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  4. Human SARS-CoV-2 S1 RBD IgG Antibody ELISA Kit

Human SARS-CoV-2 S1 RBD IgG Antibody ELISA Kit

  • 中文名称：
    人新型冠状病毒S糖蛋白RBD(SARS-CoV-2 S1 RBD) IgG抗体酶联免疫试剂盒
  • 货号：
    CSB-EL33241HU
  • 规格：
    96T/48T
  • 价格：
    ￥3600/￥2500
  • 其他：

产品详情

  • 产品描述：

    The product CSB-EL33241HU is an easy-to-use ELISA Kit intended for the qualitative detection of SARS-CoV-2 S1 RBD IgG antibody in human serum and plasma in vitro. SARS-CoV-2 S1 RBD IgG is an indicator of a recent or prior COVID infection. Infected patients develop IgG against SARS-CoV-2 S1 RBD 7 days post-infection, and IgG content peaks in the third week (IgM was close to vanishing at this time). IgG lasts in the blood for months or even years. After secondary infection, IgG levels in the body of patients increase rapidly and substantially in the short term and remain in the body for a long time, while IgM rarely increases. Serological testing may help to diagnose suspected patients with negative RT–PCR (real-time polymerase chain reaction) results and identify asymptomatic infections.

  • 别名：
    S; 2; Spike glycoprotein; S glycoprotein; E2; Peplomer protein)
  • 缩写：
    SARS-CoV-2 S RBD Ab (IgG)
  • Uniprot No.：
  • 种属：
    Homo sapiens (Human)
  • 样本类型：
    serum, plasma
  • 检测范围：
  • 反应时间：
    1-5h
  • 样本体积：
    50-100ul
  • 检测波长：
    450 nm
  • 研究领域：
    Infectious Diseases
  • 测定原理：
    qualitative
  • 测定方法：
    Indirect
  • 精密度：
    Intra-assay Precision (Precision within an assay): CV%<15%
    Three samples of known concentration were tested twenty times on one plate to assess.
    Inter-assay Precision (Precision between assays): CV%<15%
    Three samples of known concentration were tested in twenty assays to assess.
  • 标准曲线：
    Test parameter specification test result
    Positive control ≥1.0 1.256
    Negative control ≤0.25 0.193
    Positive rate 20，Positive 100%
    Negative rate 20，Negative 100%
  • 本试剂盒所含材料：
      • A 96-well Coated assay plate 1 -- This microplate has been pre-coated with human SARS-CoV-2 S1 RBD antigen.
      • Negative Control (1 x 800 μl) -- It is free of the SARS-CoV-2 S1 RBD IgG antibody and used to preclude the false positive.
      • Positive Control (1 x 800 μl) -- Used to evaluate the validity, stability, and comparability of the test results.
      • HRP-conjugated anti-Human IgG antibody (100 x concentrate) (1 x 120 μl) -- Act as the detection antibody.
      • HRP-conjugate Diluent (1 x 20 ml) -- Dilute the HRPconjugated anti-Human IgG antibody.
      • Sample Diluent (2 x 20 ml) -- Dilute the sample solution.
      • Wash Buffer (25 x concentrate) (1 x 20 ml) -- Wash the unbound regeat.
      • TMB Substrate (1 x 10 ml) -- React with HRP, eliciting a chromogenic color reaction.
      • Stop Solution (1 x 10 ml) -- Stop the color reaction. The solution turns from blue to yellow.
      • Four Adhesive Strips (For 96 wells) -- Seal the microplate when incubation.
      • An Instruction manual

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  • 本试剂盒不含材料：
      • A microplate reader capable of measuring absorbance at 450 nm, with the correction wavelength set at 540 nm or 570 nm.
      • An incubator that can provide stable incubation conditions up to 37°C±5°C.
      • Centrifuge
      • Vortex
      • Squirt bottle, manifold dispenser, or automated microplate washer.
      • Absorbent paper for blotting the microtiter plate.
      • 50-300ul multi-channel micropipette
      • 100ml and 500ml graduated cylinders.
      • Deionized or distilled water.
      • Pipette tips
      • Timer
      • Test tubes for dilution.

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  • 货期：
    3-5 working days

产品评价

问答及客户评论

■ 常见问题解答
Q:

What is the differences between the SARS-CoV-2 S protein and N protein?

A:
Spike glycoprotein (S) is a structural protein that protrudes from the lipid envelop to form a typical bulbous, crown-like halo surrounding the viral particle. The S protein of SARS-CoV-2 functions to recognize the receptor, attach to and fuse with the host cell membrane during viral infection. Proteolysis by TMPRSS2 and cathepsin B/L exerts a vital role in priming SARS-CoV-2 S ...展开 >>
Q:

What is the assay procedure?

A:
1. Prepare all reagents and samples as instructed.
2. Refer to the Assay Layout Sheet to calculate the number of the wells (including a blank well) to be used and put the remaining wells and the desiccant back into the pouch to seal and store at 4 °C.
3. Add 100 µl positive control, negative control, or sample (may require dilution) to each well. Seal and incubate 30 minut...展开 >>

靶点详情

  • 功能：
    attaches the virion to the cell membrane by interacting with host receptor, initiating the infection. Binding to human ACE2 receptor and internalization of the virus into the endosomes of the host cell induces conformational changes in the Spike glycoprotein. Binding to host NRP1 and NRP2 via C-terminal polybasic sequence enhances virion entry into host cell. This interaction may explain virus tropism of human olfactory epithelium cells, which express high level of NRP1 and NRP2 but low level of ACE2. The stalk domain of S contains three hinges, giving the head unexpected orientational freedom. Uses human TMPRSS2 for priming in human lung cells which is an essential step for viral entry. Can be alternatively processed by host furin. Proteolysis by cathepsin CTSL may unmask the fusion peptide of S2 and activate membranes fusion within endosomes.; mediates fusion of the virion and cellular membranes by acting as a class I viral fusion protein. Under the current model, the protein has at least three conformational states: pre-fusion native state, pre-hairpin intermediate state, and post-fusion hairpin state. During viral and target cell membrane fusion, the coiled coil regions (heptad repeats) assume a trimer-of-hairpins structure, positioning the fusion peptide in close proximity to the C-terminal region of the ectodomain. The formation of this structure appears to drive apposition and subsequent fusion of viral and target cell membranes.; Acts as a viral fusion peptide which is unmasked following S2 cleavage occurring upon virus endocytosis.; May down-regulate host tetherin (BST2) by lysosomal degradation, thereby counteracting its antiviral activity.
  • 基因功能参考文献：
    1. Study presents crystal structure of C-terminal domain of SARS-CoV-2 (SARS-CoV-2-CTD) spike S protein in complex with human ACE2 (hACE2); hACE2-binding mode similar overall to that observed for SARS-CoV. However, details at the binding interface show that key residue substitutions in SARS-CoV-2-CTD slightly strengthen the interaction and lead to higher affinity for receptor binding than SARS-CoV receptor-binding domain. PMID: 32378705
    2. crystal structure of the receptor-binding domain (RBD) of the spike protein of SARS-CoV-2 bound to the cell receptor ACE2 PMID: 32365751
    3. crystal structure of the receptor-binding domain (RBD) of the spike protein of SARS-CoV-2 (engineered to facilitate crystallization) in complex with ACE2 PMID: 32320687
    4. Out of the two isolates from India compared to the isolates from Wuhan, China, one was found to harbor a mutation in its receptor-binding domain (RBD) at position 407 where, arginine was replaced by isoleucine. This mutation has been seen to change the secondary structure of the protein at that region and this can potentially alter receptor binding of the virus. PMID: 32275855
    5. Structural modeling of the SARS-CoV-2 spike glycoprotein show similar receptor utilization between SARS-CoV-2 and SARS-CoV, despite a relatively low amino acid similarity in the receptor binding module. Compared to SARS-CoV and all other coronaviruses in Betacoronavirus lineage B, an extended structural loop containing basic amino acids were identified at the interface of the receptor binding (S1) and fusion (S2) domains. PMID: 32245784
    6. crystal structure of CR3022, a neutralizing antibody from a SARS patient, in complex with the receptor-binding domain of the SARS-CoV-2 spike (S) protein to 3.1 A; study provides insight into how SARS-CoV-2 can be targeted by the humoral immune response and revealed a conserved, but cryptic epitope shared between SARS-CoV-2 and SARS-CoV PMID: 32225176
    7. SARS-CoV and SARS-CoV-2 spike proteins have comparable binding affinities achieved by balancing energetics and dynamics. The SARS-CoV-2-ACE2 complex contains a higher number of contacts, a larger interface area, and decreased interface residue fluctuations relative to the SARS-CoV-ACE2 complex. PMID: 32225175
    8. Interaction interface between cat/dog/pangolin/Chinese hamster ACE2 and SARS-CoV/SARS-CoV-2 S protein was simulated through homology modeling. s identified that N82 of ACE2 showed closer contact with receptor-binding domain of S protein than human ACE2. PMID: 32221306
    9. SARS-CoV-2 S glycoprotein harbors a furin cleavage site at the boundary between the S1/S2 subunits, which is processed during biogenesis and sets this virus apart from SARS-CoV and SARS-related CoVs; determined cryo-EM structures of the SARS-CoV-2 S ectodomain trimer. PMID: 32201080
    10. Study demonstrates that SARS-CoV-2 uses the SARS-CoV receptor ACE2 for entry and the serine protease TMPRSS2 for S protein priming. PMID: 32155444
    11. The ACE2-B0AT1 complex exists as a dimer of heterodimers. Structural alignment of the RBD-ACE2-B0AT1 ternary complex with the S protein of SARS-CoV-2 suggests that two S protein trimers can simultaneously bind to an ACE2 homodimer. PMID: 32142651
    12. study demonstrated SARS-CoV-2 S protein entry on 293/hACE2 cells is mainly mediated through endocytosis, and PIKfyve, TPC2 and cathepsin L are critical for virus entry; found that SARS-CoV-2 S protein could trigger syncytia in 293/hACE2 cells independent of exogenous protease; there was limited cross-neutralization activity between convalescent sera from SARS and COVID-19 patients PMID: 32132184
    13. study determined a 3.5-angstrom-resolution cryo-electron microscopy structure of the 2019-nCoV S trimer in the prefusion conformation; provided biophysical and structural evidence that the 2019-nCoV S protein binds angiotensin-converting enzyme 2 (ACE2) with higher affinity than does severe acute respiratory syndrome (SARS)-CoV S PMID: 32075877

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  • 亚细胞定位：
    Virion membrane; Single-pass type I membrane protein. Host endoplasmic reticulum-Golgi intermediate compartment membrane; Single-pass type I membrane protein. Host cell membrane; Single-pass type I membrane protein.
  • 蛋白家族：
    Betacoronaviruses spike protein family