Conformational changes in an ultrafast light-driven enzyme determine catalytic activity

The role of conformational changes in explaining the huge catalytic power of enzymes is currently one of the most challenging questions in biology. Although it is now widely regarded that enzymes modulate reaction rates by means of short- and long-range protein motions, it is almost impossible to di...

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Published inNature (London) Vol. 456; no. 7224; pp. 1001 - 1004
Main Authors Sytina, Olga A, van Stokkum, Ivo H. M, Alexandre, Maxime T, Groot, Marie Louise, Hunter, C. Neil, Heyes, Derren J, van Grondelle, Rienk
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 18.12.2008
Nature Publishing Group
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Abstract The role of conformational changes in explaining the huge catalytic power of enzymes is currently one of the most challenging questions in biology. Although it is now widely regarded that enzymes modulate reaction rates by means of short- and long-range protein motions, it is almost impossible to distinguish between conformational changes and catalysis. We have solved this problem using the chlorophyll biosynthetic enzyme NADPH:protochlorophyllide (Pchlide) oxidoreductase, which catalyses a unique light-driven reaction involving hydride and proton transfers. Here we report that prior excitation of the enzyme-substrate complex with a laser pulse induces a more favourable conformation of the active site, enabling the coupled hydride and proton transfer reactions to occur. This effect, which is triggered during the Pchlide excited-state lifetime and persists on a long timescale, switches the enzyme into an active state characterized by a high rate and quantum yield of formation of a catalytic intermediate. The corresponding spectral changes in the mid-infrared following the absorption of one photon reveal significant conformational changes in the enzyme, illustrating the importance of flexibility and dynamics in the structure of enzymes for their function.
AbstractList The role of conformational changes in explaining the huge catalytic power of enzymes is currently one of the most challenging questions in biology. Although it is now widely regarded that enzymes modulate reaction rates by means of short- and long-range protein motions, it is almost impossible to distinguish between conformational changes and catalysis. We have solved this problem using the chlorophyll biosynthetic enzyme NADPH:protochlorophyllide (Pchlide) oxidoreductase, which catalyses a unique light-driven reaction involving hydride and proton transfers. Here we report that prior excitation of the enzyme-substrate complex with a laser pulse induces a more favourable conformation of the active site, enabling the coupled hydride and proton transfer reactions to occur. This effect, which is triggered during the Pchlide excited-state lifetime and persists on a long timescale, switches the enzyme into an active state characterized by a high rate and quantum yield of formation of a catalytic intermediate. The corresponding spectral changes in the mid-infrared following the absorption of one photon reveal significant conformational changes in the enzyme, illustrating the importance of flexibility and dynamics in the structure of enzymes for their function. [PUBLICATION ABSTRACT]
The role of conformational changes in explaining the huge catalytic power of enzymes is currently one of the most challenging questions in biology. Although it is now widely regarded that enzymes modulate reaction rates by means of short- and long-range protein motions, it is almost impossible to distinguish between conformational changes and catalysis. We have solved this problem using the chlorophyll biosynthetic enzyme NADPH:protochlorophyllide (Pchlide) oxidoreductase, which catalyses a unique light-driven reaction involving hydride and proton transfers. Here we report that prior excitation of the enzyme-substrate complex with a laser pulse induces a more favourable conformation of the active site, enabling the coupled hydride and proton transfer reactions to occur. This effect, which is triggered during the Pchlide excited-state lifetime and persists on a long timescale, switches the enzyme into an active state characterized by a high rate and quantum yield of formation of a catalytic intermediate. The corresponding spectral changes in the mid-infrared following the absorption of one photon reveal significant conformational changes in the enzyme, illustrating the importance of flexibility and dynamics in the structure of enzymes for their function.
Enzyme catalysis: major contribution from conformational change (Hunter JF) Conformational changes involving short- and long-range protein motions contribute to the remarkable catalytic power of enzymes, but the extent of their contribution has been difficult to quantify. Sytina et al . have examined the chlorophyll biosynthetic enzyme NADPH:protochlorophyllide-oxidoreductase, which catalyses a light-driven reaction involving hydride and proton transfers. They show that prior excitation of the enzyme-substrate complex with a laser pulse induces a more favourable conformation of the active site and increases the catalytic efficiency of the coupled hydride and proton transfer reactions. Spectral changes in the mid-infrared following the absorption of one photon reveal significant conformational changes in the enzyme, illustrating the importance of flexibility and dynamics in the structure of enzymes for their function. The chlorophyll biosynthetic enzyme NADPH:protochlorophyllide oxidoreductase, which catalyses a light-driven reaction involving hydride and proton transfers is examined. It is determined that prior excitation of the enzyme–substrate complex with a laser pulse induces a more favourable conformation of the active site and increases the catalytic efficiency of the coupled hydride and proton transfer reactions. Spectral changes in the mid-infrared after the absorption of one photon reveal significant conformational changes in the enzyme. The role of conformational changes in explaining the huge catalytic power of enzymes is currently one of the most challenging questions in biology 1 , 2 , 3 , 4 , 5 , 6 , 7 . Although it is now widely regarded that enzymes modulate reaction rates by means of short- and long-range protein motions 3 , 4 , 5 , 6 , 7 , it is almost impossible to distinguish between conformational changes and catalysis. We have solved this problem using the chlorophyll biosynthetic enzyme NADPH:protochlorophyllide (Pchlide) oxidoreductase, which catalyses a unique light-driven reaction involving hydride and proton transfers 8 . Here we report that prior excitation of the enzyme-substrate complex with a laser pulse induces a more favourable conformation of the active site, enabling the coupled hydride and proton transfer reactions to occur. This effect, which is triggered during the Pchlide excited-state lifetime and persists on a long timescale, switches the enzyme into an active state characterized by a high rate and quantum yield of formation of a catalytic intermediate. The corresponding spectral changes in the mid-infrared following the absorption of one photon reveal significant conformational changes in the enzyme, illustrating the importance of flexibility and dynamics in the structure of enzymes for their function.
Audience Academic
Author Sytina, Olga A
van Stokkum, Ivo H. M
Hunter, C. Neil
Heyes, Derren J
Alexandre, Maxime T
Groot, Marie Louise
van Grondelle, Rienk
Author_xml – givenname: Olga A
  surname: Sytina
  fullname: Sytina, Olga A
  organization: Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit
– givenname: Ivo H. M
  surname: van Stokkum
  fullname: van Stokkum, Ivo H. M
  organization: Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit
– givenname: Maxime T
  surname: Alexandre
  fullname: Alexandre, Maxime T
  organization: Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit
– givenname: Marie Louise
  surname: Groot
  fullname: Groot, Marie Louise
  organization: Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit
– givenname: C. Neil
  surname: Hunter
  fullname: Hunter, C. Neil
  organization: Department of Molecular Biology and Biotechnology, University of Sheffield
– givenname: Derren J
  surname: Heyes
  fullname: Heyes, Derren J
  organization: Manchester Interdisciplinary Biocentre, University of Manchester
– givenname: Rienk
  surname: van Grondelle
  fullname: van Grondelle, Rienk
  organization: Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit
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IsPeerReviewed true
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Issue 7224
Keywords Chlorophyll
Protochlorophyllide reductase
Enzyme
Light
Biosynthesis
Oxidoreductases
Catalyst activity
Conformation
Language English
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Snippet The role of conformational changes in explaining the huge catalytic power of enzymes is currently one of the most challenging questions in biology. Although it...
Enzyme catalysis: major contribution from conformational change (Hunter JF) Conformational changes involving short- and long-range protein motions contribute...
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SubjectTerms Analytical, structural and metabolic biochemistry
Biocatalysis - radiation effects
Biological and medical sciences
Catalysis
Catalytic Domain - radiation effects
Changes
Enzymes
Enzymes and enzyme inhibitors
Fundamental and applied biological sciences. Psychology
Humanities and Social Sciences
letter
Light
Models, Molecular
multidisciplinary
Oxidoreductases
Oxidoreductases Acting on CH-CH Group Donors - chemistry
Oxidoreductases Acting on CH-CH Group Donors - metabolism
Oxidoreductases Acting on CH-CH Group Donors - radiation effects
Protein Conformation - radiation effects
Protons
Science
Science (multidisciplinary)
Structure-Activity Relationship
Synechocystis - enzymology
Time Factors
Title Conformational changes in an ultrafast light-driven enzyme determine catalytic activity
URI http://dx.doi.org/10.1038/nature07354
https://link.springer.com/article/10.1038/nature07354
https://www.ncbi.nlm.nih.gov/pubmed/19092933
https://www.proquest.com/docview/204461807
https://search.proquest.com/docview/69911109
Volume 456
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