Accelerated trypsin autolysis by affinity polymer templates

Area of Science:

• Biochemistry
• Polymer Chemistry
• Enzymology

Background:

• Protein self-cleavage (autolysis) is a natural process challenging to control externally.
• Previous methods for accelerated trypsin autolysis used non-specific polymers, limiting effectiveness at high salt concentrations.

Purpose of the Study:

• To develop specific affinity copolymers for controlled protease self-cleavage.
• To investigate the mechanism of polymer-assisted self-digest (PAS) for enhanced trypsin inhibition.

Main Methods:

• Synthesis of affinity copolymers targeting specific amino acid residues on proteases.
• Characterization of trypsin inhibition using techniques like SDS-PAGE, gel filtration, CD, CZE, and ESI-MS.
• Development of a theoretical model to explain templating and multivalency effects.

Main Results:

• Affinity copolymers demonstrated highly efficient trypsin inhibition with low nanomolar IC50 values under physiological conditions.
• The PAS mechanism was confirmed, showing accelerated autolysis due to templating and increased local protease concentration.
• Mass spectrometric kinetic analysis provided mechanistic insights into polymer-bound trypsin's rapid, low-specificity cleavage.

Conclusions:

• Specific affinity copolymers offer a novel and efficient method for controlling protease activity via polymer-assisted self-digest.
• The PAS mechanism provides a controllable approach to protease inhibition, overcoming limitations of previous methods.
• This study advances the understanding of enzyme-polymer interactions and templating effects in biological systems.