Secreted proteins
	Secreted proteins typically have an N-terminal hydrophobic signal sequence which facilitates their translocation into the endoplasmic reticulum (ER). Many secreted proteins are N-glycosylated on Asn-X-Ser/Thr motif in the ER, and disulfide bond formation is also accomplished in the ER. N- or C-terminal 8xHis tag can be provided to facilitate target protein affinity purification and immunodetection. Secreted proteins can be also expressed in fusion with MBP tag, which could improve protein solubility. We offer a variety of vectors to facilitate these processes.
	Mix and match features provided in the vectors
		pAB-bee™ encodes powerful signal sequence pAB-bee™-8xHis encodes powerful signal sequence and His-tag, which facilitates purification by immobilized metal affinity chromatography ProFold™-ER1 provides Calreticulin, a major molecular chaperone facilitating glycoprotein folding, and PDI which facilitates the correct formation of disulfide bonds pAB-6xHis-MBP can provide C-terminal MBP tag to reduce protein aggregation
	The above features can be mixed and matched in various combinations, while supporting a high level of target protein expression. They can also be combined with "plain vectors" which only provide a high level of protein expression (pVL1393, ProEasy™, ProGreen™, ProFold™-0). A plasmid transfer vector is always combined with a baculovirus DNA vector, and some combinations are available as Kits. Click on MATERIALS AND METHODS for details.
	Examples
	1.Target protein has a large ectodomain, a weak signal sequence, is known to be glycosylated, and has multiple cysteines. Insert gene encoding mature target protein into pAB-bee™ plasmid vector in lieu of the powerful insect signal sequence and co-transfect with ProFold™-ER1 linearized baculovirus DNA.
	2.Target protein has no N-terminal signal sequence. Its ectodomain is known to be glycosylated and has multiple cysteines. Insert gene encoding entire ORF of the target protein into pVL1393 plasmid vector and co-transfect with ProFold™-ER1 linearized baculovirus DNA.
	3.Target protein has a strong N-terminal signal sequence. Its ectodomain is known to be glycosylated and has multiple cysteines. Insert gene encoding the entire ORF of the target protein into pVL1393 plasmid vector and co-transfect with ProFold™-ER1 linearized baculovirus DNA.
	Signal sequence in secreted proteins
	A hydrophobic signal peptide sequence which is followed by a signal peptidase cleavage site is often present on the N-terminus of transmembrane proteins. However, some signal peptides are less efficient than others. The cleavage sites also may differ in their efficiency. You can evaluate your target protein for the presence of a signal peptide and its cleavage site using the TargetP program (Emanuelson O. et al., J.Mol.Biol., 300: 1005-10016, 2000). The program is user friendly and is available at http://www.cbs.dtu.dk/services/TargetP/
	An inefficient signal peptide or its incomplete cleavage is likely to result in the misfolding of a significant portion of the expressed protein and in an accumulation of inclusion bodies or protein degradation. In such cases the inefficient native target protein signal sequence can be substituted for a signal sequence which is optimized for a particular protein expression system.
	Relevant products
	Plasmid transfer vectors                             Click on the product name for technical information! Cat # Product Specification Unit size Price* B1 pVL1393 High level of target protein expression 50 μl, 0.5 μg/μl $295.00 B3 pAB-bee Provides target proteins with powerful honeybee melittin signal sequence to      facilitate translocation into the ER Recommended for high level expression of secreted and transmembrane proteins 50 μl, 0.5 μg/μl $495.00 B3H pAB-bee™-8xHis Provides target proteins with powerful honeybee melittin signal sequence to      facilitate translocation into the ER Recommended for high level expression of secreted and transmembrane proteins N- or C-terminal 8xHis tag for affinity purification 50 μl, 0.5 μg/μl $495.00 B7 pAB-6xHis-MBP™ High level expression of proteins with cleavable N-terminal 6xHis MBP tag High level expression of proteins with C-terminal MBP tag MBP tag improves protein solubility and yield 50 μl, 0.5 μg/μl $495.00   Linearized baculovirus vector DNA CsCl purified and digested with Bsu 36.I                  Click on the product name for technical information! Cat # Product Specification Unit size Price* A1 ProGreen™ High level of target protein expression GFP reporter to monitor virus propagation 25 μl, 2.5 μg 5 transfections $199.00 A3 ProFold™-C2 Overexpressed Hsp40 and Hsc70 chaperones facilitate target protein folding in the      cytoplasm GFP reporter to monitor virus propagation Slightly reduced level of protein expression 25 μl, 2.5 μg 5 transfections $695.00 A4 ProFold™-ER1 Overexpressed calreticulin facilitates glycoprotein folding in the ER Overexpressed PDI facilitates folding of cysteine-rich proteins GFP reporter to monitor virus propagation High level of target protein expression 25 μl, 2.5 μg 5 transfections $695.00 A9 ProFold™-0 The best value baculovirus vector High level of target protein expression 25 μl, 2.5 μg 5 transfections $195.00 A10S ProEasy™ The easiest generation of recombinant baculoviruses Ideal for HST applications High level of target protein expression 25 μl, 2.5 μg 5 transfections $599.00   Controls                                                                    Click on the product name for technical information! Cat # Product Specification Unit size Price* C13 NC (negative control) Recombinant baculovirus stock Extracts of cells infected with NC is an ideal negative control as there is no      polyhedrin or target protein expression NC extracts are run side by side in SDS-PAGE with extracts of cells infected with      recombinant baculoviruses Recombinant protein is detected as a prominent band which is absent in NC      extracts 1 ml, 108 p.f.u./ml $195.00 C14 GC (green control) Recombinant baculovirus stock Positive control baculovirus in experiments where GFP fluorescence is used to      monitor virus propagation, optimize cultivation conditions, or titrate of virus stocks 1 ml, 108 p.f.u./ml $195.00 C15 GCP (green control plasmid) Plasmid transfer vector DNA Positive control for transfection with linearized GFP- baculovirus DNA. Green      fluorescence of cells is indicative of successful transfection. 50 μl, 0.2 μg/μl $145.00
	*Pricing and online ordering is for US and Canadian customers only. Contact Tel: 1-866-683-2867, Fax 1-760-454-2465, email info@abvector.com to order in North America. Go to PRODUCTS page to order on line. For international ordering go to Order page or Home page.
	If you have not worked with recombinant baculoviruses, you can get a quick update at MATERIALS AND METHODS.
	Click on PRODUCTS to view the entire list of recombinant baculovirus-related products.

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