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Site specific antibodies directed to the ATP binding region of some kinases
1Department of Chemistry, Indian Institute of Technology, Kanpur.
Abstract:
Polyclonal antibodies raised in rabbits to ATP-requiring enzymes such as 3-phosphoglycerate kinase show cross-reactivity against other unrelated kinases. Our results show that rabbit polyclonal antiserum possesses antibodies that recognize an antigenic site at the ATP binding region of kinases. A classical immunotitration curve was obtained when hexokinase was titrated against anti-myokinase IgG. The immunoinhibitions was reversed in the presence of small concentration of ATP. This cross-reactivity between site specific antibody and unrelated kinase demonstrates the existence of an antigenic site around the ATP binding region. Our proposal of the existence of a common antigenic determinant in the ATP binding region is in agreement with the finding of a common structural domain that binds ATP.
Insights
Rabbit antibodies recognize a common site on unrelated kinases, specifically at the ATP binding region. This cross-reactivity, reversed by ATP, suggests a shared antigenic determinant crucial for kinase function.
Area of Science:
- Biochemistry
- Immunology
- Enzymology
Background:
- Polyclonal antibodies can exhibit cross-reactivity against various proteins.
- ATP-requiring enzymes share functional similarities.
Purpose of the Study:
- To investigate cross-reactivity of antibodies against ATP-binding enzymes.
- To identify common antigenic sites in kinases.
Main Methods:
- Generating polyclonal antibodies in rabbits against specific ATP-requiring enzymes.
- Performing immunotitration assays with enzymes like hexokinase and anti-myokinase IgG.
- Assessing the effect of ATP on antibody-enzyme interactions.
Main Results:
- Rabbit polyclonal antiserum showed cross-reactivity with unrelated kinases.
- Antibodies recognized an antigenic site within the ATP binding region.
- Immunoinhibition was reversed by low concentrations of ATP.
Conclusions:
- A common antigenic determinant exists in the ATP binding region of kinases.
- This finding supports the existence of a conserved structural domain for ATP binding across different kinases.