Tryptophan Fluorescence in the Bacillus subtilis Phototropin‐related Protein YtvA as a Marker of Interdomain Interaction ¶
Tryptophan Fluorescence in the Bacillus subtilis Phototropin‐related Protein YtvA as a Marker of Interdomain Interaction ¶
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枯草芽孢杆菌向光素相关蛋白 YtvA 中的色氨酸荧光作为域间相互作用的标记 ¶
DOI:
10.1111/j.1751-1097.2004.tb00063.x
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发表时间:
2004
影响因子:
3.3
通讯作者:
Gärtner
中科院分区:
文献类型:
--
作者:
Ternelli;Gärtner
TheBacillus subtilisprotein YtvA, related to plant phototropins (phot), binds flavin mononucleotide (FMN) within the N‐terminal light, oxygen and voltage (LOV) domain. The blue light‐triggered photocycle of YtvA and phot involves the reversible formation of a covalent photoadduct between FMN and a cysteine (cys) residue. YtvA contains a single tryptophan, W103, localized on the LOV domain and conserved in all phot‐LOV domains. In this study, we show that the fluorescence parameters of W103 in YtvA‐LOV are markedly different from those observed in the full‐length YtvA. The fluorescence quantum yields areca0.03 and 0.08, respectively. In YtvA‐LOV, the maximum is redshifted (ca345vs335 nm) and the average fluorescence lifetime shorter (2.7vs4.7 ns). These data indicate that W103 is located in a site of tight contact between the two domains of YtvA. In the FMN‐cys adduct, selective excitation of W103 at 295 nm results in minimal changes of the fluorescence parameters with respect to the dark state. On 280 nm excitation, however, there is a detectable decrease in the fluorescence emitted from tyrosines, with concomitant increase in W103 fluorescence. This effect is reversible in the dark and might arise from a light‐regulated energy transfer process from a yet unidentified tyrosine to W103.
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影响因子:
3.1
作者:
Bednarz, T;Losi, A;Heberle, J
通讯作者:
Heberle, J
影响因子:
2.9
作者:
Crosson, S;Rajagopal, S;Moffat, K
通讯作者:
Moffat, K
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
J. Ross;W. Laws;K. Rousslang;H. Wyssbrod
通讯作者:
H. Wyssbrod
影响因子:
2.9
作者:
M. Salomon;Elke Knieb;Tibor von Zeppelin;W. Rüdiger
通讯作者:
W. Rüdiger