This study outlines a method for detecting specific cyanobacterial strains using an antibody microarray chip. The process involves treating environmental samples with antibodies to identify and quantify various cyanobacterial interactions.
Begin with an antibody microarray chip printed with specific antibodies.
Each spot contains a unique antibody against a specific cyanobacterial strain.
Treat the chip with a blocking buffer to minimize non-specific interactions.
Assemble the chip in a hybridization cassette possessing multiple wells.
Introduce an environmental sample into the wells and incubate it under optimized conditions.
The sample contains various bacteria, including different cyanobacterial strains, that interact with specific antibodies on the printed chip. Wash the chip to remove the unbound bacteria.
Add an antibody mixture containing fluorophore-labeled anti-cyanobacterial-strain antibodies interacting with specific antigens on the respective cyanobacterial cells. Remove unbound antibodies.
Disassemble the cassette, wash and dry the chip, then scan it.
Fluorescence in specific spots signifies the presence of particular cyanobacterial strains in the sample.
Set up the slide in a 3-by-8 well microarray hybridization cassette following the provider's instructions. Alternatively, after modifying the antibody-printing pattern, set up a custom-made cassette, such as the one shown here, or simply use cover slides for the setup.
Following slide and cassette assembly, pipette up to 50 microliters of each sample extract or dilution of it in extraction incubation buffer into each well of the cassette. Alternatively, load samples into other incubation devices or simply use cover slides.
As a blank control, pipette 50 microliters of TBST-RR buffer into at least two separate wells of the cassette. Incubate the samples at ambient temperature for 1 hour and mix by pipetting every 15 minutes, or incubate at 4 degrees Celsius for 12 hours.
To wash the microarrays, place the cassette down, and carefully tap it onto clean absorbent paper. Then, wash the wells by adding 150 microliters of extraction incubation buffer to each one, and remove the buffer by tapping on absorbent paper as before. Repeat the wash three more times.
To each well, add 50 microliters of the fluorescent antibody mixture that contains the 17 anti-cyanobacterial strain antibodies. Incubate the samples at ambient temperature for 1 hour or at 4 degrees Celsius for 12 hours.
To wash the microarrays, carefully place the cassette down, and gently tap it onto clean absorbent paper. Then, add 150 microliters of extraction incubation buffer before removing it by tapping onto a paper towel. Repeat the wash three times. Then, disassemble the cassette and immerse the slide in 0.1x PBS solution for a quick rinse. Quickly centrifuge as before to dry the slide.
Using a fluorescence scanner, scan the slide for fluorescence at the maximum emission peak for far-red fluorescent dye. Take several images of the microarrays at different scanning parameters by changing the gain value.
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