Midkine

Midkine (MK) and its functionally-related protein Pleiotrophin are heparin-binding neurotrophic factors that signal through the same receptor, known as anaplastic lymphoma kinase (ALK) . MK plays an important regulatory role in epithelial-mesenchymal interactions during fetal development and in postnatal lung development. MK chemoattracts embryonic neurons, neutrophils and macrophages, and by signaling through the ALK receptor it exerts angiogenic, growth and survival activities during tumorgenesis. Recombinant human Midkine is a 13.4 kDa protein containing 123 amino acid residues including five intra-molecular disulfide bonds.

Product Specifications

Synonyms

MDK; MK; NEGF2

NCBI Gene ID

4192

UniProt

P21741

Accession Number

NP_001012333

Accession Number mRNA

NM_001012333

Chromosomal Location

11p11.2

Reactivity

Human

Cross Reactivity

Mouse, Pig, Shark, Human, Hagfish, Squid

Sequence

VAKKKDKVKK GGPGSECAEW AWGPCTPSSK DCGVGFREGT CGAQTQRIRC RVPCNWKKEF GADCKYKFEN WGACDGGTGT KVRQGTLKKA RYNAQCQETI RVTKPCTPKT KAKAKAKKGK GKD

Assay Protocol

Centrifuge the vial prior to opening. Reconstitute in water to a concentration of 0.1-1.0 mg/ml. Do not vortex. This solution can be stored at 2-8°C for up to 1 week. For extended storage, it is recommended to further dilute in a buffer containing a carrier protein (example 0.1% BSA) and store in working aliquots at ‑20°C to -80°C.

Endotoxin

< 0.1 ng/µg of protein (< 1EU/µg)

Purity

> 98% by SDS-PAGE & HPLC analyses

Bioactivity

Determined by its ability to chemoattract human neutrophils using a concentration range of 0.1-10.0 ng/ml.

Length

123

Form

Lyophilized

Buffer

0.4x PBS, pH 7.4

Reconstitution

Water

Molecular Weight

13.4 kDa

Storage Conditions

The lyophilized protein is stable at room temperature for 1 month and at 4°C for 6 months. Reconstituted working aliquots are stable for 1 week at 2°C to 8°C and for 3 months at -20°C to -80°C.