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arXiv 0904.2223physics.bio-phphysics.chem-phq-bio.BM
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蛋白质表面吸附机制的单分子成像

Single-molecule imaging of protein adsorption mechanisms to surfaces

Shannon Kian Zareh, Y. M. Wang

摘要:

蛋白质-表面相互作用引起受控蛋白质吸附到生物装置上的期望效果以及蛋白质结垢的不期望效果。控制蛋白质表面吸附的关键是识别和量化主要吸附机制:(1)在将蛋白质溶液沉积到干燥表面上时发生的吸附和(2)在沉积到湿表面上后发生的吸附。批量测量不能揭示动态蛋白质吸附途径,因此不能区分两种吸附机制。我们实时成像了单个链霉亲和素分子与疏水性熔融二氧化硅表面的相互作用。我们观察了吸附在表面上的蛋白质和表面附近的扩散蛋白质,并分析了它们的吸附动力学。我们的分析表明,蛋白质溶液沉积过程是亚纳摩尔至纳摩尔蛋白质浓度下链霉亲和素吸附到表面上的主要机制。此外,我们发现,亲水性熔融二氧化硅表面可以防止链霉亲和素分子的吸附。

英文摘要:

Protein-surface interactions cause the desirable effect of controlled protein adsorption onto biodevices as well as the undesirable effect of protein fouling. The key to controlling protein-surface adsorptions is to identify and quantify the main adsorption mechanisms: adsorptions that occur (1) while depositing a protein solution onto dry surfaces and (2) after the deposition onto wet surfaces. Bulk measurements cannot reveal the dynamic protein adsorption pathways and thus cannot differentiate between the two adsorption mechanisms. We imaged the interactions of single streptavidin molecules with hydrophobic fused-silica surfaces in real-time. We observed both adsorbed proteins on surfaces and diffusing proteins near surfaces and analyzed their adsorption kinetics. Our analysis shows that the protein solution deposition process is the primary mechanism of streptavidin adsorption onto surfaces at the sub-nanomolar to nanomolar protein concentrations. Furthermore, we found that hydrophilic fused-silica surfaces can prevent the adsorption of streptavidin molecules.

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