ab Complex I Enzyme Activity Microplate Assay Kit (Colorimetric)

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1 ab Complex I Enzyme Activity Microplate Assay Kit (Colorimetric) Instructions for use: For the analysis of Complex I enzyme activity from human, rat, mouse and bovine mitochondria, cell and tissue extracts. This product is for research use only and is not intended for diagnostic use. Version 10 Last Updated 20 November 2017

2 Table of Contents INTRODUCTION 1 1. BACKGROUND 1 2. ASSAY SUMMARY 2 GENERAL INFORMATION 3 3. PRECAUTIONS 3 4. STORAGE AND STABILITY 3 5. LIMITATIONS 4 6. MATERIALS SUPPLIED 4 7. MATERIALS REQUIRED, NOT SUPPLIED 5 8. TECHNICAL HINTS 6 ASSAY PREPARATION 7 9. REAGENT PREPARATION SAMPLE PREPARATION 8 ASSAY PROCEDURE ASSAY PROCEDURE 11 DATA ANALYSIS CALCULATIONS TYPICAL DATA 15 RESOURCES QUICK ASSAY PROCEDURE TROUBLESHOOTING INTERFERENCES FAQS 20

3 INTRODUCTION INTRODUCTION 1. BACKGROUND Abcam s Complex I Enzyme Activity Microplate Assay Kit (ab109721) is designed for the analysis of mitochondrial OXPHOS Complex I (NADH dehydrogenase) enzyme activity from human, rat, mouse and bovine cell and tissue extracts. This kit recognizes Complex I in human, rat, mouse and bovine cell and tissue extracts. Capture antibodies specific for Complex I are pre-coated in the microplate wells. Samples are added to the pre-coated microplate wells. After the target has been immobilized in the well, Complex I activity is determined by following the oxidation of NADH to NAD+ and the simultaneous reduction of the provided dye ( = 25.9/mM/well) which leads to increased absorbance at OD 450 nm. An accurate measurement of the enzyme s functional state is achieved by analyzing the enzyme's activity in an isolated context, outside of the cell and free from any other variables. Please note that this activity assay measures the NADH-dependent activity of Complex I. This activity is not dependent on the presence of ubiquinone and therefore inhibitors, such as rotenone, which bind at or near the ubiquinone binding site do not inhibit this assay. However, assembly deficiencies of Complex I can affect this activity assay. OXPHOS Complex I (NADH dehydrogenase, E.C ) activity is controlled by enzyme amount and by post-translational phosphorylation at key specific regulatory residues. Cellular metabolism governs these two factors. Ultimately, the cell type and growth conditions will affect Complex I activity measurements. ab Complex I Enzyme Activity Assay Kit 1

4 INTRODUCTION 2. ASSAY SUMMARY Sample preparation (5.5 mg/ml) Load sample(s) on plate Incubate for 3 hours at RT. Wash plate wells with Buffer 3X Add 200 µl of Assay Solution to each well Measure Optical Density (OD450 nm) in a kinetic mode at RT for 30 minutes* *For kinetic mode detection, incubation time given in this summary is for guidance only. ab Complex I Enzyme Activity Assay Kit 2

5 GENERAL INFORMATION GENERAL INFORMATION 3. PRECAUTIONS Please read these instructions carefully prior to beginning the assay. All kit components have been formulated and quality control tested to function successfully as a kit. We understand that, occasionally, experimental protocols might need to be modified to meet unique experimental circumstances. However, we cannot guarantee the performance of the product outside the conditions detailed in this protocol booklet. Reagents should be treated as possible mutagens and should be handle with care and disposed of properly. Please review the Safety Datasheet (SDS) provided with the product for information on the specific components. Observe good laboratory practices. Gloves, lab coat, and protective eyewear should always be worn. Never pipet by mouth. Do not eat, drink or smoke in the laboratory areas. All biological materials should be treated as potentially hazardous and handled as such. They should be disposed of in accordance with established safety procedures. 4. STORAGE AND STABILITY Store kit at +4ºC in the dark immediately upon receipt. Kit has a storage time of 1 year from receipt, providing components have not been reconstituted. Refer to list of materials supplied for storage conditions of individual components. Observe the storage conditions for individual prepared components in the Materials Supplied section. Aliquot components in working volumes before storing at the recommended temperature. ab Complex I Enzyme Activity Assay Kit 3

6 GENERAL INFORMATION 5. LIMITATIONS Assay kit intended for research use only. Not for use in diagnostic procedures. Do not mix or substitute reagents or materials from other kit lots or vendors. Kits are QC tested as a set of components and performance cannot be guaranteed if utilized separately or substituted. 6. MATERIALS SUPPLIED Item Amount Storage Condition (Before Preparation) Storage Condition (After Preparation) 20X Wash Buffer 25 ml 4 C 4 C 10X Blocking Buffer 10 ml 4 C 4 C 10X Detergent 1 ml 4 C 4 C 20X NADH (40 mm after 1 vial 4 C -80 C addition of H 2 O) 100X Dye (lyophilized) 1 vial 4 C -80 C 96-well microplate (12 x 8 well strips) 1 4 C 4 C ab Complex I Enzyme Activity Assay Kit 4

7 GENERAL INFORMATION 7. MATERIALS REQUIRED, NOT SUPPLIED These materials are not included in the kit, but will be required to successfully perform this assay: Microplate reader capable of measuring absorbance at OD 450 nm. Ultra-pure water or double distilled water (ddh 2 O) Pipettes and pipette tips, including multi-channel pipette Assorted glassware for the preparation of reagents and buffer solutions Tubes for the preparation of reagents and buffer solutions Dounce homogenizer (if using tissue) Method for determining protein concentration: we recommend BCA Protein Quantification Kit (ab102536) For mitochondria isolation: Mitochondria Isolation Kit for Cultured Cells (ab110170) Mitochondria Isolation Kit for Tissue (ab110168) or Mitochondria Isolation Kit for Tissue (with Dounce Homogenizer) (ab110169) ab Complex I Enzyme Activity Assay Kit 5

8 GENERAL INFORMATION 8. TECHNICAL HINTS This kit is sold based on number of tests. A test simply refers to a single assay well. The number of wells that contain sample, control or standard will vary by product. Review the protocol completely to confirm this kit meets your requirements. Please contact our Technical Support staff with any questions. Selected components in this kit are supplied in surplus amount to account for additional dilutions, evaporation, or instrumentation settings where higher volumes are required. They should be disposed of in accordance with established safety procedures. Avoid foaming or bubbles when mixing or reconstituting components. Avoid cross contamination of samples or reagents by changing tips between sample, standard and reagent additions. Ensure all reagents and solutions are at the appropriate temperature before starting the assay. Samples which generate values that are greater than the most concentrated standard should be further diluted in the appropriate sample dilution buffer. Ensure plates are properly sealed or covered during incubation steps. Make sure you have the right type of plate for your detection method of choice. Make sure all necessary equipment is switched on and set at the appropriate temperature. ab Complex I Enzyme Activity Assay Kit 6

9 ASSAY PREPARATION ASSAY PREPARATION 9. REAGENT PREPARATION Briefly centrifuge small vials at low speed prior to opening X Wash Buffer: Prepare 1X Buffer by diluting 20X Buffer in ddh 2 O: to make 500 ml 1X Buffer, combine 25 ml 20X Buffer with 475 ml ddh 2 O. Mix thoroughly and gently. Label this mixture as Buffer. Store Buffer at 4 C. Equilibrate to room temperature before use X Blocking Solution: Dilute 10X Blocking Solution in Buffer to create Incubation Solution: to make 100 ml Incubation Buffer, combine 10 ml of 10X Blocking Solution with 90 ml of Buffer. Mix thoroughly and gently. Label this mixture as Incubation Solution. Store Incubation Solution at 4 C. Equilibrate to room temperature before use X Detergent: Ready to use as supplied. Equilibrate to room temperature before use. Store at 4 C X NADH: Reconstitute the lyophilized NADH in 1.1 ml of ddh 2 O and mix thoroughly until dissolved to make a 40 mm solution. Aliquot reconstituted NADH so that you have enough volume to perform the desired number of assays. Store at -80 C. Reconstituted NADH is stable for up to 6 months. Keep on ice while in use X Dye: Reconstitute the dye in 250 µl of ddh 2 O and mix thoroughly until dissolved. Aliquot reconstituted Dye so that you have enough volume to perform the desired number of assays. Reconstituted Dye is stable for up to 6 months. Store at -80 C. Keep on ice while in use well microplate (12 x 8-well strips): ab Complex I Enzyme Activity Assay Kit 7

10 ASSAY PREPARATION Ready to use as supplied. This plate can be broken into 12 separate 8-well strips for convenience. Equilibrate to room temperature before use. Store at 4 C. ab Complex I Enzyme Activity Assay Kit 8

11 ASSAY PREPARATION 10.SAMPLE PREPARATION General Sample Information We recommend performing several dilutions of your sample to ensure the readings are within the standard value range. We recommend that you use fresh samples. If you cannot perform the assay at the same time, we suggest that you complete the Sample Preparation step before storing the samples. Alternatively, if that is not possible, we suggest that you snap freeze samples in liquid nitrogen upon extraction and store the samples immediately at -80 C. When you are ready to test your samples, thaw them on ice. Be aware however that this might affect the stability of your samples and the readings can be lower than expected. Treat cells with Complex I activators / inhibitors as per your experimental requirements Preparation of extracts from cells (adherent or suspension): Harvest suspension cells by centrifugation or scrape to collect adherent cells from a confluent culture flask (initial recommendation = 1 2 x 10 7 cells) Wash cells twice with PBS Resuspend and dilute the cell pellet with 9 volumes of PBS (e.g. 50 µl pellet µl PBS to a total volume of 500 µl) Optional: Determine the sample protein concentration (using a standard method such as BCA), by extracting a portion of your sample. Adjust concentration of the sample with PBS so that the final sample protein concentration is 5.5 mg/ml Extract the proteins from the sample by adding 10X Detergent solution to sample to a final dilution of 1/10 (e.g. if the total sample volume is 500 µl add 50 µl of 10X Detergent solution). Mix well by inversion. Please note the sample concentration is now 5 mg/ml Incubate the tube on ice for 30 minutes to allow solubilization. ab Complex I Enzyme Activity Assay Kit 9

12 ASSAY PREPARATION Centrifuge the sample for 20 minutes at 4 C at 12,000 16,000 x g in a cold centrifuge Collect supernatant and transfer to a clean tube Based on the protein concentration of sample extracted (10.1.5; 5 mg/ml) dilute your samples to the desired concentration in Incubation Solution (from step 9.2). Table 1 indicates a typical linear range for the assay Preparation of extracts from tissue: Harvest tissue for the assay (initial recommendation = mg) Wash tissue thoroughly in cold PBS to remove blood Resuspend tissue in 500 µl 1 ml of ice cold PBS Homogenize tissue with a Dounce homogenizer sitting on ice, with passes, or until sample is fully homogenized and is completely smooth Collect homogenate and transfer to a clean tube Determine the sample protein concentration (using a standard method such as BCA) by extracting a portion of your sample. Adjust concentration of the sample with PBS so that the final sample protein concentration is 5.5 mg/ml Extract the proteins from the sample by adding 10X Detergent solution to sample to a final dilution of 1/10 (e.g. if the total sample volume is 500 µl add 50 µl of 10X Detergent solution). Mix well Incubate the tube on ice for 30 minutes to allow solubilization Centrifuge the sample for 20 minutes at 4 C at 12,000 16,000 x g in a cold centrifuge Collect supernatant and transfer to a clean tube. Please note the sample concentration now is 5 mg/ml. ab Complex I Enzyme Activity Assay Kit 10

13 ASSAY PREPARATION Dilute your samples to the desired concentration in Incubation Solution (from step 9.2). Table 1 indicates a typical linear range for the assay. Sample Type Recommended Concentration (µg/200 µl volume) Cell culture extracts Fibroblast (MRC5) cell extracts 100 Heptoblastoma (HepG2) cell extracts 200 Tissue extracts (mitochondria) Heart extracts 20 Liver extracts 50 Table 1. Typical ranges of measurement per 200 µl well volume based on extraction of sample at 5 mg/ml Preparation of isolated mitochondria: You can isolate mitochondria using mitochondrial isolation kits such Mitochondria Isolation Kit for Cultured Cells (ab110170) or Mitochondria Isolation Kit for Tissue (with Dounce Homogenizer) (ab110169). Alternatively, mitochondria can be prepared by standard mitochondria isolation method of differential centrifugation of homogenized tissue and cell samples. ab Complex I Enzyme Activity Assay Kit 11

14 ASSAY PROCEDURE ASSAY PROCEDURE 11.ASSAY PROCEDURE Equilibrate all materials and prepared reagents to correct temperature prior to use. We recommend that you include a positive control sample (untreated samples or sample of known robust Complex I activity see FAQ section) in addition to a buffer only control and to assay all samples/controls in duplicate. Prepare all reagents, working standards, and samples as directed in the previous sections Plate Loading: - Sample wells - add 200 µl of sample prepared as described in the Sample Preparation section to each well of the microplate that will be used for this experiment. - Background/Buffer only control wells - add 200 µl 1X Incubation buffer to buffer only wells. - Positive control sample wells - add 200 µl of positive sample to appropriate wells Incubate microplate for 3 hours at room temperature Measurement: Empty the wells by turning the plate over and shaking out any remaining liquid. Blot the plate face down on paper towel Add 300 µl of 1X Buffer solution to each well used Empty the wells of the microplate by turning the plate over and shaking out any remaining liquid. Blot the plate face down on paper towel Add 300 µl of 1X Buffer solution to each well used Prepare Assay Solution: Prepare 1.75 ml/strip of Assay Solution according to the following table: ab Complex I Enzyme Activity Assay Kit 12

15 ASSAY PROCEDURE Number of strips 1X Buffer (ml) 20X NADH (µl) 100X Dye (µl) Total volume (ml) Empty the wells of 1X Buffer as described in step Add 200 µl of Assay Solution (from step ) to each well carefully to avoid bubbles. Any bubbles should be popped with a fine needle as rapidly as possible Place the plate in the reader and record with the following kinetic program. Mode Wavelength: Time: Interval: Shaking: Temperature Kinetic 450 nm 30 minutes 20 sec - 1 min Shake between readings Room temperature NOTE: Sample incubation time can vary depending on enzyme activity in the samples Save data and analyze as described in the Data Analysis section. ab Complex I Enzyme Activity Assay Kit 13

16 DATA ANALYSIS DATA ANALYSIS 12.CALCULATIONS Extinction coefficient for dye () = 25.9/mM/well Final concentration of NADH is 2 mm. Complex I activity in each well is proportional to the increase in absorbance at OD 450 nm within each well. The activity is expressed as the change in absorbance per minute per amount of sample loaded into the well. If the sample background control is significant, then subtract the sample background control from the sample reading. Examine the linear rate of increase in absorbance at OD 450 nm over time. An example is shown below where the rate/slope is calculated between these time points. Most microplate software of performing this function. Repeat this for all samples. Figure 1: Raw data: change in OD 450 nm observed in cultured HepG2 cell lysate. ab Complex I Enzyme Activity Assay Kit 14

17 DATA ANALYSIS Raw data (as seen in Figure 1) can be expressed as rate (mod/min) per µg of cell lysate added per well as shown below in Figure 2. Figure 2: Complex I activity measured in cultured HepG2 cell lysate. TYPICAL SAMPLE VALUES PRECISION Intra Assay Inter Assay n= CV (%) <10 <15 ab Complex I Enzyme Activity Assay Kit 15

18 DATA ANALYSIS 13. TYPICAL DATA Data provided for demonstration purposes only. Figure 3: Complex I activity measured in normal and Rho0 human fibroblasts. Rho0 cells are cells in which the mitochondrial DNA has been removed and therefore essential Complex I proteins are not expressed. As shown in the right column, the rho0 cells showed no/little complex I activity. Figure 4: Complex I activity measured in rat cardiomyocytes grown for 5 days in absence or presence of 40 µm chloramphenicol (CAM) to inhibit mitochondrial protein synthesis. In this case, both Complex I assembly and activity will be greatly reduced. ab Complex I Enzyme Activity Assay Kit 16

19 DATA ANALYSIS Figure 5: ab measures Complex I activity in human, mouse and rat cultured cells but also in tissues/tissue mitochondria samples within the recommended ranges given in the protocol. Note that these ranges depend on mitochondria preparation quality. Examples of Complex I activity measured in different rat and mouse mitochondrial samples are shown in the graphs above. ab Complex I Enzyme Activity Assay Kit 17

20 RESOURCES RESOURCES 14. QUICK ASSAY PROCEDURE NOTE: This procedure is provided as a quick reference for experienced users. Follow the detailed procedure when performing the assay for the first time Prepare Sample (approximately 1 hour) Adjust sample concentration to 5.5 mg/ml in PBS. Perform Detergent extraction with 1/10 volume 10X Detergent. Incubate on ice for 30 minutes. Centrifuge at 12,000 x g for 20 minutes at 4 C and then collect supernatant Load Plate (3 hours) Load sample(s) on plate being sure to include a normal sample and a buffer control as null reference. Incubate 3 hours at room temperature Measure (1 hour) Prepare sufficient Assay Solution. Rinse wells three times with Buffer. Add 200 µl of Assay Solution to each well. Measure OD 450nm at approximately 20 sec - 1 minute intervals for 30 minutes. ab Complex I Enzyme Activity Assay Kit 18

21 RESOURCES 15.TROUBLESHOOTING Problem Cause Solution Assay not working Use of ice-cold buffer Plate read at incorrect wavelength Buffers must be at room temperature Check the wavelength and filter settings of instrument Sample with erratic readings or no signal Lower/ Higher readings in samples and Standards Standard readings do not follow a linear pattern Use of a different 96- well plate Samples not efficiently extracted with detergent Cells/tissue samples not homogenized completely Samples used after multiple free/ thaw cycles Use of old or inappropriately stored samples Presence of interfering substance in the sample Improperly thawed components Allowing reagents to sit for extended times on ice Incorrect incubation times or temperatures Pipetting errors in standard or reaction mix Air bubbles formed in well Standard stock is at incorrect concentration Colorimetric: Clear plates Fluorometric: black wells/clear bottom plate Ensure sufficient protein and adequate detergent to protein ratio as detailed in Section 10. Use Dounce homogenizer, increase number of strokes Aliquot and freeze samples if needed to use multiple times Use fresh samples or store at - 80 C (after snap freeze in liquid nitrogen) till use Check protocol for interfering substances; deproteinize samples Thaw all components completely and mix gently before use Always thaw and prepare fresh reaction mix before use Verify correct incubation times and temperatures in protocol Avoid pipetting small volumes (< 5 µl) and prepare a master mix whenever possible Pipette gently against the wall of the tubes Always refer to dilutions on protocol ab Complex I Enzyme Activity Assay Kit 19

22 RESOURCES Problem Cause Solution Unanticipated results Measured at incorrect wavelength Check equipment and filter setting Samples contain interfering substances Sample readings above/ below the linear range Troubleshoot if it interferes with the kit Concentrate/ Dilute sample so it is within the linear range ab Complex I Enzyme Activity Assay Kit 20

23 RESOURCES 16.INTERFERENCES These chemicals or biological materials will cause interferences in this assay causing compromised results or complete failure: RIPA buffer and other buffers that contain ionic-detergents such as SDS can affect the assembly of the enzyme or decrease the activity of the enzyme. 17.FAQs How do I prepare my mitochondria samples? Tissue and cell culture extracts are suitable with this kit with some optimization of load and detergent extraction conditions. We have found that little or no optimization is necessary if crude mitochondria are used. Mitochondria can be prepared by simple differential centrifugation of homogenized samples. How do I grow and prepare my cells? Complex I activity in cells from different origins differs greatly. Nontransformed fibroblasts have a higher activity than transformed cell lines such as HepG2 or HeLa cells. Consequently cell type and growth conditions are a large factor in Complex I activity measurement. Approximately how much protein is yielded from my plate of cells? We find the following typical yield of cells from a single confluent 177 cm 2 plate: Human fibroblasts: 1x10 7 cells mg total protein. Human HepG2: 2x10 7 cells - 3 mg total protein. It is recommended that you accurately determine the number of cells from your culture and the total protein yield. ab Complex I Enzyme Activity Assay Kit 21

24 RESOURCES Can you recommend any positive controls? Any of the lysates mentioned below can be used as positive control in this assay: ab Bovine Heart Mitochondrial lysate ab Rat Liver Mitochondrial lysate ab Rat Heart Mitochondrial lysate ab Rat Brain Mitochondrial lysate ab Mouse Liver Mitochondrial lysate ab Mouse Heart Mitochondrial lysate ab Mouse Brain Mitochondrial lysate ab Complex I Enzyme Activity Assay Kit 22

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