Abstract
Single molecule methods have revealed that heterogeneity is common in biological systems. However, interpretations of the complex signals are challenging. By tracking the fluorescence resonance energy transfer (FRET) signals between the A-site tRNA and L27 protein in single ribosomes, we attempt to develop a qualitative method to subtract the inherent patterns of the heterogeneous single molecule FRET data. Seven ribosome subpopulations are identified using this method and spontaneous exchanges among these subpopulations are observed. All of the pretranslocation subpopulations are competent in real-time translocation, but via distinguished pathways. These observations suggest that the ribosome may function through multiple reaction pathways.
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