Magic Angle Spinning Nuclear Magnetic Resonance of the chlorosomes
| Autor: | Boer, I. de, Groot, H.J.M. de, Grimm, B., Porra, R.J., Rüdiger, W., Scheer, H. |
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| Přispěvatelé: | Grimm, B., Porra, R.J., Rüdiger, W., Scheer, H. |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Advances in Photosynthesis and Respiration ISBN: 9781402045158 Advances in Photosynthesis and Respiration, 297-307. Dordrecht: Springer ISSUE=25;STARTPAGE=297;ENDPAGE=307;TITLE=Advances in Photosynthesis and Respiration |
| DOI: | 10.1007/1-4020-4516-6_20 |
| Popis: | Summary Chlorosomes, the oblong light-harvesting bodies of green photosynthetic bacteria, are attached to the inner side of the cytoplasmic membrane. Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) was used to study isotopically labeled chlorosomes and in vitro model compounds. Using uniform isotope labeling of chlorophyll molecules, 2D and 3D MAS NMR dipolar correlation spectroscopy was performed in high magnetic fi eld. The chemical shifts provided invaluable information about the structure via ring current effects, while long range correlations were generated that lead to intermolecular distance constraints. Novel methodology was developed and implemented using a Chl a/H2O aggregate, and a structural arrangement of bilayers of Chl sheets with interdigitating tails was resolved. Application of this technology to chlorosomes and BChl c aggregates provided unambiguous evidence that self-organization of BChl c is the principal structural factor in establishing the rod elements in chlorosomes. This confi rms that proteins do not play an essential role in the light harvesting function, which is of fundamental biological interest. Finally, MAS NMR leads to a bilayer model for the tubular supra-structure of sheets of BChl c in the chlorosomes of Chlorobium tepidum. |
| Databáze: | OpenAIRE |
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