A DNA sequence encoding the human CPA1 precursor (NP_001859.1) (Met 1-Tyr 419) was expressed with a C-terminal polyhistidine tag.
Alternative Names
Carboxypeptidase A1; CPA1; CPA
Reconstitution
Please refer to the printed manual for detailed information.
Background
Carboxypeptidase A1 ?CPA1?is secreted as a pancreatic procarboxypeptidase, and cleaves the C-terminal amide or ester bond of peptides that have a free C-terminal carboxyl group, with the preference of residues with aromatic or branched aliphatic side chains. CPA1 comprises a signal peptide, a pro region and a mature chain, and can be activated after cleavage of the pro peptide. In contrast to procarboxypeptidase B which was always secreted by the pancreas as a monomer, procarboxypeptidase A occurs as a monomer and/or associated to one or two functionally different proteins, such as zymogen E, and is involved in zymogen inhibition. Three different forms of human pancreatic procarboxypeptidase A have been isolated.
Reactivity
Human
Tag
C-His
Formulation
Lyophilized from sterile PBS, pH 7.4
Host
HEK293 Cells
Accession Number
NP_001859.1
Endotoxin Level
< 1.0 EU per ug as determined by the LAL method.
Bioactivity
Measured by its ability to cleave the colorimetric peptide substrate Ac-Phe-Thiaphe-OH in the presence of 5,5'Dithiobis (2-nitrobenzoic acid) (DTNB). The specific activity is >3,500 pmoles/min/ug.
Mol Weight
47 kDa
Mw(kda)
47 kDa
Sequence Info
Met 1-Tyr 419
Shipping
This product is provided as lyophilized powder which is shipped with ice packs.
Stotage Note
Lyophilized proteins are stable for up to 12 months when stored at -20 to -80°C. Reconstituted protein solution can be stored at 4-8°C for 2-7 days. Aliquots of reconstituted samples are stable at < -20°C for 3 months.