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Table 1 The features of 3 different types of bacterial predators

From: Bradymonabacteria, a novel bacterial predator group with versatile survival strategies in saline environments

Current predator type Redefined predator type Prey dependent/independent Metabolic pathway deficiencies Pure-culture cultivable Storing nutrients as polymers Predation strategy Predation specificity
Obligate Obligate Completely prey-dependent High Extremely difficult None Contact-dependent Gram-negative
Bradymonabacteria Facultative Facultatively prey-dependent High Difficult Polyhydroxyalkanoates, polyphosphate, and alkanes Contact-dependent Gram-negative and Gram-positive
Facultative Opportunistic Prey-independent Low Normal Polyphosphatea Mostly contact-independent Gram-negative and Gram-positive
  1. aA polyphosphate accumulation pathway was found in genomes but not determined by experiments