Micrococci
| Micrococcus | |
|---|---|
 |
|
| Micrococcus mucilaginosis | |
| Scientific classification | |
| Kingdom: | Bacteria |
| Phylum: | Actinobacteria |
| Class: | Actinobacteria |
| Subclass: | Actinobacteridae |
| Order: | Actinomycetales |
| Suborder: | Micrococcineae |
| Family: | Micrococcaceae |
| Genus: |
Micrococcus Cohn 1872 |
| Species | |
|
Micrococcus aloeverae |
|
Micrococcus aloeverae
Micrococcus antarcticus
Micrococcus cohnii
Micrococcus endophyticus
Micrococcus flavus
Micrococcus lactis
Micrococcus luteus
Micrococcus lylae
Micrococcus mucilaginosis
Micrococcus roseus
Micrococcus terreus
Micrococcus mortus
Micrococcus yunnanensis
Micrococcus (mi’ krō kŏk’ Əs) is a genus of bacteria in the Micrococcaceae family. Micrococcus occurs in a wide range of environments, including water, dust, and soil. Micrococci have Gram-positive spherical cells ranging from about 0.5 to 3 micrometers in diameter and typically appear in tetrads. They are catalase positive, oxidase positive, indole negative and citrate negative. Micrococcus has a substantial cell wall, which may comprise as much as 50% of the cell mass. The genome of Micrococcus is rich in guanine and cytosine (GC), typically exhibiting 65 to 75% GC-content. Micrococci often carry plasmids (ranging from 1 to 100 MDa in size) that provide the organism with useful traits.
Some species of Micrococcus, such as M. luteus (yellow) and M. roseus (red) produce yellow or pink colonies when grown on mannitol salt agar. Isolates of M. luteus have been found to overproduce riboflavin when grown on toxic organic pollutants like pyridine.Hybridization studies indicate that species within the genus Micrococcus are not closely related, showing as little as 50% sequence similarity. This suggests that some Micrococcus species may, on the basis of ribosomal RNA analysis, eventually be re-classified into other microbial genera.
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