Chromophore conformation and the evolution of tertiary structural changes in photoactive yellow protein.

Journal Article

We use time-resolved crystallography to observe the structural progression of a bacterial blue light photoreceptor throughout its photocycle. Data were collected from 10 ns to 100 ms after photoactivation of the E46Q mutant of photoactive yellow protein. Refinement of transient chromophore conformations shows that the spectroscopically distinct intermediates are formed via progressive disruption of the hydrogen bond network to the chromophore. Although structural change occurs within a few nanoseconds on and around the chromophore, it takes milliseconds for a distinct pattern of tertiary structural change to fully progress through the entire molecule, thus generating the putative signaling state. Remarkably, the coupling between the chromophore conformation and the tertiary structure of this small protein is not tight: there are leads and lags between changes in the conformation of the chromophore and the protein tertiary structure.

Full Text

Duke Authors

Cited Authors

  • Anderson, S; Srajer, V; Pahl, R; Rajagopal, S; Schotte, F; Anfinrud, P; Wulff, M; Moffat, K

Published Date

  • June 2004

Published In

Volume / Issue

  • 12 / 6

Start / End Page

  • 1039 - 1045

PubMed ID

  • 15274923

Electronic International Standard Serial Number (EISSN)

  • 1878-4186

International Standard Serial Number (ISSN)

  • 0969-2126

Digital Object Identifier (DOI)

  • 10.1016/j.str.2004.04.008

Language

  • eng