Supplementary Material (ESI) for Molecular BioSystems This journal is © The Royal Society of Chemistry 2009 The list of 61 different growth conditions, data of which is used to study the conditional essentilaity. 1: 20 ug of Total RNA from MG1655 (Repaired NCM 3416) in M9 at 30 degrees OD 600=0.8 2: 20 ug of Total RNA from MG1655 (Repaired NCM 3416) in LB at 30 degrees OD 600=0.8 3: Wild Type (N3433) M9 + 0.2% Glycerol, 0.2% Tryptone at 30 C Mid Log 4: RhlB- (SU02) in M9 + 0.2% Glycerol, 0.2% Tryptone at 30 C Mid Log 5: Wild Type (K10) M9 + 0.2% Glycerol, 0.2% Tryptone, 40 mM Suc. at 30 C Mid Log 6: Eno- (DF261) in M9 + 0.2% Glycerol, 0.2% Tryptone, 40mM Suc. at 30 C Mid Log 7: Pnp- (YHC012) in M9 + 0.2% Glycerol, 0.2% Tryptone at 30 C Mid Log 8: WT (SH3208) M9 + 0.2% Glycerol, 0.2% Tryptone at 30 C Mid Log 9: N-RNaseE (BZ453) in M9 + 0.2% Glycerol, 0.2% Tryptone at 30 C Mid Log 10: 10min UV treated cells, 25 ug total RNA 11: 20min untreatedcells, 25 ug total RNA 12: 20min UV treated cells, 25 ug total RNA 13: 40min untreatedcells, 25 ug total RNA 14: 5min untreatedcells, 25 ug total RNA 15: 60min untreatedcells, 25 ug total RNA 16: 60min UV treated cells, 25 ug total RNA 17: lexA 20 min after NOuv, 25 ug total RNA, 2 ug pdN6 18: lexA 60 min after NOuv, 25 ug total RNA, 2 ug pdN6 19: lexA 10 min after UV treatment, 25 ug total RNA, 2 ug pdN6 20: lexA 20 min after UV treatment, 25 ug total RNA, 2 ug pdN6 21: lexA 40 min after UV treatment, 25 ug total RNA, 2 ug pdN6 22: lexA 5 min after UV treatment, 25 ug total RNA, 2 ug pdN6 23: lexA 60 min after UV treatment, 25 ug total RNA, 2 ug pdN6 24: 0' lexA, before UV 25 ug total RNA, 2 ug pdN6 25: 5' in minimal medium +0.2% glu, 25 ug total RNA 26: 15' in minimal medium +0.2% glu, 25 ug total RNA 27: 30' in minimal medium +0.2% glu, 25 ug total RNA 28: 60' in minimal medium +0.2% glu, 25 ug total RNA 29: 5' in min med +0.2% glu+50ug/ml Trp,25ug total RNA 30: 15' in min med +0.2% glu+50ug/ml Trp,25ug total RNA 31: 30' in min med +0.2% glu+50ug/ml Trp,25ug tot RNA 32: 60' in min med +0.2% glu+50ug/ml Trp,25ug tot RNA 33: tnaA2trpR2, W3110 min +Trp 50ug/ml, 30 ug total 34: W3110 trpR2,min+.2%glucose, 30 ug RNA 35: trpR2+50ug/ml Trp, 30 ug total RNA 36: W3110 trpR2+trp, 30 ug total RNA 37: trpEA2trpR2, W3110 min +Trp 50ug/ml, 30 ug total 38: tnaA2trpA46PR9, W3110 min , 30 ug total 39: 5' 10 ug/ml indole aa, minimal medium + 0.2% glu, 25 ug total 40: 15' 10 ug/ml indole aa, minimal medium + 0.2% glu, 25 ug total 41: 30' 10 ug/ml indole aa, minimal medium + 0.2% glu, 25 ug total 42: 60' 10 ug/ml indole aa, minimal medium + 0.2% glu, 25 ug total 43: 5' 15 ug/ml indole aa, minimal medium + 0.2% glu, 25 ug total 44: 15' 15 ug/ml indole aa, minimal medium + 0.2% glu, 25 ug total 45: 30' 15 ug/ml indole aa, minimal medium + 0.2% glu, 25 ug total RNA 46: 60' 15 ug/ml indole aa, minimal medium + 0.2% glu, 25 ug total 47: JCB570, OD600=0.5 48: JQ004 (rraA deleted), OD600=0.5 49: JCB570, OD600=1.0 50: JQ004 (rraA deleted), OD600=1.0 51: JCB570, OD600=0.3 52: JQ004 (rraA deleted), OD600=0.3 53: W3110 wt OD420~0.3 in MOPS (ile, val, thi) + Leu, 20 ug total RNA, 10 ug pdN6 54: W3110 lrp- at OD420~0.3 in MOPS (ile, val, thi) + Leu, 20 ug total RNA ,10 ug pdN6 55: W3110 wt in MOPS (ile, val, thi) at OD420~0.3, 20 ug total,10 ug pdN6 56: W3110 lrp- at OD420~0.3 in MOPS (ile, val, thi), 20 ug total, 10 ug pdN6 57: WT1088 in LB at 37 Mid Log Phase 58: dpiA 2x Overexpression pHI1429 in LB at 37 Mid Log Phase 59: N3433 (wt) in LB at 30 degrees C 60: N3433 (rne deletion) pBAD-RNE w/out Arabinose in LB at 30 degrees C 61: N3433 (rng deletion) in LB at 30 degrees C