Protein Laboratories Rehovot Ltd.
January 2018

Certificate of Analysis & Data Sheet

We are the ONLY company producing leptin antagonists and leptins of farm animals including several fish species.

Pegylated human, mouse, rat and ovine leptins and corresponding leptin antagonists are now available!!!

PLR provides a novel service of pegylation of either existing, or provided or custom-made proteins. All PLR's proteins are carrier free (cf) and can be sold in any requested amount !!!
Human pegylated interleukin 22 - CYT-18
Description: Mono-pegylated (with 20 kDa PEG)recombinant human interleukin 22 is one polypeptide chain containing 147 amino, an additional Ala at N-terminus and one molecule of PEG 20 kDa at its N-terminus, having an expected molecular mass of ~ 36 kDa as determined by MS. However due to enlarged hydrodymanic volume it runs on the SGS-Page as 50 kDa protein and in gel-filtration on Superdex 200 as over 200 kDa protein. It was prepared similarly to that described by L. Niv-Spector et al. Protein Eng Des Sel. (PEDS) 25:397-404 (2012).  
Source: E. coli 
Lot Number:  
Quantity Shipped:  
Physical Appearance: White lyophilized (freeze-dried) powder. 
Formulation: The protein was lyophilized from a concentrated (0.65mg/ml) solution with 0.003mM NaHCO3.

 
Solubility: It is recommended to reconstitute the lyophilized pegylated mouse IL22 in sterile water or sterile 0.4% NaHCO3 adjusted to pH 8-9, not less than 100µg/ml, which can then be further diluted with other aqueous solutions.  
Stability: Lyophilized pegylated human IL22 although stable at room temperature for several days, should be stored desiccated below -20C. Upon reconstitution at > 0.1 pegylated mIL22 mg/ml and up to 2 mg/ml and filter sterilization it can be stored at 4C or even room temperature for several weeks making it suitable for long term infusion studies using osmotic pumps. At lower concentration addition of a carrier protein (0.1% HSA or BSA) is suggested. Please prevent freeze-thaw cycles. 
Purity: Greater than 98.0% as determined by:
(a) Gel filtration analysis.
(b) Analysis by reducing and non-reducing SDS-PAGE gel.

 
Amino Acid Sequence: The sequence of the N-terminal amino acids could not be determined indicating that the PEG moiety is attached to the N-terminus. 
Dimers and Aggregates: The purified mouse pegylated IL22 consists of > 90% monomers as determined by gel-filtration chromatography.

 
Biological Activity: PLR’s human IL-22 is biologically active when compared to standard using STAT3 phosphorylation assay in HepG2 cells. Its acrtivity in vitro is ~ 10% compared to the non-pegylated mIL22.
 
Endotoxin: Less than 0.05 ng/µg (0.5 EU/µg) of recombinant pegylated IL-22.
 
Protein content: Protein quantitation was carried out by UV spectroscopy at 280 nm using the absorbency value of 0.26 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the DNAman computer analysis program of protein sequences.
 
Usage: PRL's products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.  
Date Shipped: 30.11.2012