Measured by its ability to produce hydrogen peroxide during the oxidation of phenylalanine. The specific activity is >100 pmol/min/μg, as measured under the described conditions.
Source
Chinese Hamster Ovary cell line, CHO-derived mouse IL-4I1 protein Leu21-Ser630, with a C-terminal 6-His tag
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Note
<1.0 EU per 1 μg of the protein by the LAL method.
Applications/Dilutions
Dilutions
Bioactivity
Theoretical MW
69 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
86 kDa, reducing conditions
Publications
Read Publications using 5576-AO in the following applications:
Substrate Component 1: Phenylalanine (Sigma, Catalog # P2126), 100 mM stock in diH2O
Substrate Component 2: Amplex Ultra Red (AUR) (Molecular Probes, Catalog # A36006), 10 mM stock in DMSO
F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
Dilute rmIL-4I1 to 2 ng/µL in Assay Buffer.
Prepare the Substrate mixture including 2 mM Phenylalanine, 2 units/mL HRP and 100 µM AUR in Assay Buffer.
Load in a black well plate 50 µL of 2 ng/µL of rmIL-4I1, and start the reaction by adding 50 µL of the Substrate mixture (step 2). Include a Substrate Blank containing 50 µL of the Assay Buffer and 50 µL of the Substrate mixture.
Read at excitation and emission wavelengths of 544 nm and 590 nm (top read), respectively in kinetic mode for 5 minutes. Note: A wavelength cutoff of 570 nm should be manually specified.
Calculate specific activity:
Specific Activity (pmol/min/µg) =
Adjusted Vmax* (RFU/min) x Conversion Factor** (pmol/RFU)
amount of enzyme (µg)
*Adjusted for Substrate Blank **Derived using a fluorescent standard prepared by incubating 50 µM AUR, 1 unit/mL HRP, 1 mM Phenylalanine, and a range of Hydrogen Peroxide (0-500 pmol) (Sigma, Catalog # H1009) in Assay Buffer at room temperature. Use the resulting amounts of oxidized AUR to determine the conversion factor.
Per Well:
rmIL-4I1: 0.1 µg
Phenylalanine: 1 mM
HRP: 1 unit/mL
AUR: 50 µM
Caution: The rmIL-4I1 enzymatic reaction may significantly be interfered with organic buffer such as MES.
Notes
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for Recombinant Mouse IL-4I1 Protein, CF
Fig-1 protein
FIG1
hFIG1
IL4I1
IL-4I1
IL4-induced protein 1
interleukin 4 induced 1
interleukin four induced 1
LAAO
L-amino-acid oxidase
LAO
UNQ636/PRO1265
Background
Interleukin four-induced gene 1 (IL-4I1) was first identified in mouse B cells as part of the response to IL-4, a key regulator of the immune response (1). Later, the enzyme was shown to be a member of the flavin-containing amino acid oxidase family and closely related to L-amino acid oxidases (2, 3). Enzymological characterization reveals that IL-4I1 has L-amino acid oxidase activity with preference toward aromatic amino acids (4). Its limited expression in immune tissues, dendritic cells, and macrophages indicates that it may play an important function in the immune system (5, 6).
Chu, C.C. and W.E. Paul (1997) Proc. Natl. Acad. Sci. USA 94:2507.
Raibekas, A.A. and V. Massey (1998) Biochem. Biophys. Res. Comm. 248:476.
Chavan, S.S. et al. (2002) Biochim. Biophys. Acta 1576:70.
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