Hfq

• Description: RNA chaperone
  
  

Gene name	hfq
Synonyms	ymaH
Essential	no
Product	RNA chaperone
Function	unknown
Gene expression levels in SubtiExpress: hfq
MW, pI	8 kDa, 8.698
Gene length, protein length	219 bp, 73 aa
Immediate neighbours	miaA, ymzC
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList
Expression at a glance   PubMed

Categories containing this gene/protein

RNA chaperones

The gene

Basic information

• Locus tag: BSU17340

Database entries

• DBTBS entry: no entry

• SubtiList entry: [1]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity:

• Protein family: hfq family (according to Swiss-Prot)

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity:

• Interactions:

• Localization:

Database entries

• Structure: 3HSB (complex with an RNA aptamer) PubMed

• UniProt: O31796

• KEGG entry: [2]

• E.C. number:

Expression and regulation

• Operon: hfq PubMed

• Expression browser: hfq PubMed

• Sigma factor:

• Regulation:
  • repressed by glucose (7.7-fold) PubMed
  • expression (mRNA levels) is quite constant during growth in minimal medium PubMed
  • the Hfq protein amount increases upon transition to stationary phase PubMed

• Regulatory mechanism:

• Additional information:

Biological materials

• Mutant: GP22 (cat), available in the Jörg Stülke's lab

• Expression vector:

• lacZ fusion: pGP460 (in pAC7), available in Jörg Stülke's lab

• GFP fusion:

• two-hybrid system: B. pertussis adenylate cyclase-based bacterial two hybrid system (BACTH), available in Jörg Stülke's lab

• FLAG-tag construct:
  • GP1067 (spc, based on pGP1331), available in Jörg Stülke's lab

• Antibody:

References

Reviews

Jörg Vogel, Ben F Luisi
Hfq and its constellation of RNA.
Nat Rev Microbiol: 2011, 9(8);578-89
[PubMed:21760622] [WorldCat.org] [DOI] (I e)

Richard G Brennan, Todd M Link
Hfq structure, function and ligand binding.
Curr Opin Microbiol: 2007, 10(2);125-33
[PubMed:17395525] [WorldCat.org] [DOI] (P p)

Poul Valentin-Hansen, Maiken Eriksen, Christina Udesen
The bacterial Sm-like protein Hfq: a key player in RNA transactions.
Mol Microbiol: 2004, 51(6);1525-33
[PubMed:15009882] [WorldCat.org] [DOI] (P p)