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Examples of methyltransferase enzymes relevant to disease: thiopurine methyltransferase: defects in this gene causes toxic accumulation of thiopurine compounds, drugs used in chemotherapy and immunosuppressant therapy
m4C methyltransferases (N-4 cytosine-specific DNA methylases) are enzymes that specifically methylate the amino group at the C-4 position of cytosines in DNA. [5] Such enzymes are found as components of type II restriction-modification systems in prokaryotes. Such enzymes recognise a specific sequence in DNA and methylate a cytosine in that ...
Reference ranges (reference intervals) for blood tests are sets of values used by a health professional to interpret a set of medical test results from blood samples. Reference ranges for blood tests are studied within the field of clinical chemistry (also known as "clinical biochemistry", "chemical pathology" or "pure blood chemistry"), the ...
The resulting enzyme is thermolabile and in homozygotes, enzymatic activity is depressed to 35% of its usual level. [10] The second variant is a milder one, caused by a homologous 1298C polymorphism. This leads to 68% of the control values of enzyme activity, [ 10 ] and it normally does not lead to low serum folate.
In enzymology, a homocysteine S-methyltransferase (EC 2.1.1.10) is an enzyme that catalyzes the chemical reaction. S-methylmethionine + L-homocysteine 2 L-methionine. Thus, the two substrates of this enzyme are S-methylmethionine and L-homocysteine, and it produces 2 molecules of L-methionine.
DNA (cytosine-5)-methyltransferase 1 (Dnmt1) is an enzyme that catalyzes the transfer of methyl groups to specific CpG sites in DNA, a process called DNA methylation. In humans, it is encoded by the DNMT1 gene. [5] Dnmt1 forms part of the family of DNA methyltransferase enzymes, which consists primarily of DNMT1, DNMT3A, and DNMT3B.
Methylated-DNA--protein-cysteine methyltransferase (MGMT), also known as O 6-alkylguanine DNA alkyltransferase AGT, is a protein that in humans is encoded by the MGMT gene. [ 5 ] [ 6 ] MGMT is crucial for genome stability.
DNA (cytosine-5)-methyltransferase 3A (DNMT3A) is an enzyme that catalyzes the transfer of methyl groups to specific CpG structures in DNA, a process called DNA methylation. The enzyme is encoded in humans by the DNMT3A gene. [5] [6] This enzyme is responsible for de novo DNA methylation. Such function is to be distinguished from maintenance ...