Serine/threonine-protein kinase HipA - P23874 (HIPA_ECOLI)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P23874: 11
Toxic component of a toxin-antitoxin (TA) module. Phosphorylates Glu-tRNA-ligase (GltX, on 'Ser-239') in vivo. Phosphorylation of GltX prevents it from being charged, leading to an increase in uncharged tRNA(Glu). This induces amino acid starvation and the stringent response via RelA/SpoT and increased ppGpp levels, which inhibits replication, transcription, translation and cell wall synthesis, reducing growth and leading to multidrug resistance and persistence. The hipA7 mutation (a double G22S D291A mutation) leads to increased generation of persister cells, cells that survive antibiotic treatment probably by entering into a dormant state. Wild-type cells produce persisters at a frequency of 10(-6) to 10(-5) whereas mutant hipA7 cells produce persisters at a frequency of 10(-2). Generation of persister cells requires ppGpp as cells lacking relA or relA/spoT generate fewer or no persister cells respectively compared to hipA7. Low level expression of HipA induces dormancy and depending on the protein level, can be toxic enough to reduce cell growth or even kill cells. Low levels of wild-type HipA lead to high beta-lactam antibiotic tolerance of the survivor cells, also dependent on relA and relA/spoT. The toxic effect of HipA is neutralized by its cognate antitoxin HipB. With HipB acts as a corepressor for transcription of the hipBA promoter; binding to DNA induces a 70 degree bend. (data source: UniProt  )
Catalytic Activity

ATP + a protein = ADP + a phosphoprotein.

(data source: UniProt  )
Subunit structure
Forms a HipA(2)HipB(2) heterotetramer which can interact with DNA. (data source: UniProt  )
Other Gene names: hipA b1507 JW1500
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Data in green originates from UniProtKB  
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.
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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.
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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).
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