Part:BBa_K3034000

CrpP：Ciprofloxacin-Modifying Enzyme

CrpP is a novel ciprofloxacin-modifying enzyme which can phosphorylate ciprofloxacin(CIP). Then the phosphorylated CIP goes through multiple steps of degradation spontaneously and produces 1,4-dihydroquinoline finally[1]. 1,4-dihydroquinoline is used as a kind of new carriers for specific brain delivery [2], so we can infer that it's nontoxic. This part is responsible for degradation of ciprofloxacin in our project.

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]

Characterization

Molecular weight

This gene codes for a protein of 65 amino acids with a molecular mass about 15 kDa.

Expression of CrpP-Histag

Expression of CrpP-Histag is unsatisfying in E.coli DH5α, so we clone pelB-5D, CrpP and 6×Histag CDS into an expression vector, then the vector is transformed into E.coli BL21(DE3). We use IPTG to induce its overexpression and SDS-PAGE is used to detect target protein's expression.

Fig. 1SDS-PAGE of CrpP-Histag. Lane 1: Protein ladder; Lane 2、3、5 and 6: experimental group(0.5mM IPTG is added); Lane 3、4、7 and 8: control group(without 0.5mM IPTG)

References

[1]Chávez-Jacobo, Víctor M., et al. "CrpP is a novel ciprofloxacin-modifying enzyme encoded by the Pseudomonas aeruginosa pUM505 plasmid." Antimicrobial agents and chemotherapy 62.6 (2018): e02629-17. [2]Foucout, Léna?g, et al. "Synthesis, radiosynthesis and biological evaluation of 1, 4-dihydroquinoline derivatives as new carriers for specific brain delivery." Organic & biomolecular chemistry 7.18 (2009): 3666-3673.