Analyses of four new Caulobacter Phicbkviruses indicate independent lineages

New haptophyte lineages and multiple independent colonizations of freshwater ecosystems.

The diversity and ecological relevance of small haptophytes in marine systems is increasingly recognized. Similar investigations in freshwater remain scarce, despite some recent studies showing the existence of divergent haptophyte lineages and indicating that these microalgae can occur at high abundance in lakes. We studied the diversity of haptophytes in a wide variety of marine, salty contin...

Comparative Genomic Analyses of the Moraxella catarrhalis Serosensitive and Seroresistant Lineages Demonstrate Their Independent Evolution.

The bacterial speciesMoraxella catarrhalishas been hypothesized as being composed of two distinct lineages (referred to as the seroresistant [SR] and serosensitive [SS]) with separate evolutionary histories based on several molecular typing methods, whereas 16S ribotyping has suggested an additional split within the SS lineage. Previously, we characterized whole-genome sequences of 12 SR-lineag...

Analyses and Correlation of Four New Hampshire Bogs

Two independent spiral structures control cell shape in Caulobacter.

The actin homolog MreB contributes to bacterial cell shape. Here, we explore the role of the coexpressed MreC protein in Caulobacter and show that it forms a periplasmic spiral that is out of phase with the cytoplasmic MreB spiral. Both mreB and mreC are essential, and depletion of either protein results in a similar cell shape defect. MreB forms dynamic spirals in MreC-depleted cells, and MreC...

Chlorophyll c-containing plastid relationships based on analyses of a multigene data set with all four chromalveolate lineages.

The chlorophyll c-containing algae comprise four major lineages: dinoflagellates, haptophytes, heterokonts, and cryptophytes. These four lineages have sometimes been grouped together based on their pigmentation, but cytological and rRNA data had suggested that they were not a monophyletic lineage. Some molecular data support monophyly of the plastids, while other plastid and host data suggest d...