Paracoccus

Paracoccus

Paracoccus is a genus of gram-negative bacteria that belongs to the family Enterobacteriaceae. It is characterized by its coccoid shape during exponential growth and the absence of flagellation. Paracoccus species, such as Paracoccus yeei, are aerobic and non-motile, and are sometimes mistaken for Moraxella or Neisseria species due to their oxidase positivity.From: Copper Proteins and Copper Enzymes [1984], Paracoccus yeei, a Novel Bacterial Cause of Endophthalmitis following Intravitreal Injection [2022]

Structure and Evolution of the Small Blue Proteins

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Published in René Lontie, Copper Proteins and Copper Enzymes, 1984

Lars Rydén

The bacterial species mentioned fall in a rather close group. Pseudomonas, Alcaligenes, and Bordetella are found in the Pseudomonaceae, a family of free-living Gram-negative aerobic bacteria. Paracoccus belongs to the Enterobacteriaceae, but resembles several species of the genera Alcaligenes and Pseudomonas, the main difference being the coccoid shape during exponential growth and the absence of flagellation.18Paracoccus denitrificans and some species of Thiobacillus, in particular the denitrifying strains, are in turn quite similar and were earlier confused.19 Doudoroff20 summarizes the situation: “On many grounds, it seems likely that the genera Paracoccus, Pseudomonas, and Alcaligenes are very closely related to each other and that at least the facultatively organotrophic species of the genus Thiobacillus belong in the same generic cluster.”

Paracoccus yeei, a Novel Bacterial Cause of Endophthalmitis following Intravitreal Injection

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Published in Ocular Immunology and Inflammation, 2022

Riyaz Bhikoo, Smathi Chong, Kevin McLeod, Peter Heyworth, Ian L McAllister

Paracoccus yeei is an aerobic, non-motile, gram-negative Coccobacillus sometimes confused with Moraxella or Neisseria species due to oxidase positivity. It often appears vacuolated or peripherally stained (O shape) and is commonly found in soil, and natural and artificial brines. In 2003, Daneshvar et al. carried out an extensive analysis of an unclassified strain of bacteria from 13 human isolates (including an ocular source) and identified a novel bacterial species which was named P. yeeii (later changed to P. yeei).1

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Structure and Evolution of the Small Blue Proteins

Paracoccus yeei, a Novel Bacterial Cause of Endophthalmitis following Intravitreal Injection