Peptides are short chains of amino acids (the "building blocks" of proteins) linked by peptide bonds. They are smaller than proteins, typically containing between 2 and 50 amino acids.
Core Characteristics
Structure: They consist of two or more amino acids.
Oligopeptides: Chains of 2–20 amino acids (e.g., dipeptides, tripeptides).
Polypeptides: Longer, unbranched chains typically containing more than 20 amino acids.
Formation: Created when the carboxyl group of one amino acid reacts with the amino group of another, releasing a water molecule in a dehydration reaction.
Peptide vs. Protein: The primary difference is size; proteins are larger macromolecules (usually 50+ amino acids) with complex three-dimensional folding.
Key Biological Functions
Peptides act primarily as signaling molecules or "messengers" that instruct cells to perform specific tasks.
Hormones: Regulate vital processes like metabolism and growth. Insulin (51 amino acids) is a classic example that regulates blood sugar.
Neuropeptides: Act as neurotransmitters or modulators in the nervous system to regulate mood, pain, and appetite (e.g., endorphins, oxytocin).
Antimicrobial Peptides (AMPs): Part of the innate immune system, they protect the body by killing bacteria, fungi, and viruses.
Enzyme Inhibitors: Regulate biochemical reactions by blocking specific enzymes, helping to maintain homeostasis.
Applications and Benefits
Skincare: Peptides like collagen peptides signal the skin to produce more collagen and elastin, helping to firm skin and reduce wrinkles.
Medicine: Over 100 peptide drugs are FDA-approved to treat conditions like diabetes (Semaglutide/Ozempic), osteoporosis, and cancer due to their high specificity and low toxicity.
Fitness & Health: Supplements like creatine peptides and collagen are used to support muscle growth, bone density, and joint repair.
If you tell me what you're most interested in, I can provide more specific details:
The exact mechanism of a particular peptide (like insulin or GLP-1)
A full list of common peptide-based medications
How to read product labels for skincare peptides (like "palmitoyl")
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