Plasma kallikrein (KLKB1), partial, human, recombinant

Organism: Homo sapiens (Human). Source: Yeast. Expression Region: 20-390aa. Protein Length: Partial. Tag Info: N-terminal 6xHis-tagged. Target Protein Sequence: GCLTQLYENA FFRGGDVASM YTPNAQYCQM RCTFHPRCLL FSFLPASSIN DMEKRFGCFL KDSVTGTLPK VHRTGAVSGH SLKQCGHQIS ACHRDIYKGV DMRGVNFNVS KVSSVEECQK RCTNNIRCQF FSYATQTFHK AEYRNNCLLK YSPGGTPTAI KVLSNVESGF SLKPCALSEI GCHMNIFQHL AFSDVDVARV LTPDAFVCRT ICTYHPNCLF FTFYTNVWKI ESQRNVCLLK TSESGTPSSS TPQENTISGY SLLTCKRTLP EPCHSKIYPG VDFGGEELNV TFVKGVNVCQ ETCTKMIRCQ FFTYSLLPED CKEEKCKCFL RLSMDGSPTR IAYGTQGSSG YSLRLCNTGD NSVCTTKTST R. 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: The enzyme cleaves Lys-Arg and Arg-Ser bonds. It activates, in a reciprocal reaction, factor XII after its binding to a negatively charged surface. It also releases bradykinin from HMW kininogen and may also play a role in the renin-angiotensin system by converting prorenin into renin. Reference: "Human plasma prekallikrein, a zymogen to a serine protease that contains four tandem repeats." Chung D.W., Fujikawa K., McMullen B.A., Davie E.W. Biochemistry 25:2410-2417(1986). Function: The enzyme cleaves Lys-Arg and Arg-Ser bonds. It activates, in a reciprocal reaction, factor XII after its binding to a negatively charged surface. It also releases bradykinin from HMW kininogen and may also play a role in the renin-angiotensin system by converting prorenin into renin.