Q44278 · GYRB_ACIS7
- ProteinDNA gyrase subunit B
- GenegyrB
- StatusUniProtKB reviewed (Swiss-Prot)
- Amino acids216 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
function
A type II topoisomerase that negatively supercoils closed circular double-stranded (ds) DNA in an ATP-dependent manner to modulate DNA topology and maintain chromosomes in an underwound state. Negative supercoiling favors strand separation, and DNA replication, transcription, recombination and repair, all of which involve strand separation. Also able to catalyze the interconversion of other topological isomers of dsDNA rings, including catenanes and knotted rings. Type II topoisomerases break and join 2 DNA strands simultaneously in an ATP-dependent manner.
Miscellaneous
Few gyrases are as efficient as E.coli at forming negative supercoils. Not all organisms have 2 type II topoisomerases; in organisms with a single type II topoisomerase this enzyme also has to decatenate newly replicated chromosomes.
Catalytic activity
Features
Showing features for site.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Site | 171 | Interaction with DNA | ||||
Sequence: K | ||||||
Site | 174 | Interaction with DNA | ||||
Sequence: N |
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | cytoplasm | |
Molecular Function | ATP binding | |
Molecular Function | DNA binding | |
Molecular Function | DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) activity | |
Biological Process | DNA topological change |
Keywords
- Molecular function
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameDNA gyrase subunit B
- EC number
Gene names
Organism names
- Taxonomic lineageBacteria > Pseudomonadota > Gammaproteobacteria > Moraxellales > Moraxellaceae > Acinetobacter
Accessions
- Primary accessionQ44278
- Secondary accessions
Subcellular Location
PTM/Processing
Features
Showing features for chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Chain | PRO_0000145286 | 1-216 | DNA gyrase subunit B | |||
Sequence: SHKVSGGLHGVGVSVVNALSSKLQLTIHRAGQIHEQEYQHGDPQYPLKVVGETSTTGTTVRFWPSGDTFSQTIFNVDILARRLRELSFLNAGVKIVLRDERVNFEHIYAYEGGLSEKSALDIAGLPGKLADCQEKDPALSELYLVEGDSPGGSAKQGRNRKMQAILPLKGKILNVERARFDKMISSQEVGTLITALGCGIGREEYNPDKLRYHKII |
Interaction
Subunit
Heterotetramer, composed of two GyrA and two GyrB chains. In the heterotetramer, GyrA contains the active site tyrosine that forms a transient covalent intermediate with DNA, while GyrB binds cofactors and catalyzes ATP hydrolysis.
Structure
Family & Domains
Features
Showing features for domain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Domain | 140-216 | Toprim | ||||
Sequence: SELYLVEGDSPGGSAKQGRNRKMQAILPLKGKILNVERARFDKMISSQEVGTLITALGCGIGREEYNPDKLRYHKII |
Sequence similarities
Belongs to the type II topoisomerase GyrB family.
Family and domain databases
Sequence
- Sequence statusFragments
- Length216
- Mass (Da)23,742
- Last updated1997-11-01 v1
- Checksum48186007AD1D301B
Features
Showing features for non-terminal residue, non-adjacent residues.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Non-terminal residue | 1 | |||||
Sequence: S | ||||||
Non-adjacent residues | 116-117 | |||||
Sequence: EK | ||||||
Non-terminal residue | 216 | |||||
Sequence: I |