Virulence sensor histidine kinase PhoQ (phoQ), partial, Salmonella typhimurium, recombinant

Organism: Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720). Source: E.coli. Expression Region: 215-487aa. Protein Length: partial. Tag Info: N-terminal 10xhis-tagged and C-terminal myc-tagged. Target Protein Sequence: WWSLRPIEAL AREVRELEDH HREMLNPETT RELTSLVRNL NQLLKSERER YNKYRTTLTD LTHSLKTPLA VLQSTLRSLR NEKMSVSKAE PVMLEQISRI SQQIGYYLHR ASMRGSGVLL SRELHPVAPL LDNLISALNK VYQRKGVNIS MDISPEISFV GEQNDFVEVM GNVLDNACKY CLEFVEISAR QTDDHLHIFV EDDGPGIPHS KRSLVFDRGQ RADTLRPGQG VGLAVAREIT EQYAGQIIAS DSLLGGARME VVFGRQHPTQ KEE. Purity: Greater than 90% as determined by SDS-PAGE. Endotoxin: Not test. Biological Activity: n/a. Form: Liquid or Lyophilized powder. Buffer: If the delivery form is liquid, the default storage buffer is Tris/PBS-based buffer, 5%-50% glycerol. If the delivery form is lyophilized powder, the buffer before lyophilization is Tris/PBS-based buffer, 6% Trehalose, pH 8.0. Reconstitution: We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Please reconstitute protein in deionized sterile water to a concentration of 0.1-1.0 mg/mL.We recommend to add 5-50% of glycerol (final concentration) and aliquot for long-term storage at -20 °C/-80 °C. Our default final concentration of glycerol is 50%. Customers could use it as reference. Storage: The shelf life is related to many factors, storage state, buffer ingredients, storage temperature and the stability of the protein itself. Generally, the shelf life of liquid form is 6 months at -20 °C/-80 °C. The shelf life of lyophilized form is 12 months at -20 °C/-80 °C. Notes: Repeated freezing and thawing is not recommended. Store working aliquots at 4 °C for up to one week. Relevance: Member of the two-component regulatory system PhoP/PhoQ which regulates the expression of genes involved in virulence, adaptation to acidic and low Mg(2+) environments and resistance to host defense antimicrobial peptides. Essential for intramacrophage survival of S.typhimurium. In low periplasmic Mg(2+), PhoQ functions as a membrane-associated protein kinase that undergoes autophosphorylation and subsequently transfers the phosphate to PhoP, resulting in the expression of PhoP-activated genes (PAG) and repression of PhoP-repressed genes (PRG). In high periplasmic Mg(2+), acts as a protein phosphatase that dephosphorylates phospho-PhoP, resulting in the repression of PAG and may lead to expression of some PRG. Essential for transcription of spiC inside macrophages by controlling the expression of the two-component regulatory system SsrB/SpiR (SsrA) and Pir at transcriptional and post-transcriptional levels respectively. Promotes expression of the two-component regulatory system PmrA/PmrB via activation of pmrD gene. Is required to attenuate bacterial growth within fibroblast cells and to enhance bacterial resistance to bile in intestinal cells. Negatively regulates prgH, which is required for invasion of epithelial cells. Involved in acid tolerance. Reference: "Functional reconstitution of the Salmonella typhimurium PhoQ histidine kinase sensor in proteoliposomes." Sanowar S., Le Moual H. Biochem. J. 390:769-776(2005). Function: nan