Immunological relatedness of histidine ammonia-lyases from some species of Pseudomonas: taxonomic implication.

1. Histidine ammonia-lyases (histidase EC 4.3.1.3) from Pseudomonas testosteroni NCIB 10808 and Pseudomonas putida NCIB 10807 were purified and specific antibody was raised to each separately in a rabbit. 2. Immunological cross-reactions of each antibody to histidine ammonia-lyases from various species of Pseudomonas were examined by the enzyme inhibition test. 3. The immunological data obtained suggest that these Pseudomonas species can be classified into three groups. These cross-reactions tend to indicate a certain degree of homology within species in a group but not between groups.