Amidationreaction Peptide amidation is a critical post-translational modification that plays a vital role in the biological activity and stability of numerous peptides, particularly peptide hormones and neurotransmitters. This process involves converting a carboxyl group at the C-terminus of a peptide into an amide group. This seemingly small change significantly impacts a peptide's function, often neutralizing negative charge, enhancing receptor binding, and making it less susceptible to proteolytic degradation, thereby increasing its half-life in the bloodstream. Over half of all biologically active peptides and peptide hormones are C-terminally $\alpha$-amidated, underscoring its essentiality for their full biological potency.
The C-terminal carboxyl group of a peptide is typically acidic and can be protonated or deprotonated depending on the surrounding environmentAmidation not only enhances the activity of peptide hormones, but also prolongs their shelf life. The changes reduce the effect of charged C- or N-termini .... By converting this group into an amide (-NH2), peptide amidation alters the peptide's charge and chemical propertiesPeptide amidation. This alteration is crucial for many signaling molecules, as it can improve their interaction with specific receptors. For instance, C-terminal amidation neutralizes the negative charge, which can be essential for effective receptor binding. This modification is not merely an optional enhancement but a fundamental requirement for the biological activity of many neuropeptides and peptide hormonesThis work explores the production of C-terminally amidatedpeptidesfrom unprotected carboxylate precursors using a plant ligase enzyme..
The enzymatic machinery responsible for peptide amidation is complex and well-conserved across species. The primary enzyme involved is peptidylglycine $\alpha$-amidating monooxygenase (PAM).Peptide amidation. - Abstract This enzyme catalyzes a two-step reaction. First, it hydroxylates the C-terminal glycine residue of a precursor peptide, converting it into a hydroxyglycine derivative. Subsequently, this intermediate undergoes cleavage, releasing the C-terminally amidated peptide and glyoxylate.Should My Peptide Be Amidated? This process effectively converts an (n+1)-residue peptide with a C-terminal glycine into an n-residue peptide with a C-terminal amide.This work explores the production of C-terminally amidatedpeptidesfrom unprotected carboxylate precursors using a plant ligase enzyme. The $\alpha$-amidation reaction is a terminal modification in peptide biosynthesis and can sometimes be a rate-limiting step in the overall production of bioactive amidated peptides作者：DB Henriksen·1992·被引用次数：26—A biomimetic C-terminal extension strategy for photocaging amidated neuropeptides. Journal of the American Chemical Society 2023, 145 (36) , 19611-19621..
The primary benefit of peptide amidation is the significant enhancement of biological activity and stability. By increasing resistance to enzymatic breakdown, amidated peptides exhibit longer half-lives, allowing them to exert their physiological effects more effectively. This property makes amidated peptides highly valuable as therapeutic compounds.
Beyond their natural roles, researchers are exploring various ways to leverage peptide amidation. In chemical synthesis, strategies are being developed to produce C-terminally amidated peptides, including the use of small-molecule C-terminal amidation tags. These synthetic approaches aim to replicate the biological advantages of amidation, potentially leading to more stable and potent peptide-based drugs. Furthermore, understanding the enzymes and pathways involved in amidation is crucial for fields like proteomics, enabling more accurate analysis and identification of these important biomolecules作者：A Martínez·1998·被引用次数：7—C-terminalamidationis a post-translational processing step necessary to convey biological activity to a large number of regulatorypeptides..
Peptide amidation is a fundamental post-translational modification that profoundly influences the bioactivity, stability, and receptor interactions of a vast array of peptides. From essential hormones and neurotransmitters to potential therapeutic agents, the conversion of a C-terminal carboxyl group to an amide is a critical step in ensuring their proper function. The enzymatic processes, particularly those mediated by PAM, highlight the sophisticated mechanisms employed by biological systems to fine-tune peptide signaling.作者：P Kaufmann·2021·被引用次数：22—C-terminal α-amidationis the final and essential step in the biosynthesis of severalpeptidehormones. Peptidylglycine α-amidating ... As research continues, the applications of understanding and replicating peptide amidation will undoubtedly expand, offering new avenues for drug development and a deeper insight into biological processes.
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