Detailed Product Description

Name:Nisin
Synonyms:L-Isoleucyl-(Z)-2,3-didehydro-2-aminobutanoyl-D-cysteinyl-L-isoleucyl-2,3-didehydroalanyl-L-leucyl-L-cysteinyl-threo-3-mercapto-D-2-aminobutanoyl-L-prolylglycyl-L-cysteinyl-L-lysyl-threo-3-mercapto-D-2-aminobutanoylglycyl-L-alanyl-L-leucyl-L-methionylglycyl-L-cysteinyl-L-asparaginyl-L-methionyl-L-lysyl-threo-3-mercapto-D-2-aminobutanoyl-L-alanyl-threo-3-mercapto-D-2-aminobutanoyl-L-cysteinyl-L-histidyl-L-cysteinyl-L-seryl-L-isoleucyl-L-histidyl-L-valyl-2,3-didehydroalanyl-L-lysinecyclic(3->7),(8->11),(13->19),(23->26),(25->28)-pentakis(sulfide) 
Molecular Formula:C₁₄₃H₂₃₀N₄₂O₃₇S₇
Molecular Weight:3354.08
CAS Registry Number:1414-45-5
EINECS:215-807-5

Nisin is a polycyclic peptide antibacterial with 34 amino acid residues used as a food preservative. It contains the uncommon amino acids lanthionine (Lan), methyllanthionine (MeLan), didehydroalanine (Dha) and didehydroaminobutyric acid (Dhb). These unusual amino acids are introduced by posttranslational modification of the precursor peptide. In these reactions a ribosomally synthesized 57-mer is converted to the final peptide. The unsaturated amino acids originate from serine and threonine, and the enzyme-catalysed addition of cysteine residues to the didehydro amino acids result in the multiple thioether bridges.

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