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'''dipeptide''' is a sometimes ambiguous designation of two classes of organic compounds: Its molecules contain either two amino acids+ joined by a single peptide bond+ or one amino acid with two peptide bonds.

In this usage, ''X dipeptide'' (with ''X'' designating an amino acid) must be understood as ''di-X peptide''. This nomenclature is continued by tripeptide+ (three amino acids, two peptide bonds), tetrapeptide+, and so on; longer chains are called oligopeptide+, polypeptide+, protein+.

Dipeptides are produced from polypeptide+s by the action of the hydrolase+ enzyme+ dipeptidyl peptidase+. Dietary proteins are digested to dipeptides and amino acids, and the dipeptides are absorbed more rapidly than the amino acids, because their uptake involves a separate mechanism. Dipeptides activate G-cells+ found in the stomach to secrete gastrin+.

The Bergmann azlactone peptide synthesis+ is a classic organic synthesis+ for the preparation of dipeptides.

all types of Dipeptide list
*Carnosine+ (''beta''-alanyl-L-histidine) is highly concentrated in muscle+ and brain tissues+.
*Anserine+ (''beta''-alanyl-''N''-methyl histidine) is found in the skeletal muscle+ and brain of mammal+s.
*Homoanserine+ (''N''-(4-aminobutyryl)-L-histidine) is another dipeptide identified in the brain and muscles of mammals.
*Kyotorphin+ (L-tyrosyl-L-arginine) is a neuroactive dipeptide+ which plays a role in pain regulation in the brain.
* (or ophidine) (''beta''-alanyl-''N'' ''tau''-methyl histidine) has been identified in the muscles of several species of mammal (including man), and the chicken+.
*Aspartame+ (''N''-L-α-aspartyl-L-phenylalanine 1-methyl ester) is an artificial sweetener+.
*Glorin+ (''N''-propionyl-γ-L-glutamyl-L-ornithine-δ-lac ethyl ester) is a chemotactic dipeptide+ for the slime-mould+ ''Polysphondylium violaceum''.
*Barettin+ (cyclo-[(6-bromo-8-en-tryptophan)-arginine]) is a cyclic dipeptide+ from the marine sponge+ ''Geodia barretti''.

In this usage, ''X dipeptide'' is taken literally: One amino acid ''X'' is equipped with two minimal peptide bonds: The C terminus COOH becomes COCH3, the N terminus NH2 becomes NHCH3.
For instance, alanine dipeptide is CH3CONHCH(CH3)CONHCH3.


* at PeptideGuide.

Dipeptide+ A dipeptide is a sometimes ambiguous designation of two classes of organic compounds: Its molecules contain either two amino acids joined by a single peptide bond or one amino acid with two peptide bonds.
 Dipeptidyl-peptidase I+ Dipeptidyl peptidase I (EC, cathepsin C, dipeptidyl aminopeptidase I, dipeptidyl transferase, dipeptide arylamidase I, DAP I) is an enzyme.
 Dipeptide hydrolase+ Dipeptide hydrolase may refer to:
Dipeptidyl peptidase-4+ Dipeptidyl peptidase-4 (DPP4), also known as adenosine deaminase complexing protein 2 or CD26 (cluster of differentiation 26) is a protein that, in humans, is encoded by the DPP4 gene.
Dipeptidyl peptidase-4 inhibitor+ Inhibitors of dipeptidyl peptidase 4, also DPP-4 inhibitors or gliptins, are a class of oral hypoglycemics that block DPP-4 (DPP-IV).
 Dipeptidyl-peptidase III+ Dipeptidyl-peptidase III (EC, dipeptidyl aminopeptidase III, dipeptidyl arylamidase III, enkephalinase B, red cell angiotensinase) is an enzyme.
Dipeptidase 1+ Dipeptidase 1 is an enzyme that in humans is encoded by the DPEP1 gene.
 Dipeptidase E+ Dipeptidase E (EC, aspartyl dipeptidase, peptidase E, PepE gene product (Salmonella typhimurium)) is an enzyme.
 Dipeptidase 3+ Dipeptidase 3 (DPEP3) is a protein that in humans is encoded by the DPEP3 gene.
 Dipeptidyl-peptidase II+ Dipeptidyl-peptidase II (EC, dipeptidyl aminopeptidase II, dipeptidyl arylamidase II, carboxytripeptidase, dipeptidyl peptidase II, DAP II, dipeptidyl(amino)peptidase II, dipeptidylarylamidase) is an enzyme.