Mouse CDK9 (Cyclin Dependent Kinase 9) ELISA Kit (MOES00934)

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ELISA Kit Technical ManualMSDS

Mouse CDK9 (Cyclin Dependent Kinase 9) ELISA Kit

This ELISA kit uses Sandwich-ELISA as the method. The micro ELISA plate provided in this kit has been pre-coated with an antibody specific to Mouse CDK9 . Standards or samples are added to the appropriate micro ELISA plate wells and combined with the specific antibody. Then a biotinylated detection antibody specific for Mouse CDK9 and Avidin-Horseradish Peroxidase (HRP) conjugate are added to each micro plate well successively and incubated. Free components are washed away. The substrate solution is added to each well. Only those wells that contain Mouse CDK9, biotinylated detection antibody and Avidin-HRP conjugate will appear blue in color. The enzyme-substrate reaction is terminated by adding Stop Solution and the color turns yellow. The optical density (OD) is measured spectrophotometrically at a wavelength of 450 nm ± 2 nm. The OD value is proportional to the concentration of Mouse CDK9. The concentration of Mouse CDK9 in samples can be calculated by comparing the OD of the samples to the standard curve.

Assay typeSandwich
Assay time4.5h
Detection MethodColormetric
Detection Range3.13-200 ng/mL
Sensitivity1.88 ng/mL
Sample Volume Required Per Well100uL
Sample TypeSerum, plasma and other biological fluids


This kit recognizes Mouse CDK9 in samples. No significant cross-reactivity or interference between Mouse CDK9 and analogues was observed.

Typical Data

As the OD values of the standard curve may vary according to the conditions of the actual assay performance (e.g. operator, pipetting technique, washing technique or temperature effects), the operator should establish a standard curve for each test. Typical standard curve and data is provided below for reference only.

O.D Average Corrected


Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level Mouse CDK9 were tested 20 times on one plate, respectively.

Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level Mouse CDK9 were tested on 3 different plates, 20 replicates in each plate.

Intra-assay Precision Inter-assay Precision
Mean (ng/mL)10.8427.2989.6510.8426.2489.39
Standard deviation0.591.524.840.751.322.74
C V (%)5.445.575.406.925.033.07


The recovery of Mouse CDK9 spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.

Sample Type Range (%) Average Recovery (%)
Serum (n=5)93-10798
EDTA plasma (n=5)93-10599
Cell culture media (n=5)91-10597


Samples were spiked with high concentrations of Mouse CDK9 and diluted with Reference Standard & Sample Diluent to produce samples with values within the range of the assay.

Serum (n=5) EDTA plasma (n=5) Cell culture media (n=5)
1:2Range (%)90-10286-9994-107
Average (%)9592100
1:4Range (%)92-10484-9789-102
Average (%)988995
1:8Range (%)88-9984-9483-96
Average (%)948989
1:16Range (%)90-10584-9484-98
Average (%)988991

Kit Components & Storage

An unopened kit can be stored at 4'C for 1 month. If the kit is not used within 1 month, store the items separately according to the following conditions once the kit is received.

Item Specifications Storage
Micro ELISA Plate(Dismountable)8 wells X12 strips-20'C, 6 months
Reference Standard2 vials
Concentrated Biotinylated Detection Ab (100X)1 vial, 120 uL
Concentrated HRP Conjugate (100X)1 vial, 120 uL-20'C(shading light), 6 months
Reference Standard & Sample Diluent1 vial, 20 mL4'C, 6 months
Biotinylated Detection Ab Diluent1 vial, 14 mL
HRP Conjugate Diluent1 vial, 14 mL
Concentrated Wash Buffer (25X)1 vial, 30 mL
Substrate Reagent1 vial, 10 mL4'C(shading light)
Stop Solution1 vial, 10 mL4'C
Plate Sealer5 pieces
Product Description1 copy
Certificate of Analysis1 copy

Mouse CDK9 (Cyclin Dependent Kinase 9) ELISA Kit (MOES00934) Assay procedure

    1. Set standard, test sample and control (zero) wells on the pre-coated plate and record theirpositions. It is recommended to measure each standard and sample in duplicate. Note: addall solutions to the bottom of the plate wells while avoiding contact with the well walls. Ensuresolutions do not foam when adding to the wells.
    2. Aliquot 100µl of standard solutions into the standard wells.
    3. Add 100µl of Sample / Standard dilution buffer into the control (zero) well.
    4. Add 100µl of properly diluted sample (serum, plasma, tissue homogenates and otherbiological fluids) into test sample wells.
    5. Cover the plate with the sealer provided in the kit and incubate for 90 min at 37°C.
    6. Aspirate the liquid from each well, do not wash. Immediately add 100µL of BiotinylatedDetection Ab working solution to each well. Cover the plate with a plate seal and gently mix.Incubate for 1 hour at 37°C.
    7. Aspirate or decant the solution from the plate and add 350µL of wash buffer to each welland incubate for 1-2 minutes at room temperature. Aspirate the solution from each well andclap the plate on absorbent filter paper to dry. Repeat this process 3 times. Note: a microplatewasher can be used in this step and other wash steps.
    8. Add 100µL of HRP Conjugate working solution to each well. Cover with a plate seal andincubate for 30 min at 37°C.
    9. Aspirate or decant the solution from each well. Repeat the wash process for five times asconducted in step 7.
    10. Add 90µL of Substrate Reagent to each well. Cover with a new plate seal and incubate forapproximately 15 min at 37°C. Protect the plate from light. Note: the reaction time can beshortened or extended according to the actual color change, but not by more than 30min.
    11. Add 50 µL of Stop Solution to each well. Note: Adding the stop solution should be done inthe same order as the substrate solution.
    12. Determine the optical density (OD value) of each well immediately with a microplate readerset at 450 nm.

Mouse CDK9 (Cyclin Dependent Kinase 9) ELISA Kit (MOES00934) Protein Information

UniProt Protein Function:CDK9: a protein kinase of the CDK family. Forms a complex with and is regulated by its regulatory subunit cyclin T or cyclin K. A component of the multiprotein complex TAK/P-TEFb, which is an elongation factor for RNA polymerase II-directed transcription and functions by phosphorylating the C-terminal domain of the largest subunit of RNA polymerase II. Transcriptional elongation factor and cofactor for HIV Tat protein; RNAi blocks HIV replication, and inhibitors also block varicella zoster replication. Mediates signals leading to cardiac hypertrophy. Inhibitor: Flavopiridol.
UniProt Protein Details:

Protein type:Protein kinase, CMGC; Protein kinase, Ser/Thr (non-receptor); Kinase, protein; Cell cycle regulation; EC; Nuclear receptor co-regulator; EC; CMGC group; CDK family; CDK/CDK9 subfamily; CDK9 subfamily

Cellular Component: intracellular membrane-bound organelle; membrane; nucleoplasm; nucleus; PML body; transcription elongation factor complex; transcription elongation factor complex b

Molecular Function:chromatin binding; cyclin-dependent protein kinase activity; DNA binding; protein binding; RNA polymerase subunit kinase activity; snRNA binding; transcription factor binding

Biological Process: positive regulation of histone phosphorylation; positive regulation of transcription from RNA polymerase II promoter; protein amino acid phosphorylation; regulation of DNA repair; regulation of histone modification; regulation of muscle cell differentiation; replication fork processing

UniProt Code:Q99J95
NCBI GenInfo Identifier:60391905
NCBI Gene ID:107951
NCBI Accession:Q99J95.1
UniProt Secondary Accession:Q99J95,Q3U002, Q3UMY2, Q3UPT3, Q3UQI6, Q8BTN0, B0R020
UniProt Related Accession:Q99J95
Molecular Weight:28,026 Da
NCBI Full Name:Cyclin-dependent kinase 9
NCBI Synonym Full Names:cyclin-dependent kinase 9 (CDC2-related kinase)
NCBI Official Symbol:Cdk9
NCBI Official Synonym Symbols:PITALRE
NCBI Protein Information:cyclin-dependent kinase 9
UniProt Protein Name:Cyclin-dependent kinase 9
UniProt Synonym Protein Names:Cell division protein kinase 9
Protein Family:Cyclin-dependent kinase
UniProt Gene Name:Cdk9
UniProt Entry Name:CDK9_MOUSE
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