|Detection Range:||0.16-10 ng/mL|
|Sample Volume Required Per Well:||100µL|
|Sample Type:||Serum, plasma and other biological fluids|
|Specificity:||This kit recognizes Human ARSA in samples. No significant cross-reactivity or interference between Human ARSA and analogues was observed.|
This ELISA kit uses Sandwich-ELISA as the method. The micro ELISA plate provided in this kit has been pre-coated with an antibody specific to Human ARSA. Standards or samples are added to the appropriate micro ELISA plate wells and combined with the specific antibody. Then a biotinylated detection antibody specific for Human ARSA and Avidin-Horseradish Peroxidase (HRP) conjugate are added to each micro plate well successively and incubated. Free components are washed away. The substrate solution is added to each well. Only those wells that contain Human ARSA, biotinylated detection antibody and Avidin-HRP conjugate will appear blue in color. The enzyme-substrate reaction is terminated by adding Stop Solution and the color turns yellow. The optical density (OD) is measured spectrophotometrically at a wavelength of 450 nm ± 2 nm. The OD value is proportional to the concentration of Human ARSA. The concentration of Human ARSA in samples can be calculated by comparing the OD of the samples to the standard curve.
|UniProt Protein Function:||ARSA: Hydrolyzes cerebroside sulfate. Defects in ARSA are a cause of leukodystrophy metachromatic (MLD). MLD is a disease due to a lysosomal storage defect. It is characterized by intralysosomal storage of cerebroside-3-sulfate in neural and non-neural tissues, with a diffuse loss of myelin in the central nervous system. Progressive demyelination causes a variety of neurological symptoms, including gait disturbances, ataxias, optical atrophy, dementia, seizures, and spastic tetraparesis. Three forms of the disease can be distinguished according to the age at onset: late- infantile, juvenile and adult. Arylsulfatase A activity is defective in multiple sulfatase deficiency (MSD). A clinically and biochemically heterogeneous disorder caused by the simultaneous impairment of all sulfatases, due to defective post-translational modification and activation. It combines features of individual sulfatase deficiencies such as metachromatic leukodystrophy, mucopolysaccharidosis, chondrodysplasia punctata, hydrocephalus, ichthyosis, neurologic deterioration and developmental delay. Arylsulfatase A activity is impaired in multiple sulfatase deficiency due to mutations in SUMF1. SUMF1 mutations result in defective post-translational modification of ARSA at residue Cys- 69 that is not converted to 3-oxoalanine. Belongs to the sulfatase family.|
|UniProt Protein Details:|
Protein type:Hydrolase; Lipid Metabolism - sphingolipid; EC 3. 1. 6. 8
Chromosomal Location of Human Ortholog: 22q13. 33
Cellular Component: extracellular space; lysosomal lumen; extrinsic to external side of plasma membrane; lysosome; endoplasmic reticulum lumen; acrosome; integral to membrane; endosome
Molecular Function:arylsulfatase activity; sulfuric ester hydrolase activity; calcium ion binding; cerebroside-sulfatase activity
Biological Process: sphingolipid metabolic process; response to ethanol; central nervous system development; cellular protein metabolic process; binding of sperm to zona pellucida; response to estrogen stimulus; response to methylmercury; autophagy; glycosphingolipid metabolic process; post-translational protein modification; response to nutrient; response to pH
Disease: Metachromatic Leukodystrophy
|NCBI Summary:||The protein encoded by this gene hydrolyzes cerebroside sulfate to cerebroside and sulfate. Defects in this gene lead to metachromatic leucodystrophy (MLD), a progressive demyelination disease which results in a variety of neurological symptoms and ultimately death. Alternatively spliced transcript variants have been described for this gene. [provided by RefSeq, Dec 2010]|
|NCBI GenInfo Identifier:||114221|
|NCBI Gene ID:||410|
|NCBI Accession:||P15289. 3|
|UniProt Secondary Accession:||P15289,Q6ICI5, Q96CJ0, B2RCA6, B7XD04, F8WCC8,|
|UniProt Related Accession:||P15289|
|NCBI Full Name:||Arylsulfatase A|
|NCBI Synonym Full Names:||arylsulfatase A|
|NCBI Official Symbol:||ARSA|
|NCBI Official Synonym Symbols:||MLD|
|NCBI Protein Information:||arylsulfatase A; ASA; cerebroside-sulfatase|
|UniProt Protein Name:||Arylsulfatase A|
|UniProt Synonym Protein Names:||Cerebroside-sulfataseCleaved into the following 2 chains:Arylsulfatase A component B; Arylsulfatase A component C|
|UniProt Gene Name:||ARSA|
|UniProt Entry Name:||ARSA_HUMAN|
As the OD values of the standard curve may vary according to the conditions of the actual assay performance (e. g. operator, pipetting technique, washing technique or temperature effects), the operator should establish a standard curve for each test. Typical standard curve and data is provided below for reference only.
Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level Human ARSA were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level Human ARSA were tested on 3 different plates, 20 replicates in each plate.
|Intra-assay Precision||Inter-assay Precision|
|C V (%)||5.88||5.76||5.18||5.56||4.70||4.46|
The recovery of Human ARSA spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.
|Sample Type||Range (%)||Average Recovery (%)|
|EDTA plasma (n=5)||94-107||100|
|Cell culture media (n=5)||94-111||101|
Samples were spiked with high concentrations of Human ARSA and diluted with Reference Standard & Sample Diluent to produce samples with values within the range of the assay.
|Serum (n=5)||EDTA plasma (n=5)||Cell culture media (n=5)|
An unopened kit can be stored at 4°C for 1 month. If the kit is not used within 1 month, store the items separately according to the following conditions once the kit is received.
|Micro ELISA Plate(Dismountable)||8 wells ×12 strips||-20°C, 6 months|
|Reference Standard||2 vials|
|Concentrated Biotinylated Detection Ab (100×)||1 vial, 120 µL|
|Concentrated HRP Conjugate (100×)||1 vial, 120 µL||-20°C(shading light), 6 months|
|Reference Standard & Sample Diluent||1 vial, 20 mL||4°C, 6 months|
|Biotinylated Detection Ab Diluent||1 vial, 14 mL|
|HRP Conjugate Diluent||1 vial, 14 mL|
|Concentrated Wash Buffer (25×)||1 vial, 30 mL|
|Substrate Reagent||1 vial, 10 mL||4°C(shading light)|
|Stop Solution||1 vial, 10 mL||4°C|
|Plate Sealer||5 pieces|
|Product Description||1 copy|
|Certificate of Analysis||1 copy|
- Set standard, test sample and control (zero) wells on the pre-coated plate and record theirpositions. It is recommended to measure each standard and sample in duplicate. Note: addall solutions to the bottom of the plate wells while avoiding contact with the well walls. Ensuresolutions do not foam when adding to the wells.
- Aliquot 100 µL of standard solutions into the standard wells.
- Add 100 µL of Sample / Standard dilution buffer into the control (zero) well.
- Add 100 µL of properly diluted sample (serum, plasma, tissue homogenates and otherbiological fluids) into test sample wells.
- Cover the plate with the sealer provided in the kit and incubate for 90 min at 37 °C.
- Aspirate the liquid from each well, do not wash. Immediately add 100 µL of BiotinylatedDetection Ab working solution to each well. Cover the plate with a plate seal and gently mix. Incubate for 1 hour at 37 °C.
- Aspirate or decant the solution from the plate and add 350 µL of wash buffer to each welland incubate for 1-2 minutes at room temperature. Aspirate the solution from each well andclap the plate on absorbent filter paper to dry. Repeat this process 3 times. Note: a microplatewasher can be used in this step and other wash steps.
- Add 100 µL of HRP Conjugate working solution to each well. Cover with a plate seal andincubate for 30 min at 37 °C.
- Aspirate or decant the solution from each well. Repeat the wash process for five times asconducted in step 7.
- Add 90 µL of Substrate Reagent to each well. Cover with a new plate seal and incubate forapproximately 15 min at 37 °C. Protect the plate from light. Note: the reaction time can beshortened or extended according to the actual color change, but not by more than 30min.
- Add 50 µL of Stop Solution to each well. Note: Adding the stop solution should be done inthe same order as the substrate solution.
- Determine the optical density (OD value) of each well immediately with a microplate readerset at 450 nm.