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EP0059624A2
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EP
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Isolation of principal outer membrane protein and antigen of chlamydia trachomatis
Assignee: University of California
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Filing: 1982-02-26
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Granted: —
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Expires: 2002-02-26
Abstract
Abstract Procedures are presented for isolating the major outer membrane protein of Chlamydia trachomatis. The isolated protein is a species specific antigen which comprises about 60% of the C. trachomatis cell outer membrane structure. The protein has a molecular weight ranging from about 38,000 to 44,000 daltons, with a mean molecular weight of about 39,500 daltons. The protein antigen is purified from C. trachomatis cells by first extracting the cell contents with a mild anionic detergent, preferably sarcosyl, to leave a residue of intact outer cell membranes. These outer cell membranes are then extracted with a strong anionic detergent, preferably sodium dodecyl sulfate, which solubilizes the 39,500 dalton antigen. The antigen is then purified by hydroxylapatite chromatography. The antigen is species specific for Chlamydia trachomatis and may be utilized in assaying Chlamydial infection in mammals.
Inventors
- 👤 Harlan D. Caldwell
- 👤 Julius Schachter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 08:07
CPC Classifications
C; C07; C07K; C07K16/00; C07K16/12; C07K16/1203; C07K16/125; C07K14/00; C07K14/195; C07K14/295; A; A61; A61K; A61K38/00; A61K39/00; Y; Y10; Y10S; Y10S435/00; Y10S435/961; Y10S436/00; Y10S436/811; Y10S530/00; Y10S530/806; Y10S530/82; Y10S530/825
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
28 words
As a species specific antigen for Chlamydia trachomatis, the principal outer membrane protein of Chlamydia trachomatis micro-organisms having a molecular weight ranging from about 38,000 to 44,000 daltons.
Claim 2
Dependent Claim
28 words
As a species specific antigen for Chlamydia trachomatis, the principal outer membrane protein of Chlamydia trachomatis micro-organisms having a molecular weight ranging from about 38,000 to 44,000 daltons.
Claim 3
Dependent Claim
19 words
The species specific antigen of claim 1 wherein the antigen has a mean molecular weight of about 39,500 daltons.
Claim 4
Independent Claim
64 words
A method for isolating a species specific protein antigen of Chlamydia trachomatis comprising separating the outer cell membrane material of Chlamydia trachomatis micro-organisms from the remainder of the cell contents, and then contacting said separated outer cell membrane material with a strongly anionic detergent to solubilize the protein antigen, and thereafter recovering the protein antigen from the detergent solution, and purifying the protein antigen.
Claim 5
Independent Claim
64 words
A method for isolating a species specific protein antigen of Chlamydia trachomatis comprising separating the outer cell membrane material of Chlamydia trachomatis micro-organisms from the remainder of the cell contents, and then contacting said separated outer cell membrane material with a strongly anionic detergent to solubilize the protein antigen, and thereafter recovering the protein antigen from the detergent solution, and purifying the protein antigen.
Claim 6
Dependent Claim
21 words
The method of claim 3 wherein the purified protein antigen has a molecular weight of between about 38,000 and 44,000 daltons.
Claim 7
Dependent Claim
19 words
The method of claim 4 wherein the protein antigen has a mean molecular weight of about 39,500 daltons. =
Claim 8
Dependent Claim
36 words
The method of claim 3 wherein the remainder of the cell contents are solubilized by contacting elementary bodies of Chlamydia trachomatis with a mild anionic detergent and in which the outer cell membrane is essentially insoluble.
Claim 9
Dependent Claim
14 words
The method of claim 6 wherein the mild anionic detergent is a sarcosine detergent.
Claim 10
Dependent Claim
13 words
The method of claim 7 wherein the sarcosine detergent is sodium N-lauroyl sarcosine.
Claim 11
Dependent Claim
26 words
The method of claim 3 wherein the separated outer cell membrane is contacted with a salt of an alkyl sulfate detergent to solubilize the protein antigen.
Claim 12
Dependent Claim
17 words
The method of claim 9 wherein the salt of an alkyl sulfate detergent is sodium dodecyl sulfate.
Claim 13
Dependent Claim
16 words
ll. The method of claim 9 wherein the solubilized protein antigen is purified by hydroxylapatite chromatography.
Claim 14
Independent Claim
60 words
A method for assaying the presence of Chlamydial infection in a mammal comprising conducting an immunodiagnostic test on serum secured from said mammal against protein antigen purified from the outer cell membrane of Chlamydia trachomatis organisms and which protein antigen comprises the major component of the Chlamydia cell membrane structure and has a mean molecular weight of about 39,500 daltons.
Claim 15
Independent Claim
60 words
A method for assaying the presence of Chlamydial infection in a mammal comprising conducting an immunodiagnostic test on serum secured from said mammal against protein antigen purified from the outer cell membrane of Chlamydia trachomatis organisms and which protein antigen comprises the major component of the Chlamydia cell membrane structure and has a mean molecular weight of about 39,500 daltons.
Claim 16
Dependent Claim
13 words
The method of claim 12 wherein the immunodiagnostic test is a radioimmune assay.
Claim 17
Dependent Claim
16 words
The method of claim 12 wherein the immunodiagnostic test is an enzyme linked immuno absorbent assay.
Claim 18
Dependent Claim
18 words
A lyophilized composition containing Chlamydia trachomatis outer membrane protein having a mean molecular weight of about 39,500 daltons.
Claim 19
Dependent Claim
18 words
A lyophilized composition containing Chlamydia trachomatis outer membrane protein having a mean molecular weight of about 39,500 daltons.
Claim 20
Dependent Claim
48 words
Antisera compositions useful in immuno diagnostic assays of Chlamydia trachomatis infection in mammals, said compositions being recovered from the blood serum of animals which have been previously inoculated with the prinipal outer membrane protein of Chlamydia trachomatis, said protein having a mean molecular weight of about 39,500 daltons.
Claim 21
Dependent Claim
48 words
Antisera compositions useful in immuno diagnostic assays of Chlamydia trachomatis infection in mammals, said compositions being recovered from the blood serum of animals which have been previously inoculated with the prinipal outer membrane protein of Chlamydia trachomatis, said protein having a mean molecular weight of about 39,500 daltons.
References Cited (Backward Citations)
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