Team:University College London/Research/MarineBacteria


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Marine Chassis

Roseobacter clade bacteria

In consultation with Paola R. Gomez-Pereira of the National Oceanography Centre, Southampton, we identified Oceanibulbus indoliflex and Roseobacter dentitrificans as promising chassis for the expression of our system.

The roseobacter clade bacteria, RCB, constitute a significant proportion of coastal and mixed layer ocean bacterioplankton communities, upwards of 15 and 20% respectively, and are found in a diverse range of marine habitats.

RCB demonstrate numerous traits, including aerobic anoxygenic phototrophy, implication in carbon monoxide consumption, aromatic compound degradation and recycling of sulphur within the water column. (Wagner-Döbler & Biebl, et al. 2006).

Significantly, in the context of plastic Island, they are shown to be major colonisers of submerged surfaces in marine waters. (Dang & Lovell et al. 2002).

Colony Morphology

UniversityCollegeLondon O indolifex Transformed Wide.jpg UniversityCollegeLondon O indolifex Transformed Medium.jpg UniversityCollegeLondon O indolifex Transformed Close.jpg

Transformation Protocols

Transformation of Oceanibulbus Indoliflex by chemical and electrocompetency methods.

Chemically competent cells were prepared using the following protocol:

Electrocompetent cells were prepared according to the following protocol a

45mL Marine Broth was inoculated with 2ml of an overnight culture of OI (in 5ml Marine broth) and grown to approx 0.5 Absorbance at OD 578.

10mL volumes were transferred to 50 mL falcons and cells were sedimented for 15mins at 3200 x g in a pre-chilled centrifuge.

Cells were washed 5 times with 10% (v/v) glycerol, and finally resuspended in 400uL 10% (v/v) glycerol.

50uL aliquots were made and stored at -80C.

1uL DNA was added to 50uL competent cells to chilled 1mm electrocuvettes, and treated with a field strength of 2.5kV.

1ml marine broth was added to cells and mixtures were transferred to falcons for incubation overnight at room temperature at 200rpm and finally plated on marine agar supplemented with appropriate antibiotics. Incubated at 30˚C for 2 days.

Growth comparison

Growth comparison of Oceanibulbus indoliflex and Escherichia coli in marine and luria broth. We sought to compare the growth profiles of O. indoliflex and E. coli. Data goes here:


1. Brinkhoff, T., Giebel, H.-A., & Simon, M. (2008). Diversity, ecology, and genomics of the Roseobacter clade: a short overview. Archives of microbiology, 189(6), 531–9.

2. Piekarski, T., Buchholz, I., Drepper, T., Schobert, M., Wagner-Doebler, I., Tielen, P., & Jahn, D. (2009). Genetic tools for the investigation of Roseobacter clade bacteria. BMC microbiology, 9, 265.