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CaulobacterRANK: GenusTAXONOMY: cellular organisms -> Bacteria -> Proteobacteria -> Alphaproteobacteria -> Caulobacterales -> Caulobacteraceae -> Caulobacter OVERVIEW: Cells single, unbranched, with tapered poles; long axis typically distinctly curved, conferring a vibrioid shape, but may be straight in some isolates and the cell shape fusiform; 0.4–0.6 × 1–2 µm during growth in most media. The younger pole of the dividing cell bears a single flagellum, and the older pole bears a prostheca (the stalk) developed by outgrowth of the cell envelope. The stalk includes outer membrane, peptidoglycan, cell membrane, and a core sometimes observed to be occupied in part by membranes but not in any case by any other discernible cytoplasmic components. Stalk diameter is constant along its length, varying from 0.11 to 0.18 µm among isolates; the stalk possesses at least one stalk band as a substructure after the cell has matured and completed at least one cell cycle. Binary fission is constrictive and is completed without formation of a septum. The stalk-bearing progeny cell grows and eventually repeats the asymmetric cell division. The flagellum-bearing progeny cell, after a period of motility, releases the flagellum and develops its stalk at the previously flagellated site as it grows and proceeds to its asymmetric cell division. At the base of the flagellum and at the outer tip of the stalk is a small mass of adhesive material, the holdfast, which confers adhesiveness on each of the progeny.The mol% G + C of the DNA is: 62–65.Type species: Caulobacter vibrioides
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