Function and Biology

ADENINE-N6-DNA-METHYLTRANSFERASE TAQI

Source organism: Thermus aquaticus
Biochemical function: transferase activity
Biological process: DNA modification
Cellular component: not assigned

EC 2.1.1.72: Site-specific DNA-methyltransferase (adenine-specific)

Reaction catalysed:
S-adenosyl-L-methionine + adenine in DNA = S-adenosyl-L-homocysteine + N-6-methyladenine in DNA.
Comments:
  • This is a large group of enzymes, most of which form so-called 'restriction-modification systems', with nucleases that possess similar site specificity (the nucleases are listed as either EC 3.1.21.3, EC 3.1.21.4 and EC 3.1.21.5).
  • See the REBASE database for a complete list of these enzymes: http://rebase.neb.com/rebase/
Systematic name:
S-adenosyl-L-methionine:adenine in DNA N(6)-methyltransferase
Alternative Name(s):
  • Modification methylase
  • Restriction-modification system
  • N-6 adenine-specific DNA methylase

Sequence families

CATH Protein families (Pfam)
PF12950
Domain description: TaqI-like C-terminal specificity domain
Occurring in:
  1. Modification methylase TaqI
1 copy of Pfam domain PF12950 (TaqI-like C-terminal specificity domain) in Modification methylase TaqI in PDB 2adm.

PF07669
Domain description: Eco57I restriction-modification methylase
Occurring in:
  1. Modification methylase TaqI
1 copy of Pfam domain PF07669 (Eco57I restriction-modification methylase) in Modification methylase TaqI in PDB 2adm.

CATH InterPro annotations
IPR002052
Domain description: DNA methylase, N-6 adenine-specific, conserved site
Occurring in:
  1. Modification methylase TaqI
IPR029063
Domain description: S-adenosyl-L-methionine-dependent methyltransferase
Occurring in:
  1. Modification methylase TaqI
IPR025931
Domain description: TaqI-like C-terminal specificity domain
Occurring in:
  1. Modification methylase TaqI
IPR011639
Domain description: Restriction modification methylase Eco57I
Occurring in:
  1. Modification methylase TaqI
IPR021188
Domain description: N6 adenine-specific DNA methyltransferase, TaqI class
Occurring in:
  1. Modification methylase TaqI

Structure domains

CATH CATH domains
3.40.50.150
Class: Alpha Beta
Architecture: 3-Layer(aba) Sandwich
Topology: Rossmann fold
Homology: Vaccinia Virus protein VP39
Occurring in:
  1. Modification methylase TaqI
1 copy of CATH domain 3.40.50.150 (Rossmann fold) in Modification methylase TaqI in PDB 2adm.
3.90.220.10
Class: Alpha Beta
Architecture: Alpha-Beta Complex
Topology: Adenine-n6-DNA-methyltransferase TaqI; Chain A, domain 2
Homology: Adenine-n6-DNA-methyltransferase Taqi, Chain A, domain 2
Occurring in:
  1. Modification methylase TaqI
1 copy of CATH domain 3.90.220.10 (Adenine-n6-DNA-methyltransferase TaqI; Chain A, domain 2) in Modification methylase TaqI in PDB 2adm.
SCOP SCOP annotations
116735
Class: Alpha and beta proteins (a+b)
Fold: DNA methylase specificity domain
Superfamily: DNA methylase specificity domain
Occurring in:
  1. Modification methylase TaqI
1 copy of SCOP domain 116735 (TaqI C-terminal domain-like) in Modification methylase TaqI in PDB 2adm.
88787
Class: Alpha and beta proteins (a/b)
Fold: S-adenosyl-L-methionine-dependent methyltransferases
Superfamily: S-adenosyl-L-methionine-dependent methyltransferases
Occurring in:
  1. Modification methylase TaqI
1 copy of SCOP domain 88787 (DNA methylase TaqI, N-terminal domain) in Modification methylase TaqI in PDB 2adm.