Ribosome-Associated RNA Identification via Affinity Capture

The patent introduces an intermediary molecule (anti-tag antibody) that bridges the gap between the affinity tag system and native ribosomes. The antibody binds to the affinity tag on ribosomal proteins, enabling RNA identification in modified cells while maintaining the ability to work with standard biochemical techniques. This intermediary approach resolves the contradiction by allowing reliable identification through tags while acknowledging the limitation in native cell applicability.

The patent creates a copy or surrogate system by introducing affinity tags into ribosomal proteins. Instead of directly analyzing native ribosomes, the method uses tagged versions that replicate ribosomal function while adding the necessary identification handle. This copying approach enables reliable RNA identification while accepting that native cells require modification to participate in the system.

The patent replaces the mechanical centrifugation-based sucrose density fractionation system with a biochemical affinity-based purification system. Instead of using density gradients and centrifugal force, the method employs affinity tags and antibodies to specifically capture ribosome-associated RNAs. This substitution maintains high separation precision while dramatically reducing processing time and manual handling requirements.

The patent introduces an intermediary affinity tag system that mediates the separation process. Rather than relying on physical density differences that require lengthy centrifugation, the affinity tag serves as a molecular mediator that enables specific, rapid capture of ribosomal complexes through antibody binding, thus resolving the time-consuming nature of classical fractionation.

The patent creates a modified copy of the ribosome by introducing affinity tags into ribosomal protein sequences. This copied system retains the essential ribosomal function and RNA-binding properties while incorporating the identification handle. The modification allows precise RNA identification while accepting that the native composition is altered, as the tagged ribosomes serve as functional equivalents rather than pristine native structures.

The patent changes a specific parameter of the ribosomal proteins by introducing affinity tag sequences. This parameter change (adding the tag) enables RNA identification capability while minimally affecting the overall ribosomal structure and function. The modification represents a controlled alteration that trades some compositional nativeness for the desired measurement precision.