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求教两篇文章： 1： COLLECTION of Czechoslovak Chemical Communications的 1960 年第25卷从1694起到哪一页止？. 作者：M.Adamek 2：, Comments Inorganic Chemistry(1990). 第11卷, 131页起到哪一页止？. 作者：M.C. Feitrers [ Last edited by B52 on 2007-11-28 at 19:52 ] |
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X-Ray Absorption Spectroscopic Studies of Metal Coordination in Zinc and Copper Proteins Author: M. C. Feiters a Affiliation: a Department of Organic Chemistry, Catholic University OJ Nijmegern, Toernooiveld, Nijmegen, The Netherlands DOI: 10.1080/02603599008035822 Publication Frequency: 6 issues per year Published in: Comments on Inorganic Chemistry, Volume 11, Issue 2 & 3 December 1990 , pages 131 - 174 Subject: Inorganic Chemistry; Formats available: PDF (English) Article Requests: Order Reprints : Request Permissions Purchase Article: US$32.00 - buy now add to cart [ show other buying options ] purchase type customer type online access payment method price Single Article Purchase Personal 3 days credit card US$32.00 buy now add to cart Issue Purchase Any permanent credit card US$156.94 buy now add to cart If you would like to pay in any other currency please see the purchasing help pages for more information. Sign In Online Sample Abstract X-ray absorption spectroscopic studies have contributed to the elucidation of the metal coordination in zinc and copper proteins, and to the refinement of structures of such proteins already known from crystallographic studies. Zinc proteins can be classified according to their X-ray absorption spectroscopic characteristics, and it is possible to discriminate between ligand environments with two sulfur ligands, as in the transcription factor, and with one sulfur ligand, as in the sorbitol dihydrogenase, in a comparative study. For phospholipase C, it has been shown in a substitution study that cobalt has a higher coordination number than the native zinc in the same size. Comparisons of the copper - ligand interactions of various electron transfer or "blue-copper" proteins do not show a clear correlation with redox potential except perhaps for the relative rigidity of the Cu - S distances in that with the highest redox potential, rusticyanin. EXAFS (extended X-ray absorption fine structure) studies of type-2 copper enzymes are critically reexamined in view of the possibility that coordination by the recently discovered o-quinoline cofactors has been mistaken for imidazole coordination. Changes in the copper coordination of the dinuclear copper site in hemocyanin upon oxygen binding are interpreted in terms of the coordination of one additional imidazole ligand per copper. Keywords: X-ray absorption spectroscopy; extended X-ray absorption fine structure (EXAFS); zinc; cobalt; copper; NAD-dependent dehydrogenase; -lactamase; phospholipase C; blue copper; type-2 copper; pyrrolo quinoline quinone (PQQ); dinuclear copper site view references (204) |
2楼2007-11-28 18:10:46
