Recombinant Human papillomavirus type 16 protein E4 (E4)

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Code CSB-EP356968HML
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Size US$388
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  • Based on the SEQUEST from database of E.coli host and target protein, the LC-MS/MS Analysis result of CSB-EP356968HML could indicate that this peptide derived from E.coli-expressed Human papillomavirus type 16 E4.
  • Based on the SEQUEST from database of E.coli host and target protein, the LC-MS/MS Analysis result of CSB-EP356968HML could indicate that this peptide derived from E.coli-expressed Human papillomavirus type 16 E4.
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Product Details

Purity
Greater than 85% as determined by SDS-PAGE.
Target Names
E4
Uniprot No.
Research Area
Neuroscience
Alternative Names
E4; Protein E4; E1^E4
Species
Human papillomavirus type 16
Source
E.coli
Expression Region
1-92aa
Target Protein Sequence
MADPAAATKYPLLKLLGSTWPTTPPRPIPKPSPWAPKKHRRLSSDQDQSQTPETPATPLSCCTETQWTVLQSSLHLTAHTKDGLTVIVTLHP
Note: The complete sequence including tag sequence, target protein sequence and linker sequence could be provided upon request.
Mol. Weight
17.5 kDa
Protein Length
Full Length
Tag Info
N-terminal 10xHis-tagged and C-terminal Myc-tagged
Form
Liquid or Lyophilized powder
Note: We will preferentially ship the format that we have in stock, however, if you have any special requirement for the format, please remark your requirement when placing the order, we will prepare according to your demand.
Buffer
Tris-based buffer,50% glycerol
Reconstitution
We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Please reconstitute protein in deionized sterile water to a concentration of 0.1-1.0 mg/mL.We recommend to add 5-50% of glycerol (final concentration) and aliquot for long-term storage at -20°C/-80°C. Our default final concentration of glycerol is 50%. Customers could use it as reference.
Troubleshooting and FAQs
Storage Condition
Store at -20°C/-80°C upon receipt, aliquoting is necessary for mutiple use. Avoid repeated freeze-thaw cycles.
Shelf Life
The shelf life is related to many factors, storage state, buffer ingredients, storage temperature and the stability of the protein itself.
Generally, the shelf life of liquid form is 6 months at -20°C/-80°C. The shelf life of lyophilized form is 12 months at -20°C/-80°C.
Lead Time
3-7 business days
Notes
Repeated freezing and thawing is not recommended. Store working aliquots at 4°C for up to one week.
Datasheet & COA
Please contact us to get it.
Description

The expression of the recombinant Human papillomavirus type 16 Protein E4 involves the construction of a plasmid encoding the Human papillomavirus type 16 Protein E4 (1-92aa). This resulting plasmid is introduced into e.coli cells. Positive e.coli cells are selected and cultured for the protein expression. The protein is fused with a N-terminal 10xHis tag and C-terminal Myc tag. After that, cultured cells are lysed. The subsequent step includes purifying the recombinant Human papillomavirus type 16 Protein E4 through affinity purification from the cell lysate and assessing the purity of the protein via SDS-PAGE. The purity of the recombinant Protein E4 is greater than 85%.

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Target Background

Function
Contributes to multiple aspects of the viral life cycle including viral genome amplification, suppression of suprabasal cell differentiation and egress of newly formed virions. Induces host cell cycle arrest at the G2 phase by associating with and preventing the nuclear entry of host CDK1/cyclin B1 complexes. Inhibits cellular DNA replication by preventing loading of host replication licensing proteins MCM2 and MCM7 onto chromatin. Within the cytoplasm, associates with host kinase SRPK1, a splicing factor regulator, and inhibits its activity. Therefore, E4 favors expression of late viral transcripts by inhibiting SRPK1-mediated phosphorylation of host serine-arginine (SR) proteins that have critical roles in mRNA metabolism. Late in the infectious cycle, E4 also acts to diminish the integrity of the keratinocyte by disrupting the keratin cytoskeleton and inducing apoptosis through alteration of mitochondrial function to facilitate egress of the newly formed virions.
Gene References into Functions
  1. These results suggest that 16E4-mediated enhancement of genome amplification involves its cell cycle inhibition and cellular kinase activation functions, with E4 modifying the activity and function of viral replication proteins including E1 PMID: 28306742
  2. Expression of the HPV16 E4 and E5 proteins results in a substantial change in the composition of the cell membrane and extracellular space, associated with alterations in cell adhesion and differentiation. PMID: 24898764
  3. 20 cervical cyology samples with HPV16 were tested by RT-PCR for HPV16 E4 mRNA, found in sqaumous intraepithelial lesion and squamous carcinoma, but not in samples negative for intrepithelial lesion. E4 expression assay may be useful in cancer diagnosis. PMID: 22299437
  4. The data suggest a model in which the expression of 16E5 from the major E1--E4-E5 mRNA promotes T57 phosphorylation of E1--E4 by ERK and keratin binding. PMID: 19211765
  5. identified the N-terminus of E2 as the first example of a viral protein that directly binds the E1--E4 protein PMID: 19783272

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Subcellular Location
Host cytoplasm. Host nucleus.
Protein Families
Papillomaviridae E4 protein family
Database Links

KEGG: vg:1489076

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