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10.1021/acs.jpcb.7b06826 http://scihub22266oqcxt.onion/10.1021/acs.jpcb.7b06826 C5705941!5705941 !28851219     free     free     free Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\28851219 .jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117       J+Phys+Chem+B 2017 ; 121 (38 ): 8935-8945 Nephropedia Template TP {{tp|p=28851219 |t=2017. Not All ?-Sheets Are the Same: Amyloid Infrared Spectra, Transition Dipole Strengths, and Couplings Investigated by 2D IR Spectroscopy |pdf=|usr=}}{{28851219 }} gab.com Text Not All -Sheets Are the Same: Amyloid Infrared Spectra, Transition Dipole Strengths, and Couplings Investigated by 2D IR Spectroscopy JO: J Phys Chem B http://www.kidney.de/pget.php?&tw=1&pmid=28851219 #FOAvip We report the transition dipole strengths and frequencies of the amyloid ?-sheet amide I mode for the aggregated proteins amyloid-?(1-40), calcitonin, ?-synuclein, and glucagon. According to standard vibrational coupling models for proteins, the frequencies of canonical ?-sheets are set by their size and structural and environmental disorder, which determines the delocalization length of the vibrational excitons. The larger the delocalization the lower the frequency of the main infrared-allowed transition, A(?). The models also predict an accompanying increase in transition dipole strength. For the proteins measured here, we find no correlation between transition dipole strengths and amyloid ?-sheet transition frequency. To understand this observation, we have extracted from the protein data bank crystal structures of amyloid peptides from which we calculate the amide I vibrational couplings, and we use these in a model ?-sheet Hamiltonian to simulate amyloid vibrational spectra. We find that the variations in amyloid ?-sheet structures (e.g., dihedral angles, interstrand distances, and orientations) create significant differences in the average values for interstrand and nearest neighbor couplings, and that those variations encompass the variation in measured A(?) frequencies. We also find that off-diagonal disorder about the average values explains the range of transition dipole strengths observed experimentally. Thus, we conclude that the lack of correlation between transition dipole-strength and frequency is caused by variations in amyloid ?-sheet structure. Taken together, these results indicate that the amide I frequency is very sensitive to amyloid ?-sheet structure, the ?-sheets of these 4 proteins are not identical, and the assumption that frequency of amyloids scales with ?-sheet size cannot be adopted without an accompanying measurement of transition dipole strengths. Twit Text FOAVip Not All -Sheets Are the Same: Amyloid Infrared Spectra, Transition Dipole Strengths, and Couplings Investigated by 2D IR Spectroscopy ????J Phys Chem B http://www.kidney.de/pget.php?&tw=1&pmid=28851219 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=28851219 #FOAvip English Wikipedia <ref>{{Cite pmid|28851219 }}</ref> Not All ?-Sheets Are the Same: Amyloid Infrared Spectra, Transition Dipole Strengths, and Couplings Investigated by 2D IR Spectroscopy #MMPMID28851219 Lomont JP ; Ostrander JS ; Ho JJ ; Petti MK ; Zanni MT J Phys Chem B 2017[Sep]; 121 (38 ): 8935-8945 PMID28851219 show ga We report the transition dipole strengths and frequencies of the amyloid ?-sheet amide I mode for the aggregated proteins amyloid-?(1-40), calcitonin, ?-synuclein, and glucagon. According to standard vibrational coupling models for proteins, the frequencies of canonical ?-sheets are set by their size and structural and environmental disorder, which determines the delocalization length of the vibrational excitons. The larger the delocalization the lower the frequency of the main infrared-allowed transition, A(?). The models also predict an accompanying increase in transition dipole strength. For the proteins measured here, we find no correlation between transition dipole strengths and amyloid ?-sheet transition frequency. To understand this observation, we have extracted from the protein data bank crystal structures of amyloid peptides from which we calculate the amide I vibrational couplings, and we use these in a model ?-sheet Hamiltonian to simulate amyloid vibrational spectra. We find that the variations in amyloid ?-sheet structures (e.g., dihedral angles, interstrand distances, and orientations) create significant differences in the average values for interstrand and nearest neighbor couplings, and that those variations encompass the variation in measured A(?) frequencies. We also find that off-diagonal disorder about the average values explains the range of transition dipole strengths observed experimentally. Thus, we conclude that the lack of correlation between transition dipole-strength and frequency is caused by variations in amyloid ?-sheet structure. Taken together, these results indicate that the amide I frequency is very sensitive to amyloid ?-sheet structure, the ?-sheets of these 4 proteins are not identical, and the assumption that frequency of amyloids scales with ?-sheet size cannot be adopted without an accompanying measurement of transition dipole strengths. |Amyloid beta-Peptides/*chemistry [MESH] |Calcitonin/*chemistry [MESH] |Glucagon/*chemistry [MESH] |Humans [MESH] |Models, Molecular [MESH] |Peptide Fragments/*chemistry [MESH] |Protein Conformation, beta-Strand [MESH] |Spectrophotometry, Infrared/methods [MESH]Not All ?-Sheets Are the Same: Amyloid Infrared Spectra, Transition Di(epmc).pdf DeepDyve Pubget Overpricing