the balancing act. redox poise and signalling the drummond lecture
DESCRIPTION
The balancing act. Redox poise and signalling The Drummond lecture Queen Mary, University of London http://plantcell.lu.se/balancing. New Zealand - PowerPoint PPT PresentationTRANSCRIPT
The balancing act. Redox poise and signalling
The Drummond lectureQueen Mary, University of London
http://plantcell.lu.se/balancing
New Zealand
Dr Muriel Emma Bell (CBE) was awarded the William Gibson Research Scholarship for Medical Women of the British Empire by the Royal Society of Medicine. This enabled her to work for three years with Professor Jack Drummond at University College, London.
Australia
Australian Academy of Science. Victor Martin Trikojus 1902-1985 went to London, where Trik spent some months with Professor Jack Drummond at University College. This gave him the opportunity of extending his contacts with endocrinologists, as well as getting to know one of the great figures in British nutrition.
Wales….
David Hughes, the first Professor and Head of Department of Microbiology at Cardiff (1964-1982) brought back happy memories of the golden past. He also brought the house down with his story of Sir Jack Drummond who coated a haddock with yellow phosphorus to demonstrate to medical students, its "bioluminescence". Trouble was his hands glowed in the darkened lecture theatre more strongly than the fish!
David Lloyd, Biotype. The Newsletter of the School of Pure & Applied Biology, University of Wales Cardiff. Volume 6 Issue 2 April 1996
Acknowledgements
Lund University Plant Cell Biology-Plant Biochemistry http://plantcell.lu.se
Thomas Pfannschmidt (Now University of Jena, Germany)
Dalibor Stys (Now S. Bohemia University, Czech Republic)
Anders Nilsson (Now Bruker Spectroscopy, Lund)
Sylvan Dubé (Now Laval University, Canada)
Paul Davison (Now Sheffield University, U.K.)
H. Louise Race (Now Aylesbury, U.K.)
Jens Forsberg
Jörgen Ström
Boaz Laadan
Carol Allen
Collaborations
Torbjörn Drakenberg, Sture Forsén (Lund Physical Chemistry 2)
Gerhard Link (University of Bochum, Germany)
Light 2
Light 1
The balancing act1.
Transients, enhancement, and redox poise of cyclic electron flow.
Rates and activities of components.
Myers, J. (1971) Annu. Rev.Plant Physiol. 22, 289-312
Hill, R. (1965) Essays Biochem. 1, 121-151
Park, R. B. and Sane, P.V. (1971) Annu. Rev. Plant Physiol.22, 395-430
NADP + H+ +
NADPH
ATPADP + Pi
2H + 1/2O2+
2e-P680
PhQ
AQ
B
PQPQH2
H2O
FeSCyt f
e-PC
P700A0
A1
FeS
4H+
4H+
Cyt b6
Cyt b62e- e-2H
+ 2H+
4H+
STROMA
LUMEN
FNRFd
Photosynthesis
Blankenship, R. E. (2002) Molecular Mechanisms of Photosynthesis. Blackwell Science, Oxford
Heathcote, P. et el. (2002) Trends Biochem. Sci. 27, 79-87
Forsberg, J. (2002) PhD thesis. Lund University
Pfannschmidt, T. et al. (1999) IUBMB Life 48, 271-276
The balancing act2.
Protein phosphorylation and state transitions. Post-translational
modification of the structure and function of proteins you already
have.
Allen, J. F. (1992) BBA 1098, 275-225 . Adapted from Allen, J.F. et al. (1981) Nature 291, 25-29
Time (s)
12
3
A B
C
D E F G H
Fi
Dubé, S., Davison, P.A. and Allen, J. F. (unpublished)
State 1State 2
P
P
P
P
P
State 1State 2
Allen, J. F. and Forsberg, J. (2001) Trends Plant Sci.6, 317-326
HP
P
H
P
Nilsson, A. et al. (1997) JBC 272, 18350-18357
The balancing act3.
Redox control of gene expression. Changing transcription and the stoichiometry of complexes.
Allen, J. F. (1992) BBA 1098, 275-225
Pfannschmidt, T. et al. (1999) IUBMB Life 48, 271-276
The balancing act4.
Redox signalling and evolution.Why chloroplasts (and
mitochondria…) have genomes
cpDNA-encoded in all sequenced genomes of photosynthetic plastids
cpDNA-encoded in at least one sequenced plastid genome
Cytochrome b6/f Photosystem IPhotosystem II
A
B
Race, H. L., Herrmann, R. G. and Martin, W. (1999) Trends Genet. 15, 364-370
Allen, J. F. (1993) J. Theor. Biol. 165, 609-631
GENE PROTEIN STANDARD REDOX POTENTIAL, Em7 (mV)
SUBSTRATE
Photosystem II
psbA D1 of PS II reaction centre
+1,170 (P+/P) -800 (P/P*)
Light
psbD D2 of PS II reaction centre
+1,170 (P+/P) -800 (P/P*)
Light
psbB, psbC CP47 and CP43of PS II
- Light
Energy coupling
petA Cytochrome f +350 Pmf (pH)
petB Cytochrome b6 -50 Pmf (pH)
atpA,B,E ATP synthase CF1,,
pH, ATP
atpF,H,I ATP synthase CFoI,III,IV
- pH, ATP
Photosystem I
psaA A1 of PS I reaction centre
-1,250 (P/P*) +500 (P+/P)
Light
psaB A2 of PS I reaction centre
-1,250 (P/P*) +500 (P+/P)
Light
Respiration; cyclic electron transport
ndhA-F NADH dehydrogenase subunits 1-5
-324 Respiratory substrates?
CO2 fixation
rbcL Rubisco large subunit
- Carbon dioxide
Chloroplast genes and gene products
Allen, J. F. (1993) J. Theor. Biol. 165, 609-631
The balancing act. Redox poise and signalling
• Transients, enhancement, and redox poise of cyclic electron flow.
• Protein phosphorylation and state transitions.
• Redox control of gene expression.• Redox signalling and evolution.
Quinone pools: Why is redox poise maintained, apparently
by every possible means?
• Efficiency. Example - state transitions in oxygenic photosynthesis.
• Safety - minimizing single electron transfers to oxygen.
The balancing actPostscript.
The Q-cycle, quinone and superoxide anion radicals. The mitochondrial theory of ageing,
and the evolution of sex.
GENE PROTEIN STANDARD REDOX POTENTIAL, Em7 (mV)
SUBSTRATE
Electron transport
nad1-7 Seven subunits of NADH dehydrogenase
-324 Respiratory substrates
cox1-3 Cytochrome c oxidase subunits I, II and III
+815 Oxygen
Energy coupling
atp6 ATP synthase F1 subunit 6
- Proton motive force, ATP
cob Cytochrome b -50 Proton motive force
Allen, J. F. (1993) J. Theor. Biol. 165, 609-631Mitochondrial genes and gene products
QuickTime™ and aVideo decompressor
are needed to see this picture.
Crofts, A.R., et al. (1998) In Proceedings of the IXth. International Symposium on Phototrophic Prokaryotes, Vienna, (Peschek G., ed.)
ALLEN, J F (1996) J. Theor. Biol. 180, 135-140
Thank you for your attention
The balancing act. Redox poise and signalling
The Drummond lectureQueen Mary, University of London
http://plantcell.lu.se/balancing
ALLEN, J F (1996) J. Theor. Biol. 180, 135-140