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. 1975 Aug;123(2):620–630. doi: 10.1128/jb.123.2.620-630.1975

Immunological study of anthranilate synthetase.

J J Reiners Jr, H Zalkin
PMCID: PMC235768  PMID: 50316

Abstract

An immunological study of anthranilate synthetase (ASase) has been initiated using quantitative precipitation, enzyme neutralization, and immunodiffusion methods. Cross-reactivity of anthranilate synthetase-anthranilate-5-phosphoribosylpyrophosphate phosphoribosyltransferase (ASase-PRTase) from Escherichia coli, Klebsiella aerogenes, and Salmonella typhimurium and ASase from Serratia marcescens and Pseudomonas putida was detected with antibodies to ?E. coli trypsin-treated ASase. Cross-reactivity of antigens was also obtained with S. marcescens anti-ASase. Indices of dissimilarity verified the overall structural similarity of ASase-PRTase from E. coli, K. aerogenes, and S. typhimurium and the divergence from S. marcescens ASase. Further divergence of these enzymes from ASase in B. subtilis and P. putida was apparent. Precipitation of ASase components I and II (ASase CoI and ASase CoII) was obtained using anti-ASase or antiserum fractionated to contain component-specific antibodies. Anti-ASase inhibited enzyme activity to binding to determinants on both subunits. Anti-ASase CoI inhibited the ammonia-dependent reaction and interfered with amide transfer from glutaminyl-ASase CoII. Anti-ASase CoII inhibited the glutamine reaction by blocking amide transfer. Enzyme neutralization experiments indicate more conservation of determinants at the active site region of ASase CoII compared to ASase CoI in the enterobacteria. A particulate form of ASase-PRTase in E. coli, K. aerogenes, and S. typhimurium could be distinguished by quantitative precipitation and immunodiffusion.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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