Recombinant Human Pappalysin-2/PAPP-A2 Protein, CF Summary
Details of Functionality
Measured by its ability to cleave IGFBP-5. Cleavage of Recombinant Human IGFBP‑5 (Catalog # 875-B5) by Recombinant Human Pappalysin‑2/PAPP‑A2 is detectable by SDS-PAGE stained by Coomassie, as measured under the described conditions.
Source
Mouse myeloma cell line, NS0-derived human Pappalysin-2/PAPP-A2 protein Ser234-Cys1396, with a C-terminal 10-His tag
>90%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Note
<1.0 EU per 1 μg of the protein by the LAL method.
Applications/Dilutions
Dilutions
Enzyme Activity
Theoretical MW
130 kDa. Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
SDS-PAGE
168 kDa, reducing conditions
Publications
Read Publications using 1668-ZN in the following applications:
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
6 months from date of receipt, -20 to -70 °C as supplied.
3 months, -20 to -70 °C under sterile conditions after opening.
Buffer
Supplied as a 0.2 μm filtered solution in Tris, NaCl and CaCl2.
Purity
>90%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Assay Procedure
Assay Buffer: 50 mM Tris, pH 8.0
Recombinant Human Pappalysin-2/PAPP-A2 (rhPappalysin-2) (Catalog # 1668-ZN)
Recombinant Human IGFBP‑5 (rhIGFBP-5) (Catalog # 875-B5)
15% SDS-PAGE gel
Reducing SDS-PAGE gel buffer
SDS-PAGE or Western Blot
Dilute rhPappalysin-2 to 40 µg/mL in Assay Buffer.
Dilute rhIGFBP-5 to 200 µg/mL in Assay Buffer (Note: Acetonitrile interferes with assay, dry down rhIGFBP-5 and reconstitute at 200 µg/mL with Assay Buffer if necessary).
Combine equal volumes of 40 µg/mL rhPappalysin-2 and 200 µg/mL rhIGFBP-5 for a 1:23.5 ratio of enzyme to Substrate. Include two blank controls containing Assay Buffer in place of rhPappalysin-2.
Incubate reaction vials and one control at 37 °C overnight. Keep the other control at -20 °C during the overnight incubation period.
Combine 20 µL from each reaction vial with 20 µL reducing SDS-PAGE gel buffer.
Analyze the cleavage by SDS PAGE (load 40 µL/lane) followed by protein staining and/or Western blot.
Per Lane:
rhPappalysin-2: 0.4 µg
rhIGFBP-5: 2.0 µg
Notes
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for Recombinant Human Pappalysin-2/PAPP-A2 Protein, CF
EC 3.4.24.-
PAPPA2
PAPP-A2
PAPP-A2pappalysin-2
pappalysin 2
Pappalysin2
Pappalysin-2
PAPPE
PAPP-E
PLAC3
placenta-specific 3
pregnancy-associated plasma preproprotein-A2
Pregnancy-associated plasma protein A2
Pregnancy-associated plasma protein E1
Background
Pappalysins belong to a fifth family of metzincins that consists of ADAMs/ADAMTSs, MMPs, astacins and serrylysins (1, 2). PAPP-A is an important pregnancy protein and increases in plasma by a factor of about 150 during pregnancy as compared to the nonpregnant state. PAPP-A is also a major marker of Down syndrome in the first trimester of pregnancy because maternal serum levels of PAPP-A are significantly reduced when a fetus affected by Down syndrome is present (3). PAPP-A cleaves Insulin-like Growth Factor-Binding Protein-4 and -5 (IGFBP-4 and -5) at a single site, resulting in the release of bioactive IGF (4). Compared to PAPP‑A, PAPP-A2 (also called PAPP‑E), the second member of the family is less characterized. PAPP-A2 shares 45% amino acid identity to PAPP-A in the mature form, which is synthesized as a preproprotein consisting of multiple domains (1). The prepro region (residues 1‑233) and the C-terminal region (residues 1397‑1791) are not included in recombinant human PAPP-A2. As an active protease, recombinant human PAPP-A2 cleaves IGFBP-5 under the conditions described in Activity Assay Protocol.
Overgaard, M.T. et al. (2001) J. Biol. Chem. 276:21849.
Boldt, H.B. et al. (2001) Biochem. J. 358:359.
Fialova L. and I.M. Malbohan (2002) Bratisl. Lek. Listy 103:194.
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