadenosine. These include equilibrium gel filtration, isothermal titration calorimetry, and resonance Raman, UV-visible and EPR spectroscopies. The thermodynamics of adenosylcobalamin binding to the protein have been examined and appear to be entirely entropy-driven, with DeltaS=109 J.mol(-1).K(-1). The cobalt-carbon bond stretching frequency is unchanged upon coenzyme binding to the protein, arguing against a ground-state destabilization of the cobalt-carbon bond of adenosylcobalamin by the protein. However, reconstitution of the enzyme with cob(II)alamin and 5'-deoxyadenosine, the two stable intermediates formed subsequent to homolysis, results in the blue-shifting of two of the bands comprising the UV-visible spectrum of the corrin ring. The most plausible interpretation of this result is that an interaction between the protein, 5'-deoxyadenosine and cob(II)alamin introduces a distortion into the ring corrin that perturbs its electronic properties.
    Relation: Biochemical Journal 355(1), pp.131-137
    DOI: 10.1042/0264-6021:3550131
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

    Files in This Item:

    File SizeFormat
    Protein-coenzyme Interactions in adenosylcobalamin-dependent glutamate mutase.html0KbHTML24View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback