Type II DNA topoisomerases are ubiquitous enzymes that catalyse the ATP-dependent transport of one DNA duplex through a second DNA segment via a transient double-strand break. Type II DNA topoisomerases are now subdivided into two sub-families, type ...
Type II DNA topoisomerases are ubiquitous enzymes that catalyse the ATP-dependent transport of one DNA duplex through a second DNA segment via a transient double-strand break. Type II DNA topoisomerases are now subdivided into two sub-families, type IIA and IIB DNA topoisomerases. TP6A_N is present in type IIB topoisomerase and is thought to be involved in DNA binding owing to its sequence similarity to E. coli catabolite activator protein (CAP) [1].
All-beta domain in DNA topoisomerase VI alpha subunit
In all organisms, type II DNA topoisomerases are essential for untangling chromosomal DNA. The archaeal type II protein is termed DNA topoisomerase VI. This entry represents an all beta domain found in these proteins.
This topoisomerase-primase (Toprim) nucleotidyl transferase/hydrolase domain is found in the type II topoisomerase VIA and Spo11, which structurally related. Spo11 is a meiosis-specific protein that is responsible for the initiation of recombination ...
This topoisomerase-primase (Toprim) nucleotidyl transferase/hydrolase domain is found in the type II topoisomerase VIA and Spo11, which structurally related. Spo11 is a meiosis-specific protein that is responsible for the initiation of recombination through the formation of DNA double-strand breaks by a type II DNA topoisomerase-like activity. Topoisomerase VI is a type IIB enzyme that breaks double-stranded DNA and assembles as a heterotetramer, consisting of two A subunits required for DNA cleavage and two B subunits required for ATP hydrolysis [1-3].
Type 2 DNA topoisomerase 6 subunit B C-terminal domain
This is the C-terminal domain found in archaeal type 2 DNA topoisomerase 6 subunit B (EC:5.99.1.3). This region is a small helix-two turns-helix (H2TH) domain inserted between the GHKL and transducer domains which adopts an immunoglobulin-like fold. ...
This is the C-terminal domain found in archaeal type 2 DNA topoisomerase 6 subunit B (EC:5.99.1.3). This region is a small helix-two turns-helix (H2TH) domain inserted between the GHKL and transducer domains which adopts an immunoglobulin-like fold. Mutation analysis of this C-terminal domain showed that the overall activity of the mutant mesophilic methanogen M. mazei Top6B (MmT6) is modestly reduced but its relative activity on different substrates is not affected. Due to the similarity of the B subunit's CTD to known protein- and carbohydrate-binding modules, it has been suggested that it could regulate topo VI spatially, perhaps by localizing the enzyme to a specific subcellular region or functional partner [1].
Members of this family adopt a structure consisting of a four-stranded beta-sheet backed by three alpha-helices, the last of which is over 50 amino acids long and extends from the body of the protein by several turns. This domain has been proposed to ...
Members of this family adopt a structure consisting of a four-stranded beta-sheet backed by three alpha-helices, the last of which is over 50 amino acids long and extends from the body of the protein by several turns. This domain has been proposed to mediate intersubunit communication by structurally transducing signals from the ATP binding and hydrolysis domains to the DNA binding and cleavage domains of the gyrase holoenzyme [1].