McClean:LFM Recipe

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Standard media except with low-fluorescence yeast nitrogen base. (Yeast nitrogen base without riboflavin and folic acid.) Final Desired Composition of Yeast Nitrogen Base (Note: Ca¬2Cl is left completely out for calcium free media; calcium pantothenate is substituted with sodium pantothenate)

	5 g/l (NH4)2SO4  (or alternate nitrogen source)
	1 g/l KH2PO4 
	0.5 g/l MgSO4 
	0.1 g/l NaCl 
	0.1 g/l Ca2Cl 
	0.5 mg/l H3BO4 
	0.04 mg/l CuSO4 
	0.1 mg/l KI 
	0.2 mg/l FeCl3 
	0.4 mg/l MnSO4 
	0.2 mg/l Na2MoO4 
	0.4 mg/l ZnSO4 
	2 µg/l biotin 
	0.4 mg/l calcium pantothenate 
	2 mg/l inositol 
	0.4 mg/l niacin 
	0.2 mg/l PABA 
	0.4 mg/l pyridoxine HCl 
	0.4 mg/l thiamine 

Stock Solutions

10X Ammonium Sulfate 50g (NH4)2SO4; dissolve in ddIH20, bring to 1L total volume, autoclave

10X Potassium Phosphate 10g KH2PO4; dissolve in ddIH20, bring to 1L total volume, autoclave 100x magnesium sulfate 50g MgSO4; dissolve in ddIH20; bring to 1L total volume, autoclave 200X NaCl 10g NaCl, dissolve in ddIH20, bring to 500ml total volume, autoclave 200X Ca2Cl 10g Ca2Cl, dissolve in ddIH20, bring to 500ml total volume, autoclave

1000X Metals (directly from Maitreya Dunham’s chemostat manual)

Metals are made as a 1000X stock that keeps at room temperature for at least a year. Keep the bottle well wrapped in foil since some of the metals are light sensitive. Make the metals in sterile milliQ to avoid contamination. Shake before using since the metals will not totally dissolve.

Dissolve chemicals in ~1 L milliQ in the following order:

500 mg boric acid (H3BO3) 40 mg copper sulfate.5H2O (CuS04) 100 mg potassium iodide (KI) 200 mg ferric chloride.6H2O (FeCl3) 400 mg manganese sulfate.H2O (MnS)4) 200 mg sodium molybdate.2H2O (Na2MoO4) 400 mg zinc sulfate.7H2O (ZnSO4)

Bring total volume to 1 L with milliQ water.

2000X Vitamins (Taken directly from Maitreya Dunham’s chemostat protocol except we make a 2000X stock and DO NOT use folic acid or riboflavin for low fluorescence media. Substitute sodium pantothenate for calcium pantothenate for calcium free media) Vitamins are also made as a 2000X stock. The solution is aliquoted into 50 ml Falcon tubes and stored at -20C. Don't fill the tubes to the top, or else the lid will split when frozen. The "working tube" can be stored at 4C. The vitamins will not dissolve completely, so shake before use. Care should be taken to keep the solution well mixed while aliquoting.

2 mg Biotin (Biotin is in the 4C) 400 mg calcium pantothenate 2000 mg inositol (aka myo-inositol) 400 mg niacin (aka nicotinic acid) 200 mg p-aminobenzoic acid 400 mg pyridoxine HCl 200 mg riboflavin 400 mg thiamine HCl

Final Composition of Media (1L total) 100 ml of 10X nitrogen source (ammonium sulfate or alternative) 100 ml of 10X potassium phosphate 100 ml of 20% glucose 100ml of 10x amino acid supplement 10ml of 100X MgSO4 5ml of 200x NaCl 5ml of 200x Ca2Cl 1ml of 1000X metals 500 μL of 2000x vitamins 578 ml of sterile H20

Adapted from: Sheff MA, Thorn KS. Optimized cassettes for fluorescent protein tagging in Saccharomyces cerevisiae. Yeast 2004; 21: 661–670 AND Saldanha, AJ et al 2004 Mol Bio Cell AND Maitreya Dunham

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