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Most Streptococcus genomes are 1.8 to 2.3 Mb in size and encode 1,700 to 2,300 proteins. Some important genomes are listed in the table. [ 33 ] The four species shown in the table ( S. pyogenes, S. agalactiae, S. pneumoniae , and S. mutans ) have an average pairwise protein sequence identity of about 70%.
Streptococcosis encompasses a spectrum of diseases caused by bacteria from the genera Streptococcus and Lactococcus. [12] Various species within these genera can cause infections in both wild and cultured animals, including fish and terrestrial species. Commonly affected organisms include:
In Streptococcus pneumoniae, transformation is induced by the DNA damaging agent mitomycin C. [18] These, and other, examples indicate that prokaryotic sex, like meiosis in simple eukaryotes, is an adaptation to stressful conditions. This observation suggests that the natural selection pressures maintaining meiosis in eukaryotes are similar to ...
Streptococcus pyogenes is a species of Gram-positive, aerotolerant bacteria in the genus Streptococcus.These bacteria are extracellular, and made up of non-motile and non-sporing cocci (round cells) that tend to link in chains.
Gene conversion is the process by which one DNA sequence replaces a homologous sequence such that the sequences become identical after the conversion. [1] Gene conversion can be either allelic, meaning that one allele of the same gene replaces another allele, or ectopic, meaning that one paralogous DNA sequence converts another.
The system, created by Rebecca Lancefield, was historically used to organize the various members of the family Streptococcaceae, which includes the genera Lactococcus and Streptococcus, but now is largely superfluous due to explosive growth in the number of streptococcal species identified since the 1970s. [2]
Genus: Streptococcus The viridans streptococci are a large group of commensal streptococcal Gram-positive bacteria species that are α-hemolytic , producing a green coloration on blood agar plates (hence the name "viridans", from Latin "vĭrĭdis", green), although some species in this group are actually γ-hemolytic, meaning they produce no ...
[1] [3] [4] The plural term group B streptococci (referring to the serotypes) and the singular term group B streptococcus (referring to the single species) are both commonly used synonymously with S. agalactiae even though S. halichoeri and S. pseudoporcinus are also group B Streptococci. These species test positive as group B, but are not ...