DNA gyrase subunit B - P0AES6 (GYRB_ECOLI)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

DNA gyrase negatively supercoils closed circular double-stranded DNA in an ATP-dependent manner to maintain chromosomes in an underwound state (PubMed:186775, PubMed:3031051, PubMed:1323022, PubMed:8248233, PubMed:7811004, PubMed:8621650, PubMed:9657678, PubMed:12051842, PubMed:12051843, PubMed:18642932, PubMed:19060136, PubMed:19965760, PubMed:22457353, PubMed:23294697, PubMed:20356737, PubMed:20675723, PubMed:23352267, PubMed:24386374, PubMed:25202966, PubMed:25849408). This makes better substrates for topoisomerase 4 (ParC and ParE) which is the main enzyme that unlinks newly replicated chromosomes in E.coli (PubMed:9334322). Gyrase catalyzes the interconversion of other topological isomers of double-stranded DNA rings, including catenanes (PubMed:22457352). Relaxes negatively supercoiled DNA in an ATP-independent manner (PubMed:337300). E.coli gyrase has higher supercoiling activity than other characterized bacterial gyrases; at comparable concentrations E.coli gyrase introduces more supercoils faster than M.tuberculosis gyrase, while M.tuberculosis gyrase has higher decatenation than supercoiling activity compared to E.coli (PubMed:22457352). E.coli makes 15% more negative supercoils in pBR322 plasmid DNA than S.typhimurium; the S.typhimurium GyrB subunit is toxic in E.coli, while the E.coli copy can be expressed in S.typhimurium even though the 2 subunits have 777/804 residues identical (PubMed:17400739). The enzymatic differences between E.coli gyrase and topoisomerase IV are largely due to the GyrA C-terminal domain (approximately residues 524-841) and specifically the GyrA-box (PubMed:8962066, PubMed:16332690). UniProt
Catalytic Activity
ATP-dependent breakage, passage and rejoining of double-stranded DNA. UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Heterotetramer, composed of two GyrA and two GyrB chains (PubMed:9148951, PubMed:12051842). In the heterotetramer, GyrA contains the active site tyrosine that forms a transient covalent intermediate with the DNA, while GyrB binds cofactors and catalyzes ATP hydrolysis (PubMed:12051843, PubMed:18642932, PubMed:20675723, PubMed:19965760). UniProt
Consists of 3 domains; the ATPase domain (residues 1-220), the transducer domain (221-392) and the toprim domain (393-804) (PubMed:1646964, PubMed:10734094). ATP-binding is cooperative, and both subunits must be wild-type at residue 103 for supercoiling to occur (PubMed:8621650). Non-hydrolyzable ATP analogs (and ATP-binding) induce dimerization and enhance ATPase activity (PubMed:10734094, PubMed:9657678). ATP hydrolysis induces domain shifts that are probably part of the mechanism of DNA cleavage and rejoining (PubMed:25202966). UniProt
The Protein Feature View requires a browser that supports SVG (Scalable Vector Graphics). Mouse over tracks and labels for more information.
Data origin/color codes
The vertical color bar on the left side indicates data provenance.
Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
Sequence Mismatches It is now possible to see information about expression tags, cloning artifacts, and many other details related to sequence mismatches.
Icons represent a number of different sequence modifications that can be observed in PDB files. For example the 'T' icon T represents expression tags that have been added to the sequence. The 'E' icon E represents an engineered mutation. However, besides these two, there are many other icons. For more information about the meaning and exact position of a sequence modification, move the cursor over the icon.
Validation Track

For more details on the Validation Track (Structure Summary Page only) see the dedicated help page.

Data in red indicates combined ranges of Homology Models from the SWISS-MODEL Repository  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
Organism icons generated by flaticon.com under CC BY. The authors are: Freepik, Icons8, OCHA, Scott de Jonge.

For more details on the Protein Feature view see the dedicated help page.