S-Adenosyl methionine (SAM), also known under the commercial names of SAMe, SAM-e, or AdoMet, is a common cosubstrate involved in methyl group transfers, transsulfuration, and aminopropylation. Although these anabolic reactions occur throughout the body, most SAM is produced and consumed in the liver. More than 40 methyl transfers from SAM are known, to various substrates such as nucleic acids, proteins, lipids and secondary metabolites. It is made from adenosine triphosphate (ATP) and methionine by methionine adenosyltransferase. SAM was first discovered by Giulio Cantoni in 1952.
S-Adenosyl-L-homocysteine (SAH) is the biosynthetic precursor to homocysteine. SAH is formed by the demethylation of S-adenosyl-L-methionine. Adenosylhomocysteinase converts SAH into homocysteine and adenosine.
Hypermethioninemia is an excess of the amino acid methionine, in the blood. This condition can occur when methionine is not broken down properly in the body.
In enzymology, a carnosine N-methyltransferase is an enzyme that catalyzes the chemical reaction
Guanidinoacetate N-methyltransferase is an enzyme that catalyzes the chemical reaction and is encoded by gene GAMT located on chromosome 19p13.3.
In enzymology, a magnesium protoporphyrin IX methyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, a mRNA (guanine-N7-)-methyltransferase also known as mRNA cap guanine-N7 methyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, a mRNA (nucleoside-2'-O-)-methyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, a phosphatidyl-N-methylethanolamine N-methyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, a precorrin-4 C11-methyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, a protein-glutamate O-methyltransferase is an enzyme that catalyzes the chemical reaction
The isoprenylcysteine o-methyltransferase carries out carboxyl methylation of cleaved eukaryotic proteins that terminate in a CaaX motif. In Saccharomyces cerevisiae this methylation is carried out by Ste14p, an integral endoplasmic reticulum membrane protein. Ste14p is the founding member of the isoprenylcysteine carboxyl methyltransferase (ICMT) family, whose members share significant sequence homology.
In enzymology, a tRNA guanosine-2'-O-methyltransferase is an enzyme that catalyzes the chemical reaction
Nucleoside diphosphate kinase A is an enzyme that in humans is encoded by the NME1 gene. It is thought to be a metastasis suppressor.
In enzymology, an adenosylhomocysteine nucleosidase (EC 3.2.2.9) is an enzyme that catalyzes the chemical reaction
In enzymology, a S-adenosylhomocysteine deaminase (EC 3.5.4.28) is an enzyme that catalyzes the chemical reaction
Dihydropyrimidinase-related protein 3 is an enzyme that in humans is encoded by the DPYSL3 gene. A recent bioinformatics study suggested that the DPYSL3 gene might have a prognostic role in neuroblastoma.
Myosin-Ie (Myo1e) is a protein that in humans is encoded by the MYO1E gene.
S-adenosyl-L-homocysteine hydrolase (AdoHcyase) is an enzyme of the activated methyl cycle, responsible for the reversible hydration of S-adenosyl-L-homocysteine into adenosine and homocysteine.
Diadenosine hexaphosphate hydrolase (AMP-forming) (EC 3.6.1.60, hAps1, NUDT11 (gene), hAps2, NUDT10 (gene)) is an enzyme with systematic name P1,P6-bis(5'-adenosyl)hexaphosphate nucleotidohydrolase (AMP-forming). This enzyme catalyses the following chemical reaction
