PHYS 25 |
| We used femto-second time resolved transient absorbance difference spectroscopy to investigate the membrane protein of a light-harvesting antenna complex (LH2) from photosynthetic bacteria Rb. sphaeroides 2.4.1, which consists of two concentric polypeptide cylinders and ringlike pigment aggregate (B850). The deformation of the protein was induced by self-assembly of LH2 onto nanoparticles of different size. The results show that when size of the nanoparticle approaches the diameter of either the inner or the outer polypeptide cylinder, it would induce a largest protein deformation, giving rise to a shorter excited-state life time of B850. This provides a quantitative example of size-matching interaction between the protein and the nanopartilces. |
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Optical Probes of Dynamics in Complex Environments
8:00 AM-12:00 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 344, Oral
Division of Physical Chemistry |