摘要
采用荧光光谱法研究了中华蜜蜂化学感受蛋白3(CSP3)与其特异性配基N-苯基-1-萘胺(N-phenyl-1-naphthylamine,1-NPN)的相互作用.结果表明,1-NPN能使CSP3在λem=328 nm处发生荧光猝灭,且猝灭机理为静态猝灭.另外,猝灭过程的ΔH0>0,ΔS0>0,表明二者间的主要作用力为疏水相互作用.依据F rster非辐射能量转移机制得到二者的结合距离为9.3 nm,能量转移效率E=0.054.采用同步荧光光谱和圆二色光谱考察了1-NPN对CSP3构象的影响,CSP3的荧光主要来源于色氨酸残基,且最大发射波长略有红移,表明结合位点微环境的极性增加,且CSP3的α-螺旋比例相应减少,从而使CSP3构象发生变化.
The molecular interaction of N-phenyl-1-naphthylamine(1-NPN) with purified recombinant Chemosensory proteins 3(CSP3) of Chinese honeybee,Apis cerana cerana,was studied by fluorescence spectra.By static quenching mechanism,1-NPN could quench the intrinsic fluorescence of CSP3 at 328 nm(λem).Thermodynamic analysis show that hydrophobic interaction of 1-NPN with CSP3 was predominant intermolecular force.According to the Frster-type dipole-dipole nonradiative energy-transfer mechanism,the binding distance(r=9.3 nm) and energy-transfer efficiency(E=0.054) bewteen donor(CSP3) and acceptor(1-NPN) were obtained.Synchronous fluorescence spectra and circular dichroism spectra show that the tryptophan contributed primary fluorescent emission.The redshift of λmax and the reduction α-helix indicated that 1-NPN can affect the conformation of CSP3 by increasing the polarity of the microenvironment of binding sites between them.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第6期1284-1288,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:30900163,30571241)
浙江省重大农业科技专项(批准号:2006C12020)
浙江省自然科学基金(批准号:Y307597)资助
关键词
中华蜜蜂
化学感受蛋白
相互作用
荧光光谱
Apis cerana cerana
Chemosensory protein
Interaction
Fluorescence spectroscopy