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    Conditions for growth of Rhodobacter sphaeroides in different media 

    Rosemarie Wilton, Jaya K Yakha, laible, Deborah K Hanson

    Published: 2022-10-08 DOI: 10.17504/protocols.io.kxygx9emog8j/v1
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    Abstract

    This protocol provides a method for culturing Rhodobacter sphaeroides wildtype 2.4.1 and its KO strains in shake flask and BioTek Epoch 2, 48-well microplates. A baffled side arm flask is used but other flasks can be used with appropriate modifications.

    Steps

    Conditions for growth of Rhodobacter sphaeroides in GYCC medium in shake flasks

    1.

    Inoculate a GYCC agar plate from a glycerol stock containing appropriate antibiotic (if necessary) and incubate at 33°C in an incubator in dark.

    2.

    After 72h 0m 0s pick one colony from the plate and inoculate 80 ml fresh GYCC medium with appropriate antibiotic (if necessary) in 125mL baffled side arm flask.

    3.

    Incubate at 33°C shaking at 125rpm for 72 -96 hours.

    4.

    Monitor the growth of the culture with regular measurement of turbidity. Side-arm flasks are especially convenient for the determination of culture turbidity with a Klett-Summerson colorimeter. The equivalent OD600 may also be used if side arm flasks are not used.

    Conditions for growth of R. sphaeroides in GYCC or MR26 medium in Microplate

    5.

    Inoculate GYCC or MR26 agar plates from a glycerol stock containing appropriate antibiotic if necessary and incubate at 33°C .

    6.

    After 72h 0m 0ss pick one colony from the plate and inoculate 25 ml fresh medium of GYCC or MR26 containing appropriate antibiotic (if necessary) in 50mL flask

    7.

    Incubate at 33°C with shaking at 125rpm for 72 -96 hours.

    8.

    Monitor the growth of the culture with measurement of turbidity. Once the culture reaches to the log phase (OD600~0.7), the starter culture is ready for inoculation of the microplate.

    9.

    For each well 600, µl of fresh GYCC or MR26 medium was added. It is recommended to use Microplate Greiner BioOne 48 well (Item no. 677180) for compatibility with a BioTek Epoch2 microplate reader

    Procedure Details in microplate reader

    9.1.

    Plate Type: Greiner BioOne 48-wellv2 (Use plate lid)

    Eject plate on completion

    Set Temperature: Setpoint 33°C, Gradient 2 °C

    Start Kinetic: Runtime 96:00:00 (HH:MM:SS), Interval 0:15:00, 385 Reads

    Shake Double Orbital: Continuous

    Frequency: 548 cpm (2 mm)

    Read:A600

    Absorbance Endpoint

    Full Plate

    Wavelengths:600

    Read Speed: Normal, Delay: 200 msec, Measurements/Data Point: 8

    End Kinetic

    10.

    Once the run is complete, export the data in a .txt or .xls file and save in an appropriate . Analyze and visualize the data by any software.

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