Fluorescence determination of tryptophan side-chain accessibility and dynamics in triple-helical collagen-like peptides.
Fluorescence determination of tryptophan side-chain accessibility and dynamics in triple-helical collagen-like peptides.
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三螺旋胶原蛋白样肽中色氨酸侧链可及性和动力学的荧光测定。
DOI:
10.1016/s0006-3495(03)74869-3
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发表时间:
2003
影响因子:
3.4
通讯作者:
Ludescher,RichardD
中科院分区:
文献类型:
--
作者:
Simon-Lukasik,KristineV;Persikov,AntonV;Brodsky,Barbara;Ramshaw,JohnAM;Laws,WilliamR;AlexanderRoss,JB;Ludescher,RichardD
We report tryptophan fluorescence measurements of emission intensity, iodide quenching, and anisotropy that describe the environment and dynamics at X and Y sites in stable collagen-like peptides of sequence (Gly-X-Y)n. About 90% of tryptophans at both sites have similar solvent exposed fluorescence properties and a lifetime of 8.5–9ns. Analysis of anisotropy decays using an associative model indicates that these long lifetime populations undergo rapid depolarizing motion with a 0.5ns correlation time; however, the extent of fast motion at the Y site is considerably less than the essentially unrestricted motion at the X site. About 10% of tryptophans at both sites have a shorter (∼3ns) lifetime indicating proximity to a protein quenching group; these minor populations are immobile on the peptide surface, depolarizing only by overall trimer rotation. Iodide quenching indicates that tryptophans at the X site are more accessible to solvent. Side chains at X sites are more solvent accessible and considerably more mobile than residues at Y sites and can more readily fluctuate among alternate intermolecular interactions in collagen fibrils. This fluorescence analysis of collagen-like peptides lays a foundation for studies on the structure, dynamics, and function of collagen and of triple-helical junctions in gelatin gels.
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影响因子:
2.9
作者:
Waxman,E;Laws,WR;Laue,TM;Nemerson,Y;Ross,JB
通讯作者:
Ross,JB
影响因子:
56.9
作者:
BELLA, J;EATON, M;BERMAN, HM
通讯作者:
BERMAN, HM
DOI:
10.1111/j.1399-3011.1977.tb03485.x
发表时间:
2009
期刊:
International journal of peptide and protein research
影响因子:
--
作者:
M. Bansal
通讯作者:
M. Bansal
影响因子:
3
作者:
Ramshaw, JAM;Shah, NK;Brodsky, B
通讯作者:
Brodsky, B
影响因子:
6.8
作者:
Baum, Jean;Brodsky, Barbara
通讯作者:
Brodsky, Barbara