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Direct protein microsequencing from Immobilon-P Transfer Membrane
1Life Science Applications, Millipore Corporation, Bedford, MA 01730.
Biotechniques
|February 1, 1988
Summary
Directly sequence proteins blotted onto Immobilon-P membranes using gas-phase sequencing. This method bypasses preconditioning steps, saving reagents and time while achieving high protein sequencing yields.
Area of Science:
- Biochemistry
- Proteomics
- Analytical Chemistry
Background:
- Protein sequencing is crucial for identifying and characterizing proteins.
- Traditional methods can be time-consuming and reagent-intensive.
- Immobilon-P Transfer Membrane is a common tool for protein blotting.
Purpose of the Study:
- To evaluate the direct gas-phase sequencing of proteins immobilized on Immobilon-P membranes.
- To assess the efficiency and yield of this direct sequencing approach.
- To explore potential for in situ protein hydrolysis and analysis.
Main Methods:
- Proteins were separated by electrophoresis and electroblotted onto Immobilon-P Transfer Membrane.
- Visualized protein bands were directly placed into a gas-phase sequencer.
- No polybrene was added, and preconditioning cycles were omitted.
- Yields were determined using 125I-labeled beta-lactoglobulin.
Main Results:
- Proteins on Immobilon-P membranes can be directly sequenced in a gas-phase sequencer.
- Eliminating preconditioning steps reduces reagent consumption and instrument time.
- Average initial protein sequencing yields ranged from 70% to 80%.
- Preliminary results show potential for in situ hydrolysis and amino acid analysis.
Conclusions:
- Direct gas-phase sequencing of proteins on Immobilon-P membranes is a viable and efficient method.
- This technique offers significant advantages in terms of time and reagent savings.
- Further characterization of hydrolyzed proteins is possible directly on the membrane.