Semaphorins are a large group of structurally related secreted, GPI-anchored and transmembrane cell signaling molecules. There are 8 major classifications (1-7) of Semaphorins characterized by the existence of a conserved 500aa SEMA domain at the amino terminus. Classes 3, 4, 6, and 7 are found in vertebrates only, whilst class 5 is found in both vertebrates and invertebrates. Each class is then divided into additional subgroups based on shared structural characteristics. Semaphorins primarily function as axon growth cone guidance factors during neuronal development. Semaphorin 3A acts as a chemo-repellent to axons, and an inhibitor of the growth of axons by signaling through receptors, Neuropilin-1and Plexin-A. Recombinant human Semaphorin 3A is a 751aa protein containing the SEMA domain, an immunoglobulin c2-like domain and a basic domain (Arg/Lys rich) near the C-terminus.||Source:|Recombinant protein corresponding to human Semaphorin 3A, expressed in CHO cells.||Molecular Weight: |~90kD||Biological Activity:|Determined by its ability to bind recombinant rat Neuropilin-1 Fc Chimera in a functional ELISA assay.||Endotoxin:|<0.1ng/ug of protein (<1EU/ug)||AA Sequence:|NYQNGKNNVP RLKLSYKEML ESNNVITFNG LANSSSYHTF LLDEERSRLY VGAKDHIFSF DLVNIKDFQK IVWPVSYTRR DECKWAGKDI LKECANFIKV LKAYNQTHLY ACGTGAFHPI CTYIEIGHHP EDNIFKLENS HFENGRGKSP YDPKLLTASL LIDGELYSGT AADFMGRDFA IFRTLGHHHP IRTEQHDSRW LNDPKFISAH LISESDNPED DKVYFFFREN AIDGEHSGKA THARIGQICK NDFGGHRSLV NKWTTFLKAR LICSVPGPNG IDTHFDELQD VFLMNFKDPK NPVVYGVFTT SSNIFKGSAV CMYSMSDVRR VFLGPYAHRD GPNYQWVPYQ GRVPYPRPGT CPSKTFGGFD STKDLPDDVI TFARSHPAMY NPVFPMNNRP IVIKTDVNYQ FTQIVVDRVD AEDGQYDVMF IGTDVGTVLK VVSIPKETWY DLEEVLLEEM TVFREPTAIS AMELSTKQQQ LYIGSTAGVA QLPLHRCDIY GKACAECCLA RDPYCAWDGS ACSRYFPTAK RRTRRQDIRN GDPLTHCSDL HHDNHHGHSP EERIIYGVEN SSTFLECSPK SQRALVYWQF QRRNEERKEE IRVDDHIIRT DQGLLLRSLQ QKDSGNYLCH AVEHGFIQTL LKVTLEVIDT EHLEELLHKD DDGDGSKTKE MSNSMTPSQK VWYRDFMQLI NHPNLNTMDE FCEQVWKRDR KQRRQRPGHT PGNSNKWKHL QENKKGRNRR THEFERAPRS V||Storage and Stability:|Lyophilized powder may be stored at -20°C. Stable for 12 months after receipt at -20°C. Reconstitute with sterile ddH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Reconstituted product is stable for 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.

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