Polypeptide for Sale

Polypeptide is a peptide, such as a small protein, containing many molecules of amino
acids, typically between 10 and 100. It consists of 2 or more amino acids. The
PolyPeptide Group is a world leader in the industrial/commercial-scale manufacture of
proprietary and generic GMP and non-GMP peptides.
The amino acids are linked covalently by peptide bonds. The graphic on the right shows
how three amino acids are linked by peptide bonds into a tripeptide.One end of every
polypeptide, called the amino terminal or N-terminal, has a free amino group. The other
end, with its free carboxyl group, is called the carboxyl terminal or C-terminal.
The sequence of amino acids in a polypeptide is dictated by the codons in the messenger
RNA (mRNA) molecules from which the polypeptide was translated. The sequence of codons in
the mRNA was, in turn, dictated by the sequence of codons in the DNA from which the mRNA
was transcribed. The schematic below shows the N-terminal at the upper left and the C-
terminal at the lower right.
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