Aggregation Behavior of pHLIP in Aqueous Solution at Low Concentrations: A Fluorescence Study

Aggregation Behavior of pHLIP in Aqueous Solution at Low Concentrations: A Fluorescence Study
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pHLIP 在低浓度水溶液中的聚集行为:荧光研究

DOI:
10.1007/s10895-018-2260-1
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发表时间:
2018
影响因子:
2.7
通讯作者:
A. Chattopadhyay
A. Chattopadhyay
中科院分区:
化学4区
文献类型:
--
作者:
B. D. Rao;H. Chakraborty;S. Keller;A. Chattopadhyay

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pH(低)插入肽(pHLIP)是一种36个残基的肽,来源于膜蛋白细菌视紫红质的第三个跨膜螺旋。这种肽的疏水性使其即使在低浓度下也易于聚集,但尚未详细研究。在这项工作中,我们使用基于荧光的方法,并辅以圆二色性(CD)光谱,在水溶液(pH 8)中,在低浓度(~μM)的单体和聚集形式的pHLIP。我们在这里显示,单体和聚集的pHLIP显示差分红边激发位移(REES)和CD光谱。这些光谱特征使我们能够表明,即使在低浓度下,pHLIP聚集体。详细了解pHLIP在这些条件下的聚集行为将有助于监测和量化其与膜的相互作用。
pH (low) insertion peptide (pHLIP) is a 36-residue peptide derived from the third transmembrane helix of the membrane protein bacteriorhodopsin. The hydrophobicity of this peptide makes it prone to aggregation even at low concentrations, but this has not been studied in detail. In this work, we characterized monomeric and aggregated forms of pHLIP in aqueous solution (pH 8) at low concentrations (~μM) using fluorescence-based approaches, complemented by circular dichroism (CD) spectroscopy. We show here that monomeric and aggregated pHLIP display differential red edge excitation shift (REES) and CD spectra. These spectroscopic features allowed us to show that pHLIP aggregates even at low concentrations. A detailed knowledge of the aggregation behavior of pHLIP under these conditions will be useful for monitoring and quantifying its interaction with membranes.
DOI: 10.1073/pnas.0601463103
发表时间: 2006-04-25
影响因子: 11.1
作者:
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