Product nameComplex I Enzyme Activity Dipstick Assay Kit
See all Complex I kits
Sample typeCell culture supernatant, Cell culture extracts, Tissue
Assay typeEnzyme activity
Species reactivityReacts with: Mouse, Rat, Cow, Human
Contains 48 dipsticks and necessary components to quantify the activity of the Complex I enzyme complex in human, bovine, rat and mouse samples. The kit includes sufficient materials to generate a standard curve and evaluate several unknown samples.
In this assay the specificity of anti-Complex I monoclonal antibodies (mAbs) is combined with the well-characterized Complex I in-gel activity assay that is not rotenone sensitive. First, Complex I is immunocaptured (i.e. immuno-precipitated in active form) on the dipstick. Second, the dipstick is immersed in Complex I activity buffer solution containing NADH as a substrate and nitrotetrazolium blue (NBT) as the electron acceptor. Immunocaptured Complex I oxidizes NADH and the resulting H+ reduces NBT to form a blue-purple precipitate at the Complex I antibody line on the dipstick. The signal intensity of this precipitate corresponds to the level of Complex I enzyme activity in the sample. Combined with dipstick assay kit for measuring Complex I quantity (ab109722/MS131 for human sample; ab109875/MS133 for rodent samples), it is possible to determine the relative specific activity of immunocaptured Complex I. The signal intensity is best measured by a dipstick reader or may be analyzed by a standard imaging system.
Tested applicationsSuitable for: Functional Studiesmore details
Storage instructionsStore at +4°C. Please refer to protocols.
Components 48 tests 10X Blocking Buffer 1 x 400µl 96-well microplate 2 units Dipsticks 1 x 48 units Extraction Buffer (ab260490) 1 x 15ml NADH (lyophilized) 1 vial NBT (Lyophilized) - 10mg 1 vial Reaction Buffer 1 x 15ml Wash buffer 1 x 2ml
- NADH dehydrogenase
The Abpromise guarantee
Our Abpromise guarantee covers the use of ab109720 in the following tested applications.
The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.
Use at an assay dependent dilution.
Use at an assay dependent dilution.
An example using ab109720 to measure Complex I activity in human fibroblast samples. Developed dipsticks from a 1:2 dilution series using a positive control sample and the associated standard curve. Starting material was 30 µg of fibroblast protein extract.
An example using ab109720 to measure Complex I activity in human fibroblast samples. Based on the standard curve, 15 µg of protein extract were loaded onto a dipstick for each sample. The figure shows four developed dipsticks, a control sample (1) and three unknowns (2-4). The analysis of the signal intensity and interpolation from the standard curve showed that the unknown samples have between 14-61% of normal Complex I activity levels.
Abcam's enzyme activity assays apply a novel approach, whereby target enzymes are first immunocaptured from tissue or cell samples before subsequent functional analysis. Dipstick ELISA Kits extend this concept by utilizing the well-established lateral flow concept, wherein capture antibodies are striped onto nitrocellulose membrane and a wicking pad draws the sample through the antibody bands. All of our ELISA kits utilize highly validated monoclonal antibodies and proprietary buffers, which are able to capture even very large enzyme complexes in their fully-intact, functionally-active states.
ab109720 was used to quantify complex I activity in HCT116 cells. The kit was used as described in the manual.
Shortly: cells were scraped and lysed in extraction buffer. Cell fragments were removed bey centrifugation and protein concentration was measured by Bradford assay. Increasing amounts of protein (as shown in image) were applied to each well as standard curve. A standard flatbed scanner was used instead of a Dipstick-reader. Due to the low contrast of the resulting bands, the brightness and contrast of the image was adjusted afterwards. Developed for 45 minutes as recommended by the manual.
ab109720 has been referenced in 40 publications.
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- Santos MCFD et al. Irp2 regulates insulin production through iron-mediated Cdkal1-catalyzed tRNA modification. Nat Commun 11:296 (2020). PubMed: 31941883
- Chen B et al. Mechanisms of hearing loss and cell death in the cochlea of connexin mutant mice. Am J Physiol Cell Physiol N/A:N/A (2020). PubMed: 32755449
- Varela-Lopez A et al. Gene pathways associated with mitochondrial function, oxidative stress and telomere length are differentially expressed in the liver of rats fed lifelong on virgin olive, sunflower or fish oils. J Nutr Biochem 52:36-44 (2018). WB ; Rat . PubMed: 29144994
- Arias-Mayenco I et al. Acute O2 Sensing: Role of Coenzyme QH2/Q Ratio and Mitochondrial ROS Compartmentalization. Cell Metab 28:145-158.e4 (2018). PubMed: 29887397