Abstract
Filter-fixed deoxyribonucleic acid preparations from organisms of the Neisseriaceae and from two unpigmented, psychrophilic, misnamed “Achromobacter” strains were hybridized with labeled ribosomal ribonucleic acids (rRNAs) from Acinetobacter calcoaceticus ATCC 23055T(T = type strain), Alteromonas macleodii ATCC 27126T, Escherichia coli B, Pasteurella multocida NCTC 10322T, Actinobacillus lignieresii NCTC 4189T, Vibrio parahaemolyticus ATCC 17802T, Pseudomonas fluorescens MMCA 40T, Deleya aquamarina NCMB 557, Marinomonas vaga ATCC 27119T, Xanthomonas campestris NCPPB 528T, Alcaligenes denitrificans ATCC 15173T, Pseudomonas solanacearum NCPPB 325T, Pseudomonas acidovorans ATCC 15668T, Alcaligenes faecalis NCIB 8156T, Janthinobacterium lividum NCTC 9796T, Chromobacterium violaceum NCTC 9757T, Acetobacter aceti NCIB 8621T, Agrobacterium tumefaciens ICPB TTIII, and Rhizobium meliloti NZP 4009. The results revealed that the present members of the Neisseriaceae are genetically very heterogeneous. This family contains at least five unrelated groups. One group is located in rRNA superfamily III (containing the Pseudomonas acidovorans complex, Alcaligenes, Janthinobacterium, etc.) and includes the “true neisseriae,” Kingella kingae, and Kingella denitrificans. The present emended family Neisseriaceae should be limited to these organisms. Its closest genetic relative is Chromobacterium. Another group, formed by Acinetobacter, Moraxella, Branhamella, the “false neisseriae,” and the misnamed achromobacters, should be removed from the Neisseriaceae; it is somewhat related to organisms belonging to rRNA superfamily II (containing the Pseudomonas fluorescens complex, Marinomonas, etc.). Kingella indologenes does not belong to either of these groups and is situated between rRNA superfamily I (containing the Enterobacteriaceae, Pasteurellaceae, etc.) and rRNA superfamily II. Moraxella urethralis and Moraxella anatipestifer are not at all related to other members of the genus Moraxella.
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