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PEGA supports for combinatorial peptide synthesis and solid-phase enzymatic library assays
M Renil1, M Ferreras, J M Delaisse
1Department of Chemistry, Carlsberg Laboratory, Valby, Denmark.
Summary
New permeable resins cross-linked with polyethylene glycol (PEG) chains were developed for enzyme library assays. These novel PEGA supports offer tunable properties for synthesizing peptide libraries and efficient substrate identification for enzymes like matrix metalloproteinase MMP-9.
Area of Science:
- Polymer Chemistry
- Biochemistry
- Materials Science
Background:
- Solid-phase synthesis requires robust and versatile polymer supports.
- Existing resins may have limitations in swelling properties or capacity for specific applications.
- Polyethylene glycol (PEG) based resins offer potential for improved performance due to their tunable hydrophilicity and cross-linking capabilities.
Purpose of the Study:
- To synthesize and characterize novel permeable resins (PEGA supports) cross-linked with varying lengths of polyethylene glycol (PEG) chains.
- To evaluate the suitability of these resins for solid-phase enzyme library assays and peptide synthesis.
- To optimize resin properties, including cross-linking, swelling, and amino group capacity, for efficient enzyme substrate identification.
Main Methods:
- Synthesis of high molecular weight bis-amino-polyethylene glycol (PEG) precursors.
- Copolymerization of PEG macromonomers with acrylamide or N,N-dimethylacrylamide using inverse suspension polymerization to create Type I and Type II resins.
- Characterization of resin properties: swelling, size distribution, and amino group capacity.
- Synthesis of fluorescent quenched peptide libraries on the developed PEGA supports.
- Enzyme assays using matrix metalloproteinase MMP-9 and identification of substrates via fluorescence microscopy and sequencing.
- Application of high-loaded resins (Type II) in continuous flow peptide synthesis.
Main Results:
- Successfully synthesized permeable PEGA resins with tunable cross-linking and varying PEG chain lengths (4000, 6000, 8000).
- Resins exhibited good mechanical properties, handling characteristics, and a broad swelling range in various solvents, with no swelling in diethyl ether.
- PEGA resins (Type I) demonstrated amino acid group capacities from 0.07 to 1.0 mmol/g, adjustable by monomer composition.
- Identified specific peptide substrates for matrix metalloproteinase MMP-9 using synthesized libraries on the PEGA supports.
- High-loaded Type II resins yielded peptides in excellent yield and purity via continuous flow synthesis.
Conclusions:
- The developed PEGA resins are versatile and effective supports for solid-phase synthesis, particularly for enzyme library assays.
- Tunable properties of these PEG-cross-linked resins allow for optimization for specific applications, such as enzyme substrate discovery.
- The synthesized resins facilitate efficient identification of enzyme substrates and high-yield peptide synthesis, demonstrating their utility in biochemical research and drug discovery.