Method and reagent for detecting a ligand in a sample
First Claim
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1. A method of detecting a ligand in a sample, comprising:
- reacting a ligand in a sample with a substance bonded with a Bacillus alkaline phosphatase, the substance having a specific affinity for said ligand, so as to produce reaction products and unreacted substances;
separating the reaction products from the unreacted substances; and
measuring the activity of the alkaline phosphatase bonded with the reaction products or with the unreacted substances;
wherein the alkaline phosphatase has the following physical and chemical properties;
(1) the alkaline phosphatase catalyzes the following reaction;
space="preserve" listing-type="equation">orthophosphoric acid monoester+H.sub.2 O→
alcohol+orthophosphoric acid;
(2) the alkaline phosphatase is used in a buffer containing a Mg++ salt and a Co++ salt;
(3) the alkaline phosphatase is stable at least for 30 minutes when treated at pH 7.5 and 60°
C.;
(4) the alkaline phosphatase has a specific activity of at least 2,300 U/mg;
(5) the alkaline phosphatase has no sugar chain; and
(6) the alkaline phosphatase has a gel filtration molecular weight from 140,000 to 150,000 and a SDS-PAGE molecular weight from 65,000 to 67,000.
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Abstract
A novel alkaline phosphatase and a method for the production of the alkaline phosphatase are described. A method for detecting a ligand in a sample and a method for analyzing the sequence of nucleic acid in a sample using the alkaline phosphatase are also described.
7 Citations
19 Claims
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1. A method of detecting a ligand in a sample, comprising:
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reacting a ligand in a sample with a substance bonded with a Bacillus alkaline phosphatase, the substance having a specific affinity for said ligand, so as to produce reaction products and unreacted substances; separating the reaction products from the unreacted substances; and measuring the activity of the alkaline phosphatase bonded with the reaction products or with the unreacted substances;
wherein the alkaline phosphatase has the following physical and chemical properties;(1) the alkaline phosphatase catalyzes the following reaction;
space="preserve" listing-type="equation">orthophosphoric acid monoester+H.sub.2 O→
alcohol+orthophosphoric acid;(2) the alkaline phosphatase is used in a buffer containing a Mg++ salt and a Co++ salt; (3) the alkaline phosphatase is stable at least for 30 minutes when treated at pH 7.5 and 60°
C.;(4) the alkaline phosphatase has a specific activity of at least 2,300 U/mg; (5) the alkaline phosphatase has no sugar chain; and (6) the alkaline phosphatase has a gel filtration molecular weight from 140,000 to 150,000 and a SDS-PAGE molecular weight from 65,000 to 67,000. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18, 19)
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10. A reagent for detecting a ligand in a biological sample containing a reagent for measuring an alkaline phosphatase and a ligand labeled with an alkaline phosphatase having the following physical and chemical properties or a specific bonding substance to a ligand labeled with an alkaline phosphatase having the following physical and chemical properties:
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(1) the alkaline phosphatase catalyzes the following reaction;
space="preserve" listing-type="equation">orthophosphoric acid monoester+H.sub.2 O→
alcohol+orthophosphoric acid;(2) the alkaline phosphatase is used in a buffer containing a Mg++ salt and a Co++ salt; (3) the alkaline phosphatase is stable at least for 30 minutes when treated at pH 7.5 and 60°
C.;(4) the alkaline phosphatase has a specific activity of at least 2,300 U/mg; (5) the alkaline phosphatase has no sugar chain; and (6) the alkaline phosphatase has a gel filtration molecular weight from 140,000 to 150,000 and a SDS-PAGE molecular weight from 65,000 to 67,000. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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11. A reagent for detecting a ligand in a biological sample containing (I) a substance which has a specific affinity for a ligand to which avidin or biotin is bonded, (ii) an alkaline phosphatase having the following physical and chemical properties to which biotin or avidin is bonded and (iii) a substance for measuring an alkaline phosphatase:
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(1) the alkaline phosphatase catalyzes the following reaction;
space="preserve" listing-type="equation">orthophosphoric acid monoester+H.sub.2 O→
alcohol+orthophosphoric acids;(2) the alkaline phosphatase is used in a buffer containing a Mg++ salt and a Co++ salt; (3) the alkaline phosphatase is stable at least for 30 minutes when treated at pH 7.5 and 60°
C.;(4) the alkaline phosphatase has a specific activity of at least 2,300 U/mg; (5) the alkaline phosphatase has no sugar chain; and (6) the alkaline phosphatase has a gel filtration molecular weight from 140,000 to 150,000 and a SDS-PAGE molecular weight from 65,000 to 67,000.
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Specification