Homocysteine aptamer HCy2 and preparation method thereof
A homocysteine, cystine nucleic acid technology, applied in the field of amino acid detection, can solve the problems of lack of efficient and specific identification of homocysteine, screening preparation methods have not yet been reported, etc., and achieves easy synthesis and labeling. , Beneficial to design, improving specificity and sensitivity
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[0028] Implementation 1 Preparation of aptamer HCy2 that specifically binds homocysteine
[0029] Construction of random sequence oligonucleotide library: artificially synthesize single-stranded DNA sequences with a library capacity of 1×10 5 Single-stranded DNA random sequence oligonucleotide library, the DNA sequence included in the single-stranded DNA random sequence oligonucleotide library is:
[0030] 5’-GGATCCACCAGCGTCATCAGCA-N 25~40 -AGATAGTAAGTGCAATCTGGC-3’
[0031] The DNA sequence of the single-stranded DNA random oligonucleotide library includes an intermediate random sequence N 25~60 And fixed sequence at both ends, the middle random sequence N 25~40 It is a random sequence of 30-40 bases, the fixed sequence at both ends is: 5’-GGATCCACCAGCGTCATCAGCA, 3’-CGGTCTAACGTGAATGATAGA, and the fixed sequence at both ends is the PCR amplification primer binding region
[0032] 1) Put 0.5ml (1x10 9 Microparticles) Invitrogen's micromagnetic beads with activated amino groups and 1m...
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[0040] Example 2 Detecting the binding ability of aptamer HCy2 and homocysteine by flow cytometry
[0041] 1) Synthesize a homocysteine aptamer labeled with a fluorescent group FAM at the 5'end.
[0042] 2) Use 0nml / L, 5nml / L, 10nml / L, 20nml / L, 50nml / L, 100nml / L, 200nml / L concentration gradient FAM-labeled nucleic acid aptamer to connect homocysteine (HCy) micro Magnetic beads to determine the dissociation constant (kd) of homocysteine aptamers. The above-mentioned nucleic acid aptamers of various concentrations diluted with 200 μL of binding buffer were added with 150 nmol / L homocysteine-linked micromagnetic beads, and incubated at 37°C for 30 minutes. After washing the magnetic beads with binding buffer, resuspend them in 250 μL of binding buffer. Set random sequence oligonucleotide fragments and cysteine (Cy)-linked micromagnetic beads as controls.
[0043] 3) Use BD's flow cytometer to measure the fluorescence of the beads, and then use the Sigma plot software to plo...
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