Recombinant Human SDF-1 alpha (rHuSDF-1 alpha/CXCL12- alpha)

SKU: orb1495023

Description

SDF-1α and SDF-1β, members of the chemokine α subfamily that lack the ELR domain, were initially identified using the signal sequence trap cloning strategy from a mouse bone-marrow stromal cell line. These proteins were subsequently also cloned from a human stromal cell line as cytokines that supported the proliferation of a stromal cell-dependent pre-B-cell line. SDF-1α and SDF-1β cDNAs encode precursor proteins of 89 and 93 amino acid residues, respectively. Both SDF-1α and SDF-1β are encoded by a single gene and arise by alternative splicing. The two proteins are identical except for the four amino acid residues that are present in the carboxy-terminus of SDF-1β and absent from SDF-1α. SDF-1/PBSF is highly conserved between species, with only one amino acid substitution between the mature human and mouse proteins. SDF-1/PBSF acts via the chemokine receptor CXCR4 and has been shown to be a chemoattractant for T-lymphocytes, monocytes, pro- and pre- B cells, but not neutrophils.

Images & Validation

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Application Notes	We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Reconstitute in sterile distilled water or aqueous buffer containing 0.1% BSA to a concentration of 0.1-1.0 mg/mL. Stock solutions should be apportioned into working aliquots and stored at < -20°C. Further dilutions should be made in appropriate buffered solutions.

Key Properties

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Source	Escherichia coli.
Biological Activity	Fully biologically active when compared to standard. Determined by its ability to chemoattract human peripheral T cells activated with PHA and IL-2 using a concentration range of 20.0-80.0 ng/ml, corresponding to a Specific Activity of ＞1.25 x 104 IU/mg.
Molecular Weight	8.0 kDa, a single non-glycosylated polypeptide chain containing 68 amino acids.
Protein Sequence	KPVSLSYRCP CRFFESHVAR ANVKHLKILN TPNCALQIVA RLKNNNRQVC IDPKLKWIQE YLEKALNK
Purification	>97% by SDS-PAGE and HPLC analyses.
Purity	>97% by SDS-PAGE and HPLC analyses.
Endotoxins	Less than 1EU/μg of rHuSDF-1 alpha as determined by LAL method.

Storage & Handling

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Storage	This lyophilized preparation is stable at 2-8°C, but should be kept at -20°C for long term storage, preferably desiccated. Upon reconstitution, the preparation is stable for up to one week at 2-8°C. For maximal stability, apportion the reconstituted preparation into working aliquots and store at -20°C to -70°C. Avoid repeated freeze/thaw cycles.
Form/Appearance	Lyophilized from a 0.2μm filtered concentrated solution in 20mM PB, pH 130mM NaCl.
Buffer/Preservatives	Lyophilized from a 0.2μm filtered concentrated solution in 20mM PB, pH 130mM NaCl.
Disclaimer	For research use only

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