Can Förster resonance energy transfer measurements uniquely position troponin residues on the actin filament? A case study in multiple-acceptor FRET.
Can Förster resonance energy transfer measurements uniquely position troponin residues on the actin filament? A case study in multiple-acceptor FRET.
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Förster 共振能量转移测量能否将肌钙蛋白残基独特地定位在肌动蛋白丝上?
DOI:
10.1016/s0022-2836(03)00424-8
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发表时间:
2003
影响因子:
5.6
通讯作者:
Cheung,HerbertC
中科院分区:
文献类型:
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作者:
Robinson,JohnM;Dong,Wen-Ji;Cheung,HerbertC
Straightforward interpretation of Förster resonance energy transfer (FRET) data in terms of the distance from donor-labeled troponon-tropomyosin (TnTm) to acceptor-labeled actin is complicated by the potential for energy transfer to acceptors on neighboring actin monomers (cross-transfer). Calculations indicate that cross-transfer can account for a substantial percentage of the total transfer efficiency. In some cases, this renders isolated FRET data uninterpretable. To overcome these limitations, we have developed an analysis method that incorporates cross-transfer and can, in principle, define the most probable (in the “least-squares” sense) position of a TnTm residue on the actin filament. The technique analyzes data from four or more FRET experiments using acceptors attached to different residues on actin. We have used this method to specify the coordinates of skeletal troponin I (sTnI) residue 133 relative to the actin filament under Mg2+and Ca2+-saturating conditions. Ca2+-activation causes the C terminus of the regulatory domain of TnI to move away from the actin surface by 6.3Å, laterally along the actin surface toward actin subdomain 3 by 22.0Å, and azimuthally toward the actin inner domain by 13.2Å. This information is used to construct a low-resolution structural model of thin filament activation.
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影响因子:
--
作者:
Craig,Roger;Lehman,William
通讯作者:
Lehman,William
DOI:
10.1016/s0167-4838(01)00254-0
发表时间:
2001
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
Kobayashi,T;Kobayashi,M;Collins,JH
通讯作者:
Collins,JH
影响因子:
--
作者:
M. L. Johnson;L. M. Faunt
通讯作者:
M. L. Johnson;L. M. Faunt
影响因子:
3
作者:
T. Yasunaga;Y. Suzuki;R. Ohkura;K. Sutoh;T. Wakabayashi
通讯作者:
T. Wakabayashi
DOI:
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发表时间:
--
期刊:
影响因子:
--
作者:
通讯作者:
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