کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2053242 | 1074265 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Redox potential of cytochrome c550 in the cyanobacterium Thermosynechococcus elongates
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Redox potential of cytochrome c550 in the cyanobacterium Thermosynechococcus elongates Redox potential of cytochrome c550 in the cyanobacterium Thermosynechococcus elongates](/preview/png/2053242.png)
چکیده انگلیسی
Cytochrome c550 (cyt c550) from photosystem II (PSII) exists in the PSII-bound form but can be released from PSII by treatment with divalent cations or Tris, yielding the isolated form. We calculated heme redox potentials (Em) based on the crystal structures of cyt c550 by solving the Poisson–Boltzmann equation. In the isolated form, the calculated Em are −240 mV at pH 6.0 and −352 mV at pH 9.0. This pH-dependence is predominantly due to deprotonation of the heme-propionic group near Asn-49. In the PSII-bound form, the calculated Em was up-shifted by 160 mV versus the isolated form due to a conformational change of protein backbone, yielding Em = −84 mV.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: FEBS Letters - Volume 579, Issue 14, 6 June 2005, Pages 3190–3194
Journal: FEBS Letters - Volume 579, Issue 14, 6 June 2005, Pages 3190–3194
نویسندگان
Hiroshi Ishikita, Ernst-Walter Knapp,