Bacterium
proteobacteria
Subclass of:
Bacteria
Definitions related to proteobacteria:
  • A phylum of bacteria consisting of the purple bacteria and their relatives which form a branch of the eubacterial tree. This group of predominantly gram-negative bacteria is classified based on homology of equivalent nucleotide sequences of 16S ribosomal RNA or by hybridization of ribosomal RNA or DNA with 16S and 23S ribosomal RNA.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • A taxonomic phylum within kingdom Bacteria consisting of gram-negative bacteria with an outer membrane mainly composed of lipopolysaccharides. The group is defined primarily in terms of ribosomal RNA sequences.
    NCI
    U.S. National Cancer Institute, 2021
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