peptide c-terminal amidation can reduce the overall charge of the peptide - N-to-Cpeptidesynthesis small-molecule C-terminal amidation tags Understanding Peptide C-Terminal Amidation: A Crucial Modification in Biochemistry

Peptidesynthesis review Peptide c-terminal amidation is a fundamental post-translational modification that plays a significant role in the structure, stability, and biological activity of numerous peptidesShould My Peptide Be Amidated?. This process involves the conversion of the peptide's terminal carboxyl group (-COOH) into a carboxamide group (-CONH2)作者：DJ Merkler·1994·被引用次数：305—Structure-activity data for 45 bioactivepeptidesshow that theC-terminalamide is required for the full biological activity of most amidatedpeptidehormones.. While seemingly a minor chemical alteration, amidating the peptide's C-terminus has profound implications for its function and is observed across a wide range of biological systems作者：A Chaudhary·2025·被引用次数：1—Post-translational modifications, such asC-terminal amidation, are energetically costly but critical for membrane-active antimicrobialpeptides(AMPs)..

The Significance of C-Terminal Amidation

The primary functional consequence of peptide c-terminal amidation is the neutralization of the negative charge typically associated with the free carboxyl group at the C-terminus. This alteration can reduce the overall charge of a peptide, which in turn can influence its solubility and its interactions with other molecules, including cell membranes and receptorsC-terminal amidationcan reduce the overall charge of the peptide, but may reduce the solubility of the peptide. End blocking of the peptide brings it closer to .... For instance, C-terminal amidation is known to significantly impact receptor activation, as seen with hAmylin, where the modification affects its interaction with different Amylin receptors2025年3月26日—As shown in Figures 2(a)-2(d),C-terminus amidation influences the strength of interactionsbetween the peptide tetramers and the bilayer.. Furthermore, this modification promotes the stabilization of the secondary structure of the peptide, often leading to a higher content of helical conformations, as observed in studies of mastoparans.Introduction to N-terminus and C-terminus - Creative Proteomics

Biological Roles and Applications

C-terminal amidation is a common feature of many bioactive peptides, including hormones and neurotransmittersRevealing C-terminal peptide amidation by the use of .... In many cases, it is essential for their biological activity.This work explores the production ofC-terminally amidated peptidesfrom unprotected carboxylate precursors using a plant ligase enzyme. For example, C-terminal amidation is essential to the biological activity of many neuropeptides and hormones. The C-terminal amide is required for the full biological activity of most amidated peptide hormones, and it is considered a signature of bioactivity for many known amidated peptides作者：DJ Merkler·1994·被引用次数：305—Structure-activity data for 45 bioactivepeptidesshow that theC-terminalamide is required for the full biological activity of most amidatedpeptidehormones.. This modification is particularly crucial for membrane-active antimicrobial peptides (AMPs), where it is energetically costly but critical for their function.One-pot and sustainable liquid-phase peptide extension ... The influence of C-terminal amidation on the antimicrobial and hemolytic activities of AMPs has been extensively studied, highlighting its direct impact on their efficacy.

Beyond its natural occurrence, peptide c-terminal amidation is also an important consideration in peptide synthesis and drug development. The ability to synthesize C-terminally amidated peptides is crucial for producing biologically active peptide analogsPeptide Modifications: N-Terminal, Internal, and C-Terminal. Various chemical and enzymatic methods have been developed to achieve this. Chemically, reagents like liquid ammonia or ammonium chloride, or more specifically NH4Cl, alkylammonium chloride (RNH3Cl) and semicarbazide hydrochloride, have been employed for amidation reactionsComprehensive Guide to Peptide C-Terminal Modifications. Innovations in chemical synthesis include the development of small-molecule C-terminal amidation tags based on phosphonate or aliphatic moieties, offering efficient ways to achieve this modification作者：H Li·2023·被引用次数：2—In this study, we present a series ofsmall-molecule C-terminal amidation tagsbased on phosphonate or aliphatic moieties. These tags were ....

Enzymatic approaches also play a vital role. Peptide amidases catalyze the selective hydrolysis of the C-terminal carboxamide groups, underscoring the existence of enzymes specifically involved in these modificationsC-Terminal Modification of Peptides. Research continues into developing efficient enzymatic methods for C-terminal amidation, utilizing enzymes like plant ligases to produce C-terminally amidated peptides from unprotected carboxylate precursors.

Chemical Considerations and Challenges

The process of peptide c-terminal amidation is not without its complexities. While it can reduce the overall charge of the peptide, it may also reduce the solubility of the peptide. This trade-off needs careful consideration during peptide design and synthesis. The modification also ensures that the C-terminal of the peptide is synthesized as an amide, effectively neutralizing the potential negative charge.Peptide Modifications: N-Terminal, Internal, and C-Terminal

From a research perspective, accurately identifying and characterizing amidated peptides is important. Techniques that can reveal C-terminal peptide amidation are valuable for understanding peptide biology. The development of methods for C-terminal protein sequencing and modifications, including N-terminal acetylation and C-terminal amidation, contributes to a comprehensive understanding of peptide chemistry.

In summary, peptide c-terminal amidation is a vital biochemical process that significantly impacts peptide properties作者：MI Arif·2018·被引用次数：2—Peptide amidases catalyze the selective hydrolysis of the C-terminal carboxamide groupspresent on peptide amides and possess a broad substrate specificity.. Its role in enhancing stability, modulating charge, and ensuring biological activity makes it a critical area of study in biochemistry, pharmacology, and synthetic chemistry. Whether through natural biological pathways or synthetic strategies, understanding and controlling peptide c-terminal amidation remains crucial for advancing our knowledge and applications of peptides.