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Peptide Bonds

Peptide Bonds

A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...

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What are Proteins?

Proteins are polymers of amino acids linked together by peptide bonds. Proteins and polypeptides are interchangeably used to refer to long chains of amino acids. However, polypeptides have a molecular weight of fewer than 10,000 daltons, while proteins have greater molecular weight. Polypeptides with less than 20 amino acids are called oligopeptides or simply peptides. Interactions among the constituent amino acid side chains of proteins help them fold into a stable 3-dimensional...

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Protein Organization

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence....

Protein Organization

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Protein Digestion

Protein digestion begins in the stomach, where the highly acidic environment can easily disrupt protein structure by exposing the peptide bonds of polypeptide chains. After polypeptide chains are broken into individual amino acids by a series of digestive enzymes, the amino acids are transported to the liver via the bloodstream to produce energy.

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A Tripeptide-Stabilized Nanoemulsion of Oleic Acid

A Tripeptide-Stabilized Nanoemulsion of Oleic Acid

Published on: February 27, 2019

Peptides in proteins.

Benedikt Weber¹, Andreas Maier¹, Johannes Buchner¹

¹Center for Integrated Protein Science Munich at the Department Chemie, Technische Universität München, Garching, Germany.

Journal of Peptide Science : an Official Publication of the European Peptide Society

|December 24, 2019

Summary

This summary is machine-generated.

Evolutionary C-terminal peptide extensions enhance protein functions like interactions and oligomerization. Key examples include immunoglobulin M (IgM) antibodies and molecular chaperones, showcasing their functional significance.

Keywords:

C-terminal extensions Hsp90 IgM TPR co-chaperone peptides proteins tailpiece

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Last Updated: Jan 1, 2026

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Published on: June 30, 2013

Identifying Protein-protein Interaction Sites Using Peptide Arrays

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Published on: November 18, 2014

Area of Science:

Molecular Biology
Evolutionary Biology
Protein Biochemistry

Background:

Proteins undergo evolutionary modifications to acquire new functions.
C-terminal peptide extensions represent a significant evolutionary innovation in protein structure.
These extensions play crucial roles in protein-protein interactions and complex formation.

Purpose of the Study:

To explore the evolutionary origins and functional implications of C-terminal peptide extensions in proteins.
To highlight the role of these extensions in mediating protein interactions and oligomerization.
To discuss prominent examples like immunoglobulin M (IgM) antibodies and molecular chaperones.

Main Methods:

Comparative genomics analysis to identify C-terminal extensions across species.
Bioinformatic tools to predict protein-protein interaction interfaces.
Literature review of well-characterized proteins with known C-terminal extensions.

Main Results:

C-terminal peptide extensions have been acquired during protein evolution at the gene level.
These extensions are critical for enabling specific protein interactions and facilitating oligomerization.
Analysis confirms the widespread functional importance of these extensions in diverse protein families.

Conclusions:

C-terminal peptide extensions are a conserved evolutionary strategy for expanding protein functionality.
Understanding these extensions is key to deciphering protein complex assembly and function.
Immunoglobulin M (IgM) antibodies and molecular chaperones exemplify the functional versatility conferred by C-terminal extensions.