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cusabio

Protein

Protein

CusAb provides "No risk" custom service for millions of recombinant proteins in different species.
Features:
* No risk. No protein, No charge.
* Competitive price as low as $689/mg.
* 39 kinds of tags meeting different demands.
* Secondary AKTA-SEC purification to ensure high purity.
* Good capacity and experience for large-scale expression (10mg, 50mg, 100mg, 200mg available).
* Proteins with different sizes (5ug, 10ug, 20ug, 50ug, 100ug, 500ug, 1mg, ect).
* Multiple expression systems are available including E.coli, yeast, insect cells, mammalian cells and in vitro (cell free) expression system. (Please see 'The Characteristics of Five Expression Systems' below)

Note: This no risk custom service is only suitable for proteins within 800aa.We will charge according to different steps if you need to express proteins more than 800aa.

You can choose either way to request for the quotation:

1.

You can use Protein name / Cat No / Alias / Abbreviations / Uniprot No to search your desired protein in our database, which contain millions of proteins, then you can request the quotation through the livechat or “contact us”directly.

2.

If you can’t search the protein of your interest, please complete the online “Customized Protein Information Collection Form”, your information will be strictly protected and will not be disclosed to the third party, we will reply you by email within 24 hours.

The Characteristics of Five Expression Systems

Escherichia coli (E.coli) expression system

Advantages

  • 1.

    Clear genetic background;

  • 2.

    Low cost and simple culture conditions;

  • 3.

    Simple transformation operation;

  • 4.

    Short protein expression period;

  • 5.

    High rate of reproduction and expression level;

  • 6.

    A variety of carriers and fusion tags to choose;

  • 7.

    Many parameters can be altered to optimize expression.

  • 8.

    Tag can be available at both N-terminal and C-terminal with an enzyme cutting site that is easy to cut.

Disadvantages

  • 1.

    Inefficient disulfide bond formation and poor folding lead to inclusion body formation;

  • 2.

    Poor post-translational modifications (such as glycosylation, alkylation, phosphorylation, specificity of proteolytic processing, etc.);

  • 3.

    The success rate and recovery rate of inclusion body renaturation is not very high.

Applications

  • Purified protein (structure, enzymology, drug discovery);
  • Protein therapeutics.
Pichia pastoris (Yeast) expression system

Advantages

  • 1.

    Low cost and high expression level;

  • 2.

    Self-produced Endotoxin-free;

  • 3.

    Efficient protein folding and secretory expression;

  • 4.

    Simple culture conditions and purification operation;

  • 5.

    Extensive post-translational modifications: Glycosylation, phosphorylation, acyl lipid;

  • 6.

    Can develop high density fermentation by using simple inorganic salt, large biomass;

  • 7.

    The protein is more stable than the prokaryotic expression, and is especially suitable for the expression of eukaryotic genes and the preparation of functional expression proteins;

  • 8.

    Simple laboratory and industrial operation.

Disadvantages

  • 1.

    Glycosylation modification is not good as mammalian cells.

Applications

  • Purified protein (structure, enzymology, drug discovery).
Baculovirus-infected insect cells expression system

Advantages

  • 1.

    Good expression levels and relatively rapid growth;

  • 2.

    More advantages over the expression of viral proteins;

  • 3.

    Glycosylation modification more like mammalian cells;

  • 4.

    Relatively de-glycosylation modification (good for structure determination);

  • 5.

    Large gene volume: because the baculovirus genome is larger, so it can carry large gene fragment;

  • 6.

    High security: the baculovirus has a strict species specificity, not infected with vertebrates and plants;

  • 7.

    High expression efficiency of exogenous gene: compared with other eukaryotic expression systems, the baculovirus system can efficiently express exogenous protein from infected cells;

  • 8.

    The expression product has high activity: baculovirus will proliferation in insect host cells, thus resulting recombinant protein will be similar to mammalian cells in post-translational modification, the expression product has a strong biological activity;

  • 9.

    Easy to amplify: baculovirus can mass production of recombinant protein products with biological activity.

Disadvantages

  • 1.

    Expensive culture media cost;

  • 2.

    Inefficient processing of pro-peptides in secretory pathway;

  • 3.

    Viral infection leads to cell lysis and potential degradation of expressed proteins;

  • 4.

    Glycosylation modification is not good as mammalian cells.

Applications

  • Purified protein (structure, enzymology, drug discovery).
Mammalian cells expression system

Advantages

  • 1.

    Self-produced Endotoxin-free;

  • 2.

    Efficient protein folding and secretory expression;

  • 3.

    All post-translational modifications, provide a variety of complex N glycosylation and accurate O type glycosylation and other post-translational processing functions;

  • 4.

    The expressed products are closest to the natural biological proteins in molecular structure, physical and chemical properties and biological functions.

Disadvantages

  • 1.

    Expensive culture media cost;

  • 2.

    Complex growth requirements.

Applications

  • Purified protein (structure, enzymology, drug discovery);
  • Protein therapeutics;
  • Cell-based studies.
Cell-free expression system

Advantages

  • 1.

    High expression level: we provide the original and optimized pET carrier with a series of labels, so that the membrane protein yield can reach mg grade;

  • 2.

    Protein synthesis conditions can be manipulated;

  • 3.

    The target fusion protein with 6*His is beneficial to the purification.

Disadvantages

  • 1.

    Limited post-translational modifications;

  • 2.

    Expensive for scale-up.

Applications

  • Purified protein (structure, enzymology, drug discovery);
  • In vitro expression cloning;
  • Isotopic labelling of proteins for NMR;
  • Incorporation of non-natural amino acids.

Protein

Advanced Search

  • Product Name Code Size
    Recombinant Rat D(2) dopamine receptor(Drd2), partial CSB-YP007179RA1 1mg
    Recombinant Human DNA repair protein RAD51 homolog 1(RAD51),Mammalian cell CSB-MP019263HU 1mg/500ug/100ug/50ug
    Recombinant Rubella virus Structural polyprotein, partial CSB-YP324845ROR1 1mg
    Recombinant Rat C-X-C chemokine receptor type 7(Cxcr7), partial CSB-YP006257RA1 1mg
    Recombinant Rat C-X-C chemokine receptor type 4(Cxcr4), partial CSB-YP006254RA1 1mg
    Recombinant Rabies virus Glycoprotein G(G) ,partial CSB-YP339275RAE1 1mg
    Recombinant Invasin ipaB(ipaB), partial CSB-YP322404SZB 1mg
    Recombinant Rabbit Type-1 angiotensin II receptor(AGTR1), partial CSB-YP001465RB1 1mg
    Recombinant Thermosynechococcus elongatus Photosystem II protein D1 1(psbA1),partial CSB-YP363494TDQ1 1mg
    Recombinant Human Muscle, skeletal receptor tyrosine-protein kinase(MUSK),partial CSB-CF015241HU 10μg/50μg/100μg
    Recombinant Human Neuronal acetylcholine receptor subunit alpha-3(CHRNA3), partial CSB-YP005389HU1 1mg
    Recombinant Escherichia coli Probable diguanylate cyclase AdrA(adrA), partial CSB-YP364529ENV1 1mg
    Recombinant Human Adenosine receptor A1(ADORA1), partial CSB-YP001375HU1 1mg
    Recombinant Human Glutamate receptor 2(GRIA2) ,partial CSB-EP009899HU 1mg/500ug
    Recombinant Mouse Asc-type amino acid transporter 1(Slc7a10), partial CSB-YP021710MO1 1mg
    Recombinant Mouse C5a anaphylatoxin chemotactic receptor(C5ar1), partial CSB-YP003996MO1 1mg
    Recombinant Human Band 3 anion transport protein(SLC4A1) ,partial CSB-YP021663HU 1mg
    Recombinant Human Gap junction alpha-1 protein(GJA1), partial CSB-YP009443HU1 1mg
    Recombinant Mouse Endothelin B receptor(Ednrb), partial CSB-YP007404MO1 1mg
    Recombinant Human UDP-GalNAc:beta-1,3-N-acetylgalactosaminyltransferase 1(B3GALNT1), partial CSB-YP002488HU1 1mg

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