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Fakultät für Physik


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Impressum
(c) 2002 BMO

"A new method to determine the structure of the metal environment in metalloproteins: investigation of the prion protein octapeptide repeat Cu2+ complex"
Matthias Mentler, Andreas Weiss, Klaus Grantner, Pablo del Pino, Dominga Deluca, Stella Fiori, Christian Renner, Wolfram Meyer Klaucke, Luis Moroder, Uwe Bertsch, Hans A. Kretzschmar, Paul Tavan, Fritz G. Parak
Eur. Biophys. J. 34, 97-112 (2005).


Abstract:
Since high-intensity synchrotron radiation is available, ‘‘extended X-ray absorption fine structure’’ spectroscopy (EXAFS) is used for detailed structural analysis of metal ion environments in proteins. However, the information acquired is often insufficient to obtain an unambiguous picture. ENDOR spectroscopy allows the determination of hydrogen positions around a metal ion. However, again the structural information is limited. In the present study, a method is proposed which combines computations with spectroscopic data from EXAFS, EPR, electron nuclear double resonance (ENDOR) and electron spin echo envelope modulation (ESEEM). From EXAFS a first picture of the nearest coordination shell is derived which has to be compatible with EPR data. Computations are used to select sterically possible structures, from which in turn structures with correct H and N positions are selected by ENDOR and ESEEM measurements. Finally, EXAFS spectra are re-calculated and compared with the experimental data. This procedure was successfully applied for structure determination of the Cu2+ complex of the octapeptide repeat of the human prion protein. The structure of this octarepeat complex is rather similar to a pentapeptide complex which was determined by X-ray structure analysis. However, the tryptophan residue has a different orientation: the axial water is on the other side of the Cu.

BMO authors (in alphabetic order):
Paul Tavan
Andreas Weiss

Assoziierte Projekte:
Computation of structure, electrostatics, and conformational dynamics of PrPC induced by binding of Cu(II)


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Letzte Änderung: 2016-09-14 11:34