Single-molecule imaging of an in vitro-evolved RNA aptamer reveals homogeneous ligand binding kinetics.

Single-molecule imaging of an in vitro-evolved RNA aptamer reveals homogeneous ligand binding kinetics.
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DOI:
10.1021/ja901880v
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发表时间:
2009-07-29
影响因子:
15
通讯作者:
van Oijen AM
van Oijen AM
中科院分区:
化学1区
文献类型:
--
作者:
Elenko MP;Szostak JW;van Oijen AM

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Many studies of RNA folding and catalysis have revealed conformational heterogeneity, metastable folding intermediates, and long-lived states with distinct catalytic activities. We have developed a single-molecule imaging approach for investigating the functional heterogeneity of in vitro-evolved RNA aptamers. Monitoring the association of fluorescently labeled ligands with individual RNA aptamer molecules has allowed us to record binding events over the course of multiple days, thus providing sufficient statistics to quantitatively define the kinetic properties at the single-molecule level. The ligand binding kinetics of the highly optimized RNA aptamer studied here displays a remarkable degree of uniformity and lack of memory. Such homogeneous behavior is quite different from the heterogeneity seen in previous single-molecule studies of naturally derived RNA and protein enzymes. The single-molecule methods we describe may be of use in analyzing the distribution of functional molecules in heterogeneous evolving populations or even in unselected samples of random sequences.
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