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Automated subpicomole protein sequencing using an alternative postcleavage conversion chemistry
1Beckman Instruments, Inc., Fullerton, California 92634.
Analytical Biochemistry
|December 1, 1993
Summary
A new automated protein sequencing method enhances sensitivity by converting Edman degradation products into easily detectable amino acid derivatives. This approach improves upon current strategies without requiring hardware or chemistry modifications.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Proteomics
Background:
- Classical Edman degradation is a cornerstone of protein sequencing.
- Current high-sensitivity methods may require specialized equipment or complex chemistry.
- There is a need for improved sensitivity in automated protein sequencing.
Purpose of the Study:
- To describe a novel automated subpicomole protein sequencing method.
- To enhance the detectability of amino acid derivatives from Edman degradation.
- To provide a more sensitive alternative to existing protein sequencing strategies.
Main Methods:
- Development of a new chemistry for Edman degradation postcleavage products.
- Conversion of anilinothiazolinone (ATZ), phenylthiocarbamyl (PTC), and phenylthiohydantoin (PTH) into a homogeneous ATZ preparation.
- Reaction of ATZ with sensitivity-enhancing compounds like fluorescent amines.
Main Results:
- Demonstration of the method using alpha-lactalbumin with a known sequence.
- Achieved subpicomole sequencing sensitivity.
- Showed significant improvement over current high-sensitivity protein sequencing strategies.
Conclusions:
- The described automated method offers enhanced sensitivity for protein sequencing.
- No modifications to existing sequencer hardware or Edman degradation chemistry are necessary.
- This technique represents a significant advancement in automated protein analysis.