Abstract
The structure of a rate-limited product complex formed during a single initial round of turnover by isocitrate dehydrogenase has been determined. Photolytic liberation of either caged substrate or caged cofactor and Laue X-ray data collection were used to visualize the complex, which has a minimum half-life of approximately 10 milliseconds. The experiment was conducted with three different photoreactive compounds, each possessing a unique mechanism leading to the formation of the enzyme–substrate (ES) complex. Photoreaction efficiency and subsequent substrate affinities and binding rates in the crystal are critical parameters for these experiments. The structure suggests that CO2 dissociation is a rapid event that may help drive product formation, and that small conformational changes may contribute to slow product release .
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 12 print issues and online access
$189.00 per year
only $15.75 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
References
Moffat, K. Laue Diffraction. Meth. Enz. 277, 433– 447 (1997).
Stoddard, B. L. Caught in a chemical trap. Nature Struct. Biol. 3, 907–909 (1996).
Stoddard, B. L. Intermediate trapping and Laue X-ray diffraction: potential for enzyme mechanism, dynamics, and inhibitor screening. Pharmacol. Thera. 70, 215–256 (1996).
Moffat, K. & Ren, Z. Synchrotron radiation applications to macromolecular crystallography. Curr. Opin. Struct. Biol. 7, 689–696 (1997).
Perman, B., et al. Energy transduction on the nanosecond time scale: early structural events in a xanthopsin photocycle. Science 279, 1946–1950 (1998).
Szebenyi, D. M. E. et al. Quantitative analysis of Laue diffraction patterns recorded with a 120 picosecond exposure from an X-ray undulator. Trans. Am. Crystall. 24, 167–172 (1988).
Srajer,V. et al. Photolysis of the carbon monoxide complex of myoglobin: nanosecond time-resolved crystallography. Science 274, 1726–1729 (1996).
Genick, U. K. et al. Structure of a protein photocycle intermediate by millisecond time-resolved crystallography. Science 275, 1471–1475 (1997).
Teng, T. Y., Srajer,V. & Moffat, K. Initial trajectory of carbon monoxide after photodissociation from myoglobin at cryogenic temperatures. Biochemistry 36, 12087–12100 (1997).
Farber, G. K. Laue crystallography: Lights! Camera! Action! Curr. Biol. 7, R352–R354 (1997).
Imamoto, Y., Kataoka, M. & Tokunaga, F. Photoreaction cycle of photoactive yellow protein from Ectothiorhodospira halophila studied by low-temperature spectroscopy. Biochemistry 35, 14047–14053 (1996).
Ng, K., Getzoff, E. D. & Moffat, K. Optical studies of a bacterial photoreceptor protein, photoactive yellow protein, in single crystals. Biochemistry 34, 879–889 (1995).
Teng, T.-Y., Srajer,V. & Moffat, K. Photolysis-induced structural changes in single crystals of carbonmonoxy myoglobin at 40 K. Nature Struct. Biol. 1, 701–705 (1994).
Genick, U. K., Soltis, S. M., Kuhn, P., Canestrelli, I. L. & Getzoff, E. D. Structure at 0.85 Å resolution of an early protein photocycle intermediate. Nature 392, 206–209 (1998).
Schlichting, I., Berendzen, J., Phillips, G. N. P. Jr. & Sweet, R. M. Crystal structure of photolysed carbonmonoxy-myoglobin . Nature 371, 808–812 (1994).
Schlichting, I. & Goody, R. S. Triggering methods in crystallographic enzyme kinetics. Meth. Enz. 277 , 467–490 (1997).
Corrie, J. E. T., Katayama, Y., Reid, G. P., Anson, M. & Trentham, D. R. The development and application of photosensitive caged compounds to aid time-resolved structure determination of macromolecules. Phil. Trans. R. Soc. Lond. A 340 , 233–244 (1992).
Stoddard, B. L., Koenigs, P., Porter, N., Petratos, K., Petsko, G. A. & Ringe, D. Observation of the light-triggered binding of pyrone to chymotrypsin by Laue X-ray crystallography. Proc. Natl. Acad. Sci. USA 88 , 5503–5507 (1991).
Schlichting, I. et al. Time-resolved X-ray crystallographic study of the conformational change in Ha-Ras p21 protein on GTP hydrolysis. Nature 345, 309–315 (1990).
Singer, P. T., Smalas, A., Carty, R. P., Mangel, W. F. & Sweet, R. M. The hydrolytic water molecule in trypsin, revealed by time-resolved Laue crystallography. Science 259, 669–673 (1993).
Duke, E. M. H., Wakatsuki, W., Hadfield, A. & Johnson, L. N. Laue and monochromatic diffraction studies on catalysis in phosphorylase b crystals. Prot. Sci. 3, 1178– 1196 (1994).
Hajdu, J. et al. Catalysis in the crystal: synchrotron radiation studies with glycogen phosphorylase b. EMBO J. 6, 539 –546 (1987).
Stoddard, B. L. & Farber, G. K. Direct measurement of reactivity in the protein crystal by steady-state kinetic studies. Structure 3, 991–996 ( 1995).
Hurley, J. H. et al. Structure of a bacterial enzyme regulated by phosphorylation, isocitrate dehdyrogenase. Proc. Natl. Acad. Sci. USA 86, 8635–8639 (1989).
Hurley, J. H., Dean, A. M., Sohl, J. L., Koshland, D. E. & Stroud, R. M. Regulation of an enzyme by phosphorylation at the active site. Science 249, 1012– 1016 (1990).
Hurley, J. H., Dean, A. M., Thorsness, P. E., Koshland, K. E. & Stroud, R. M. Regulation of isocitrate dehydrogenase by phosphorylation involves no long-range conformational change in the free enzyme. J. Biol. Chem. 265, 3599– 3602 (1990).
Hurley, J. H., Dean, A. M., Koshland, D. E. & Stroud, R. M. Catalytic mechanism of NADP-dependent isocitrate dehydrogenase: implications from the structures of magnesium-isocitrate and NADP complexes. Biochemistry 30, 8671–8678 (1991).
Bolduc, J. M. et al. Mutagenesis and Laue structures of enzyme intermediates: isocitrate dehydrogenase. Science 268, 1312 –1318 (1995).
Stoddard, B. L., Dean, A. & Bash, P. A. Combining Laue diffraction and molecular dynamics to study enzyme intermediates. Nature Struct. Biol. 3, 590–595 (1996).
Mesecar, A. D., Stoddard, B. L. & D. E. Koshland, J. Orbital steering in the catalytic power of enzymes: small structural changes with large catalytic consequences. Science 277, 202–206 ( 1997).
Cohen, B. E., Stoddard, B. L. & D. E. Koshland, J. Caged NADP and NAD. Synthesis and characterization of functionally distinct caged compounds. Biochemistry 36, 9035–9044 (1997).
Brubaker, M. J., Dyer, D. H., Stoddard, B. & D. E. Koshland, J. Synthesis, kinetics, and structural studies of a photolabile caged isocitrate: a catalytic trigger for isocitrate dehydrogenase. Biochemistry 35, 2854–2864 ( 1996).
Dean, A. M. & Koshland, D. E. Kinetic mechanism of Escherichia coli isocitrate dehydrogenase. Biochemistry 32, 9302–9309 (1993).
Stoddard, B. L. & D. E. Koshland, J. Structure of isocitrate dehydrogenase with α-ketoglutarate at 2.7 Å resolution: conformational chances induced by decarboxylation of isocitrate. Biochemistry 32, 9317–9322 (1993).
Ottl, J., Gabriel, D. & Marriott, G. Preparation and Photoactivation Of Caged luorophores and Caged Proteins Using a New Class Of Heterobifunctional, Photocleavable Cross-Linking Reagents. Bioconjugate Chem. 9, 143-151 (1998).
Getzoff, E. D., et al. Laue diffraction protein crystallography at the National Synchrotron Light Source. Nuclear Instr. Meth. Phys. Res. B 79, 249–255 (1993).
Rapp, G. & Guth, K. A low cost high intensity flash device for photolysis experiments. Pflugers Arch (European J. of Phys.) 411, 200–203 ( 1988).
Clifton, I. J., Duke, E. M. H., Wakatsuki, S. & Ren, Z. Evaluation of Laue diffraction patterns. Meth. Enz. 277, 448–467 (1997).
Helliwell, J. R. et al. The recording and analysis of synchrotron X-radiation Laue diffraction photographs. J. Appl. Crystallogr. 22, 483–497 (1989).
Ren, Z., Ng, K., Borgstahl, G. E. O., Getzoff, E. D. & Moffat, K. Quantitative analysis of time-resolved Laue diffraction patterns. J. Appl. Crystallogr. 29 , 246–260 (1996).
Brünger, A. X-PLOR version 3.1: a system for X-ray crystallography and NMR (Yale Universuty Press, New Haven, Connecticut; 1992).
Brünger, A. Asessment of phase accuracy by cross validation: the free R value. Methods and applications. Acta Crystallogr. D 49, 24–36 (1993).
Acknowledgements
We thank W. Scott, J. Bolduc, D. Dyer, M. Holmes, R. Strong, and K. Zhang for advice and help with X-ray crystallography, R.M. Sweet, P. Singer, and G. Shea for assistance and technical support at NSLS Beamline X-26C (Brookhaven National Laboratories), D. Ringe and G. Petsko for extended use of their Xe flashlamp, and K. Moffat for extremely helpful advice and criticism at all stages of our time-resolved studies. B.L.S. is funded for this project by the NIH, DEK by the NSF and DOE.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Stoddard, B., Cohen, B., Brubaker, M. et al. Millisecond Laue structures of an enzyme–product complex using photocaged substrate analogs. Nat Struct Mol Biol 5, 891–897 (1998). https://doi.org/10.1038/2331
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/2331
This article is cited by
-
Temperature-jump solution X-ray scattering reveals distinct motions in a dynamic enzyme
Nature Chemistry (2019)
-
Enzyme intermediates captured “on the fly” by mix-and-inject serial crystallography
BMC Biology (2018)
-
Pink-beam serial crystallography
Nature Communications (2017)
-
Time-resolved crystallography for protein structure: the case of heme proteins
Rendiconti Lincei (2013)
-
Breaking up is easy with esters
Nature Structural Biology (1998)