Total 149 AA. MW: 17.36 kDa (calculated). UniProtKB acc.no. Q9UHV8. N-Terminal His-tag (10 extra AA)
Amino Acid Sequence
14% SDS-PAGE separation of Human PP13
1. M.W. marker – 14, 21, 31, 45, 66, 97 kDa
2. reduced and boiled sample, 5μg/lane
3. non-reduced and non-boiled sample, 5μg/lane
< 1.0 EU/μg
Filtered (0.4 μm) and lyophilized in phosphate buffered saline pH 7.5.
Add deionized water to prepare a working stock solution of 0.5 mg/mL and let the lyophilized pellet dissolve completely. Filter sterilize your culture media/working solutions containing this non-sterile product before using in cell culture.
Western blotting, ELISA, Immunoassays
At ambient temperature. Upon receipt, store the product at the temperature recommended below.
Store the lyophilized protein at –80 °C. Lyophilized protein remains stable until the expiry date when stored at –80 °C. Aliquot reconstituted protein to avoid repeated freezing/thawing cycles and store at –80 °C for long term storage. Reconstituted protein can be stored at 4 °C for a week.
Quality Control Test
BCA to determine quantity of the protein.
SDS PAGE to determine purity of the protein.
LAL to determine quantity of endotoxin.
Placental protein 13 (PP13, Galectin 13) is the member of the beta-galactoside binding S-type galectin superfamily, whose members are important in placenta implantation and remodelling of maternal arteries. PP13 binds to beta-galactoside residues of several proteins on the cell surface, cytoskeleton and extracellular matrix, thereby generating various responses such as immune responses and influencing other functions like apoptosis and molecular recognition. PP13, which is predominantly produced by placental tissue, possesses a conserved carbohydrate binding domain, to which two proteins Annexin-II and Actin-beta bind. These proteins are considered to play a key role in placentation and maternal artery remodelling respectively. Human PP13 is a relatively small protein with 139 amino acids and is composed of two identical 16 kDa subunits held together by disulfide bonds. PP13 was first isolated from placenta and especially from the syncytiotrophoblast in 1983 by Bohn et. al. It is localized to the syncytiotrophoblast brush border membrane, and detected in maternal and cord blood. Though it is found primarily in placenta, some PP13 expression was also detected in healthy spleen, kidney and bladder tissue and in liver adenocarcinoma, neurogen tumour and malignant melanoma. The serum levels of PP13 slowly increase during a normal pregnancy but abnormally low levels of PP-13 were detected in first trimester serum samples of women subsequently developing fetal growth restriction and preeclampsia, especially in cases with early onset. Elevated serum concentrations of PP-13 have been found in the second and third trimester in women with preeclampsia, intrauterine growth restriction (IUGR) and in preterm delivery. Another study concluded that first-trimester serum levels of PP13 may serve as a suitable marker for preterm preeclampsia but are weak for the prediction of severe preeclampsia and ineffective for mild preeclampsia at term.