Network Dynamics and Cell Physiology. John J. Tyson Dept. Biological Sciences Virginia Tech
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1 Network Dynamics and Cell hysiology John J. Tyson Dept. Biological Sciences Virginia Tech
2 Collaborators Budapest Univ. Techn.. & Econ. Bela Novak Attila Csikasz-Nagy Andrea Ciliberto Virginia Tech Kathy Chen Jill Sible
3 A little history 1970 s Belousov-Zhabotinsky BrO 3- +CH 2 (COOH) 2 Br - +CO 2 + Fe 2+ Fe 3+ BrCH(COOH)2 ½ C 6 H 12 O 6 Yeast Glycolysis NAD NADH C 3 H 4 O 3 C 3 H 6 O 3 Higgins, rigogine general principles of kinetics & thermo. Hess, Noyes specific mechanisms of oscillations
4 In this manner, the class of chemical switching networks will be promising candidates for a possible new technology of chemical reaction systems.
5 The Cell s Computer Hanahan & Weinberg (2000)
6 Wee1 TFB A Wee1 TFB I AC AC- Cdc25 Cdc25 Cdh1 TFI I Cdh1 TFI A Cyc E,A,B TFE A TFE I
7 Machine-readable form d[c ycb ] d t ' ( ) = k + k [T F B ] k + k [C d h 1] [C ycb ] k [C K I][C ycb ] ' synthesis degradation binding k [W ee1 ][C ycb ] + k [C dc25][c ycb ~ ] 4 5 phosphorylation dephosphorylation ' ( )( T ) d[c dc2 5] k k [C ycb ] [C dc25] [C dc25] k 7 [ ase][c dc2 5] = d t J + [C dc25] [C dc25] J + [C d c25] 6 T 7 activation inactivation
8 M-phase G1 G2 S-phase
9 Wee1 TFB A Wee1 TFB I AC AC- Cdc25 Cdc25 Network Motifs! Cdh1 TFI I Cdh1 TFI A Cyc E,A,B TFE A TFE I
10 Gene Expression S R rate (dr/dt) 5 rate of degradation S=3 S=2 S=1 response (R) 0.5 linear dr k S k R, d rate of synthesis R = 1 2 t = 1 ss k2 R k S signal (S) Signal-Response Curve
11 rotein hosphorylation R AT i Kinase AD R H 2 O hosphatase 0 rate (dr/dt) response (R) R 1 R Signal (Kinase) Buzzer Goldbeter & Koshland, 1981
12 rotein Synthesis: ositive Feedback S R rate (dr/dt) S=16 S=8 S=0 response (R) 0.5 Open E E 0.1 Closed R signal (S) Bistability Fuse Griffith, 1968
13 Coupled Buzzers S = R total R R E S=0.5 S=1 S=1.5 response (R) SN SN E E R signal (S) Bistability Toggle
14 response (MF) metaphase Frog egg 0 interphase signal (cyclin) S = Total Cyclin Wee1 MF = MF MF- (inactive) Cdc25 Cdc25-
15 MF activity depends on total cyclin concentration and on the history of the extract Cyclin concentration increasing MF activity nm cyclin B I M Cyclin concentration decreasing inactivation threshold at 90 min MF activity Wei Sha & Jill Sible (2003) nm cyclin B bistability
16 1 Oscillations MF 0.5 response (MF) 1 Hopf Hopf sss uss sss signal (rate of cyclin synthesis) cyclin synthesis Cdc AC MF Cdc25- cyclin cyclin degradation MF- (inactive)
17
18 If knock-out positive feedback loop, then oscillations become faster and smaller amplitude With + feedback Without + feedback Figure 4. omerening, Kim and Ferrell
19 Wee1 TFB A oscillator Wee1 TFB I AC AC- bistable switch Cdc25 Cdc25 Cdh1 bistable switch TFI I Cdh1 TFI A Cyc E,A,B bistable switch TFE A oscillator TFE I
20 Wee1 Wee1 Cdc25 Cdc25 TFB A TFB I AC AC- Cdh1 TFI I Cyc E,A,B TFE A Fission Yeast Cdh1 TFI A TFE I
21 !"
22 '$% $!"#$%& && '$% $ * ( %) * & +
23 !"
24 abscissa ordinate
25 !"!,$&-% '&.
26 Nature, Vol, 256, No. 5518, pp , August 14, 1975 Genetic control of cell size at cell division in yeast aul Nurse Department of Zoology, West Mains Road, Edinburgh EH9 3JT, UK wild-type wee1
27 Wee1 TFB A Wee1 TFB I AC AC- Cdc25 Cdc25 Cdh1 TFI I Cdh1 TFI A Cyc E,A,B TFE A TFE I
28 # $!%& '!&('#!" #!,$&-% '&/ ""$% %0&%
29 Wee1 TFB A Wee1 TFB I AC AC- Cdc25 Cdc25 Cdh1 TFI I Cdh1 TFI A Cyc E,A,B TFE A TFE I
30 )&!!!*!!
31 Wee1 TFB A Wee1 TFB I AC AC- Cdc25 Cdc25 Cdh1 TFI I Cdh1 TFI A Cyc E,A,B TFE A TFE I
32 $ "- #!&!(! #!! 12,$&-% '&/ (%.,!& +
33 ??
34 d T dt = k 1. M - (k 2 ' + k 2 ". Ste9 +k2'". Slp1 A ). T dste9 = k dt 3 '. 1 - Ste9 J Ste9 - (k 4'. SK + k. 4 ). Ste9 J 4 + Ste9 d Rum1 T dt = k 11 - (k 12 + k 12 '. SK + k 12 ". ). RUM1 T dslp1 A dt = k. 7 IE. Slp1 T - Slp1 A - k J 7 + Slp1 T - Slp1. Slp1 A 8 - k A J 8 + Slp1. 6 Slp1 A A? dm dt = µ. M?
35 Thanks to James S. McDonnell Found. DARA
36 References Tyson, Chen & Novak, Network dynamics and cell physiology, Nature Rev. Molec. Cell Biol. 2:908 (2001). Tyson, Csikasz-Nagy & Novak, The dynamics of cell cycle regulation, BioEssays 24:1095 (2002). Tyson, Chen & Novak, Sniffers, buzzers, toggles and blinkers, Curr. Opin. Cell Biol. 15:221 (2003).
37 "!! DNA mrna rotein TACCCGATGGCGAAATGC... AUGGGCUACCGCUUUACG... Met -Gly -Tyr -Arg -he -Thr... Enzyme AT - AD Reaction Network Cell hysiology E 1 E X Y 3 E 4 Z E 2.!!"
38 )&/ "!- & & "!
39 )&/ "!- &!1*! 2! d T dt = k 1. M - (k 2 ' + k 2 ". Ste9 +k2'". Slp1 A ). T dste9 = k dt 3 '. 1 - Ste9 J Ste9 - (k 4'. SK + k. 4 ). Ste9 J 4 + Ste9 d Rum1 T = k dt 11 - (k 12 + k 12 '. SK + k 12 ". ). RUM1 T dslp1 A = k dt. 7 IE. Slp1 T - Slp1 A - k J 7 + Slp1 T - Slp1. Slp1 A 8 - k A J 8 + Slp1. 6 Slp1 A A dm dt = µ. M!$ 3!!! & "!
40 Machine-readable form d[c yca ] d t = k + k [E 2F] k [C yca ] k [C K I][C yca ] ' synthesis degradation binding d[c ycb ] d t ' ( ) = k + k [T F B ] k + k [C d h 1] [C ycb ] k [C K I][C ycb ] ' synthesis degradation binding ' ' ( k 6 + k 6 )( T ) ( k 7 + k 7 ) d[c dh1] [C dc20] [C dh1] [C dh1] [C lb5] [C dh1] = d t J + [C dh1] [C d h1] J + [C dh1] 6 T 7 activation inactivation
41 Change parameters S R rate (dr/dt) S=16 S=8 S=0 response (R) SN SN E E R signal (S) Toggle Griffith, 1968
nutrients growth & division repellants movement
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