R2YE

R2YE

R2YE medium is a variation of R2 containing yeast extract.

Preparation

Make up the following solution:

• 103 g Sucrose
• 0.25 g K₂SO₄
• 10.12 g MgCl₂.6H₂O
• 10 g Glucose
• 0.1 g Difco Casaminoacids
• 800 ml dH₂O

Pour 80 ml of the solution into 250 ml Erlenmeyer flasks each containing 2.2 g Difco Bacto agar. Sterilise by autoclaving. At the time of use, remelt the medium and add to each flask the following autoclaved solutions in the order listed:

• 5 ml Difco yeast extract (10%)
• 1 ml KH₂PO₄ (0.5%)
• 8 ml CaCl₂.2H₂O (3.68%)
• 1.5 ml L-proline (20%)
• 10 ml TES buffer (5.73%, adjusted to pH7.2)
• 0.2 ml Trace element solution
• 0.5 ml NaOH (1N) (unsterilised is okay)
• 0.75 ml Required growth factors for auxotrophs

Uses

• Protoplasts regeneration

Notes

Streptomyces clavuligerus does not utilise glucose and it must be substituted by glycerol.

References

Kieser, T., Bibb, M.J., Buttner, M.J., Chater, K.F. and Hopwood, D.A. (2000) Practical Streptomyces Genetics: John Innes Foundation, Norwich Research Park, Colney, Norwich NR4 7UH, UK

Thompson CJ, Ward JM, Hopwood DA (1980) DNA cloning in Streptomyces: resistance genes from antibiotic-producing species. Nature, 286, 525-527.