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Deamination is the removal of an amino group from a molecule. [1] Enzymes that catalyse this reaction are called deaminases. In the human body, deamination takes place primarily in the liver; however, it can also occur in the kidney. In situations of excess protein intake, deamination is used to break down amino acids for energy.
Cytosine can also be methylated into 5-methylcytosine by an enzyme called DNA methyltransferase or be methylated and hydroxylated to make 5-hydroxymethylcytosine. The difference in rates of deamination of cytosine and 5-methylcytosine (to uracil and thymine ) forms the basis of bisulfite sequencing .
In enzymology, a cytosine deaminase (EC 3.5.4.1) is an enzyme that catalyzes the chemical reaction cytosine + H 2 O ⇌ {\displaystyle \rightleftharpoons } uracil + NH 3 Thus, the two substrates of this enzyme are cytosine [ 1 ] and H 2 O , whereas its two products are uracil and NH 3 .
More specifically, the catalytic domain is a zinc dependent cytidine deaminase domain and is essential for cytidine deamination. The positively charged zinc ion in the catalytic domain attracts to the partial-negative charge of RNA. In the case of APOBEC-1, the mRNA transcript of intestinal apolipoprotein B is altered.
Activation-induced cytidine deaminase, also known as AICDA, AID and single-stranded DNA cytosine deaminase, is a 24 kDa enzyme which in humans is encoded by the AICDA gene. [5] It creates mutations in DNA [6] [7] by deamination of cytosine base, which turns it into uracil (which is recognized as a thymine). In other words, it changes a C:G base ...
This underrepresentation is a consequence of the high mutation rate of methylated CpG sites: the spontaneously occurring deamination of a methylated cytosine results in a thymine, and the resulting G:T mismatched bases are often improperly resolved to A:T; whereas the deamination of unmethylated cytosine results in a uracil, which as a foreign ...
72269 Ensembl ENSG00000158825 ENSMUSG00000028755 UniProt P32320 P56389 RefSeq (mRNA) NM_001785 NM_028176 RefSeq (protein) NP_001776 NP_082452 Location (UCSC) Chr 1: 20.59 – 20.62 Mb Chr 4: 138.07 – 138.1 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Cytidine deaminase is an enzyme that in humans is encoded by the CDA gene. This gene encodes an enzyme involved in pyrimidine ...
During experimentation, substituted leucine and isoleucine residues significantly reduced the deamination of cytosine. ACF binds to the mooring sequence, which puts A1 in position to edit the correct residue. [10] By converting cytosine to uracil, A1 changes the codon from CAA, which codes for glutamine during transcription, to UAA, a stop ...