Synthesizing long-chain peptides (typically defined as sequences >50 amino acids) presents unique challenges that require specialized expertise and technology. Our synthesis capabilities extend up to 189 amino acids, enabling the production of challenging targets including membrane proteins, large bioactive peptides, and protein domains.
Long-chain peptide synthesis faces several challenges. Coupling efficiency tends to decrease as chain length increases, leading to truncated sequences and reduced yields. Purification becomes more difficult as the number of potential impurities increases. Aggregation of the growing peptide chain on the resin can also reduce yield and complicate synthesis.
To address these challenges, we employ specialized techniques including optimized coupling conditions, enhanced washing protocols, and specialized resins designed for long-chain synthesis. Our experienced chemists monitor synthesis progress and adjust conditions as needed to maintain high coupling efficiency throughout the synthesis.
Purification of long-chain peptides typically requires multiple chromatography steps to achieve target purity. We use preparative HPLC with optimized gradients to separate the target peptide from closely related impurities. For particularly challenging purifications, we may employ additional techniques such as ion exchange chromatography or size exclusion chromatography.
Long-chain peptides have important applications in research and drug development. They are used to study protein-protein interactions, as tools for structural biology, and as therapeutic candidates for diseases where shorter peptides are ineffective. Our capability to synthesize long-chain peptides enables researchers to explore these important areas of investigation.