Table 4

13C labeling patterns of amino acids in cell hydrolysates of Saccharomyces cerevisiae cultivatedon [1-13C] glucose in chemostat under aerobic glucose-limited conditions at different growth rates.

Measured Metabolite
Purely Oxidative Growth (μ = 0.15 h-1)
Respiro-Fermentative Growth (μ = 0.30 h-1)
Mainly Fermentative Growth (μ = 0.40 h-1)

M0
M1
M2
M0
M1
M2
M0
M1
M2

Alanine (m/z 260, C1–3)









calca
0.647
0.328

0.596
0.380

0.539
0.435

expb
0.652
0.331

0.597
0.381

0.543
0.442











Alanine (m/z 232, C2–3)









calc
0.671
0.316

0.618
0.372

0.561
0.427

exp
0.666
0.325

0.615
0.374

0.549
0.442











Glycine (m/z 246, C2)









calc
0.922
0.074

0.932
0.065

0.964
0.035

exp
0.922
0.074

0.931
0.064

0.963
0.036











Valine (m/z 186, C2–5)









calc
0.450
0.424
0.117
0.365
0.457
0.165
0.308
0.471
0.203
exp
0.442
0.424
0.116
0.361
0.451
0.165
0.301
0.480
0.203










Valine (m/z 260, C2–5)









calc
0.450
0.424
0.117
0.365
0.457
0.165
0.308
0.471
0.203
exp
0.442
0.428
0.120
0.364
0.457
0.170
0.300
0.475
0.206










Valine (m/z 288, C2–5)









calc
0.434
0.425
0.128
0.346
0.451
0.179
0.288
0.464
0.220
exp
0.435
0.429
0.125
0.355
0.456
0.174
0.294
0.475
0.210










Serine (m/z 288, C2–3)









calc
0.694
0.303

0.628
0.369

0.566
0.430

exp
0.693
0.300

0.624
0.366

0.569
0.422











Serine (m/z 362, C2–3)









calc
0.694
0.303

0.628
0.369

0.566
0.430

exp
0.693
0.302

0.623
0.369

0.567
0.424











Serine (m/z 390, C1–3)









calc
0.682
0.311

0.611
0.375

0.560
0.431

exp
0.682
0.308

0.617
0.370

0.564
0.428











Threonine (m/z 376, C2–4)









calc
0.541
0.381

0.526
0.409

0.515
0.440

exp
0.540
0.387

0.521
0.409

0.504
0.455











Threonine (m/z 404, C1–4)









calc
0.496
0.396

0.504
0.413

0.488
0.444

exp
0.500
0.398

0.505
0.411

0.496
0.455











Aspartate (m/z 418, C1–4)









calc
0.496
0.396

0.504
0.413

0.488
0.444

exp
0.502
0.399

0.506
0.415

0.499
0.454











Arginine (m/z 414, C1–5)









calc
0.302
0.417
0.219
0.239
0.410
0.261
0.263
0.450
0.241
exp
0.309
0.415
0.218
0.245
0.406
0.260
0.263
0.450
0.244










Phenylalanine (m/z 336, C1–9)









calc
0.379
0.429
0.166
0.304
0.437
0.212
0.240
0.442
0.262
exp
0.371
0.417
0.166
0.305
0.431
0.212
0.238
0.437
0.263










Phenylalanine (m/z 302, C1–2)









calc
0.973


0.961


0.979


exp
0.957


0.952


0.975












Tyrosine (m/z 466, C1–9)









calc
0.379
0.429
0.166
0.304
0.437
0.212
0.240
0.442
0.262
exp
0.379
0.421
0.165
0.304
0.432
0.213
0.242
0.440
0.250










Tyrosine (m/z 302, C1–2)









calc
0.973


0.961


0.979


exp
0.972


0.964


0.966












Glutamate (m/z 432, C1–5)









calc
0.352
0.427
0.184
0.278
0.431
0.233
0.276
0.458
0.230
exp
0.353
0.429
0.184
0.278
0.432
0.233
0.279
0.467
0.228

a Calculated values predicted by the solution of the mathematical model corresponding to the optimized set of fluxes

b Experimental values obtained by GC-MS analysis of TBDMS-derivatized amino acids

Frick and Wittmann Microbial Cell Factories 2005 4:30   doi:10.1186/1475-2859-4-30