التفاصيل البيبلوغرافية
| العنوان: |
Mechanism of Absorption Wavelength Shift Depending on the Protonation State of the Acrylate Group in Chlorophyll c |
| المؤلفون: |
Masaki Tsujimura (9147607), Minaka Sugano (14341358), Hiroshi Ishikita (199546), Keisuke Saito (516747) |
| سنة النشر: |
2023 |
| مصطلحات موضوعية: |
Biophysics, Cell Biology, Molecular Biology, Physiology, Ecology, Cancer, Inorganic Chemistry, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, dissipation modes depending, >- binding protein, molecular mechanical approach, light conditions leads, harvesting antenna proteins, calculated absorption wavelength, absorption wavelength, quantum mechanical, use light, soret band, results suggest, red shift, porphyrin ring, lumenal side, light intensity, green region, changes upon, changes owing, candidate component, acrylate group |
| الوصف: |
Diatoms can use light in the blue-green region because they have chlorophyll c (Chl c ) in light-harvesting antenna proteins, fucoxanthin and chlorophyll a / c -binding protein (FCP). Chl c has a protonatable acrylate group (–CHCH–COOH/COO – ) conjugated to the porphyrin ring. As the absorption wavelength of Chl c changes upon the protonation of the acrylate group, Chl c is a candidate component that is responsible for photoprotection in diatoms, which switches the FCP function between light-harvesting and energy-dissipation modes depending on the light intensity. Here, we investigate the mechanism by which the absorption wavelength of Chl c changes owing to the change in the protonation state of the acrylate group, using a quantum mechanical/molecular mechanical approach. The calculated absorption wavelength of the Soret band of protonated Chl c is ∼25 nm longer than that of deprotonated Chl c , which is due to the delocalization of the lowest (LUMO) and second lowest (LUMO+1) unoccupied molecular orbitals toward the acrylate group. These results suggest that in FCP, the decrease in pH on the lumenal side under high-light conditions leads to protonation of Chl c and thereby a red shift in the absorption wavelength. |
| نوع الوثيقة: |
dataset |
| اللغة: |
unknown |
| Relation: |
https://figshare.com/articles/dataset/Mechanism_of_Absorption_Wavelength_Shift_Depending_on_the_Protonation_State_of_the_Acrylate_Group_in_Chlorophyll_i_c_i_/21831872 |
| DOI: |
10.1021/acs.jpcb.2c07232.s002 |
| الاتاحة: |
https://doi.org/10.1021/acs.jpcb.2c07232.s002 |
| Rights: |
CC BY-NC 4.0 |
| رقم الانضمام: |
edsbas.BB60103A |
| قاعدة البيانات: |
BASE |