Formulation & Packaging:
The protein was lyophilized after extensive dialysis against 2mM sodium phosphate buffer pH= 7.4±0.1.
The lyophilized rHuGM-CSF is very soluble in water and most aqueous buffers below and above the isoelectric point (pI=4.95).
Lyophilized mGMPrHuGM-CSF although stable at room temperature, should be stored desiccated below 0°C. Reconstituted rHuGM-CSF is best stored refrigerated at 4°C.
Purity: Greater than 99.0% as determined by:
(a) Analysis by RP-HPLC
(b) Anion-exchange FPLC.
(c) Analysis by reducing and non-reducing SDS-PAGE Silver Stained
(Limit of acceptance:³98.0%. No more than 2% total impurities; no single impurity greater than 1%)
Amino Acid Composition:
In total agreement with the expected amino acid composition of native human GM-CSF.
Amino acid sequence:
The sequence of the first five N-terminal amino acids was determined and was found to be Ala-Pro-Ala-Arg-Ser, conforming the sequence of native human GM-CSF. N-terminal methionine has been completely removed enzymatically.
Dimers and aggregates:
Less than 1% as determined by silver stained SDS-PAGE gel analysis.
mGMPrHuGM-CSF is fully biologically active when compared to standard.The ED50 as determined by the dose-dependant stimulation of the proliferation of human TF-1 cells (human erythroleukemic indicator cell line) is 0.1 ng/ml, corresponding to a Specific Activity of 9x106 IU/mg or 2 800 000 IU/ vial of 300 ug
Less than 0.1 ng/µg (IEU/µg) of mGMPrHuGM-CSF.
Protein content:Protein quantitation was carried out by two independent methods:
1. UV spectroscopy at 280 nm using the absorbency value of 0.963 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics).
2. Analysis by RP-HPLC, using a standard solution of GM-CSF as a Reference Standard.
This material is offered by Gentaur for research, laboratory or further manufacturing purposes adn DC culture