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What is a peptide? Is there any effect? In several categories?
Speaking of amino acids, proteins, fats, carbohydrates, everyone may be more clear, but you may know less about "peptides."
Today, nutrition sister will come with you to learn about the magic peptides.
What kind of functionality does it have?
The amino group of one amino acid and the carboxyl group of another amino acid can be condensed into a peptide, and the formed amide group is called a peptide bond in protein chemistry. It is a substance between amino acids and proteins.
2, the classification of peptides
Dipeptides: peptides formed by the dehydration condensation of two amino acids, and so on, tripeptides, tetrapeptides, pentapeptides, and the like.
Oligopeptides: peptides formed by the dehydration condensation of 10 or less amino acids.
Polypeptides: peptides formed by the dehydration condensation of 10 or more amino acids; there are no strict differences between polypeptides and proteins, all are amino acid polymers, polypeptides refer to polymers containing fewer amino acids, and proteins contain amino acids. A large number of polymers.
Amino acid residues: Amino acid molecules in the peptide chain are incomplete due to dehydration condensation and are called amino acid residues.
Polypeptide chain: refers to a structure in which many amino acids are linked by peptide bonds. The polypeptide chain has two ends, the N-terminus: one end having a free amino group in the polypeptide chain; and the C-terminus: one end having a free carboxyl group in the polypeptide chain.
According to the amino acid residues involved in its composition, it is determined that starting from the NH2 terminal amino acid residue of the peptide chain, it is called an aminoacyl amino acid ... an amino acid, and always put the NH2 terminal amino acid residue on the left, COOH The terminal amino acid residue is placed on the right, for example, Ser-Gly-Tyr-Ala-Leu, which is called Seryl Glycyl Tyrosine Alanyl Leucine, and the serine residue is NH2-terminal, Leucine residue. The side is the COOH end; note that the reversed Leu-Ala-Tyr-Gly-Ser is a different pentapeptide.
3, active peptide
In addition to the various peptides in the body that can produce various lengths of protein in the body, there are many oligopeptides or polypeptides that are free, with a variety of special biological activity, called active peptides.
Biological growth, development, cell differentiation, brain function, immunity, reproduction, senescence, and lesions all involve active peptides;
Active peptides are the main chemical messenger for communication inside cells, between cells, and between organs; many hormones and antibiotics belong to the peptide or peptide derivatives.
At present, it has become a research hotspot in the world, and a large number of domestic and foreign research results show that biologically active peptides are biologically active substances involved in a variety of cell functions in vivo, and hundreds of them have been found in living organisms. Different biological peptides have different Structural and physiological functions such as antiviral, anticancer, antithrombotic, antihypertensive, immunoregulatory, hormonal regulation, bacteriostasis, cholesterol lowering, etc. Placenta is also a kind of active peptide.
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