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Fluorescent ratiometric supramolecular tandem assays for phosphatase and phytase enzymes
Kirk M. Atkinson ; Bradley D. Smith ; Org. Biomol. Chem.,2024,22(8):1714-1720. DOI: 10.1039/D3OB02014B
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Abstract: Ratiometric fluorescent assays have a built-in correction factor which enhances assay accuracy and reliability. We have developed fluorescent ratiometric supramolecular tandem assays for phosphatase and phytase enzymes using a mixture of three molecular components. One of the molecules is a tetra-cationic fluorescence quencher called CalixPyr which can bind and quench the polyanionic pyrene fluorophore, CMP, that emits at 430 nm. Polyphosphates can disrupt the CMP/CalixPyr complex and alter the fluorescence intensity (responsive signal). CalixPyr has no effect on the fluorescence emission of cationic pentamethine cyanine fluorophore, cCy5, which emits at 665 nm and acts as a non-responsive reference signal. The continuous ratiometric fluorescent assay for alkaline phosphatase monitored hydrolytic consumption of adenosine triphosphate (ATP). The continuous ratiometric fluorescent assay for phytase activity monitored hydrolytic consumption of phytate. With further development this latter assay may be useful for high throughput assessment of phytase activity in individual batches of fortified animal feed. It is likely that the three-molecule mixture (CMP, CalixPyr, cCy5) can become a general assay platform for other enzymes that catalyse addition/removal of phosphate groups from appropriate molecular substrates.
Purchased from AmBeed: 58-61-7
CAS No. : | 58-61-7 | MDL No. : | MFCD00005752 |
Formula : | C10H13N5O4 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | OIRDTQYFTABQOQ-KQYNXXCUSA-N |
M.W : | 267.24 | Pubchem ID : | 60961 |
Synonyms : |
Adenine riboside;D-Adenosine;NSC 627048;NSC 7652
|
Chemical Name : | (2R,3R,4S,5R)-2-(6-Amino-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol |
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
52% | With N-chloro-succinimide; acetic acid In N,N-dimethyl-formamide at 20℃; for 48 h; | Procedure 2: Adenosine (1.09g, 4.08 mmol) was suspended in DMF (50 mL) and glacial acetic acid (10 mL) was added. A solution of N-chlorosuccinimide (2 g, 15 mmol) in DMF (15 mL) was added dropwise. The reaction mixture was stirred at rt for 48 hours and the volatiles were evaporated in vacuo to give yellow gum. The crude was absorbed on silica and purified by silica gel CC (packed in 5percent MeOHICHC13, eluted with 7percent MeOHICHC13) to yield a white powder (0.65 g, 52 percent).‘H NIVIR (500 MHz, DMSO-d6) 8.16 (s, 1H, H-2), 7.55 (br s, 2H, NH2), 5.86 (d, J = 6.8 Hz, 1H, Hi’), 5.48 (d, J 6.2 Hz, iH, 2’OH), 5.45 (d, J 4.0 Hz, iH, 5’-OH), 5.23 (d, J4.6 Hz, iH, 3’OH), 5.08-5.06 (m, iH, H-2’), 4.23-4.i8 (m, iH, H3’), 4.01-3.96 (m, iH, H4’),3.72-3.65 (m, iH, H5’), 3.57-3.50 (m, iH, H5’). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
65% | With acetic acid In methanol; N,N-dimethyl-formamide | Method B to a solution of adenosine (1.09 g, 4.1 mmol) in DMF (50 mL) and AcOH (10 mL) was added N-Chlorosuccinamide (NCS, 2.0 g, 15 mmol). The reaction mixture was stirred at room temperature for 6 days. The solvents were evaporated to dryness and the residue was purified by HPLC on a C-18 reverse phase column using MeOH:AcOH:H2 O (18:1:18, v/v) to give 0.8 g (65percent) of 2, which was identical to the title compound prepared by Method A. |
A1267987[ 201996-55-6 ]
(2R,3R,4S,5R)-2-(6-Amino-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol-2-13C
Reason: Stable Isotope