Both Met(109) and Met(112) are utilized for Cu(II) coordination by the amyloidogenic fragment of the human prion protein at physiological pH.
Both Met(109) and Met(112) are utilized for Cu(II) coordination by the amyloidogenic fragment of the human prion protein at physiological pH.
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Met(109) 和 Met(112) 均在生理 pH 值下被人朊病毒蛋白的淀粉样蛋白片段用于 Cu(II) 配位。
DOI:
10.1016/j.jinorgbio.2008.07.016
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发表时间:
2008
影响因子:
3.9
通讯作者:
Lentz,Stefanie
中科院分区:
文献类型:
--
作者:
Shearer,Jason;Soh,Pamela;Lentz,Stefanie
The prion protein is a ubiquitous neuronal membrane protein. Misfolding of the prion protein has been implicated in transmissible spongiform encephalopathies (prion diseases). It has been demonstrated that the human prion protein (PrP) is capable of coordinating at least five CuIIions under physiological conditions; four copper binding sites can be found in the octarepeat domain between residues 61 and 91, while another copper binding site can be found in the unstructured “amyloidogenic” domain between residues 91 and 126 PrP(91–126). Herein we expand upon a previous study [J. Shearer, P. Soh, Inorg. Chem. 46 (2007) 710–719] where we demonstrated that the physiologically relevant high affinity CuIIcoordination site within PrP(91–126) is found between residues 106 and 114. It was shown that CuIIis contained within a square planar (N/O)3S coordination environment with one His imidazole ligand (H(111)) and one Met thioether ligand (either M(109) or M(112)). The identity of the Met thioether ligand was not identified in that study. In this study we perform a detailed investigation of the CuIIcoordination environment within the PrP fragment containing residues 106–114 (PrP(106–114)) involving optical, X-ray absorption, EPR, and fluorescence spectroscopies in conjunction with electronic structure calculations. By using derivatives of PrP(106–114) with systematic Met→Ile “mutations” we show that the CuIIcoordination environment within PrP(106–114) is actually comprised of a mixture of two major species; one CuII(N/O)3S center with the M(109) thioether coordinated to CuIIand another CuII(N/O)3S center with the M(112) thioether coordinated to CuII. Furthermore, deletion of one or more Met residues from the primary sequence of PrP(106–114) both reduces the CuIIaffinity of the peptide by two to seven fold, and renders the resulting CuIImetallopeptides redox inactive. The biological implications of these findings are discussed.
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影响因子:
3
作者:
Neese, Frank
通讯作者:
Neese, Frank
影响因子:
4.6
作者:
J. Shearer;P. Soh
通讯作者:
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3.2
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Max Nunziante;S. Gilch;H. Schätzl
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通讯作者:
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