What is the photoactive yellow protein structure?
Photoactive Yellow Protein. Researchers use synchrotrons and X-ray lasers to reveal the rapid processes of light sensing. This structure of photoactive yellow protein, solved by time-resolved Laue crystallography, includes a 50-50 mixture of the ground state (top) and the light-activated state (bottom).
Is the isolated chromophore responsible for transduction of photoactive yellow protein?
The cycle of the photoactive yellow protein (PYP) has been extensively studied, but the dynamics of the isolated chromophore responsible for transduction is unknown.
Does photoactive yellow protein (PYP) control blue light-induced negative phototaxis in eubacteria?
Several eubacteria contain photoactive yellow protein (PYP), a PAS family [21] photosensor that responds to blue light via isomerization of its covalently linked p -coumaric acid chromophore about a double bond ( Figure 2 ). In the eubacterium Halorhodospira halophila, PYP has been suggested to control blue-light-induced negative phototaxis [ 29 ].
What does PYP‐phytochrome stand for?
Carl E. Bauer, in Methods in Enzymology, 2007 PYP‐phytochrome (Ppr) is a unique photoreceptor that contains a blue light‐absorbing photoactive yellow protein (PYP) domain, a red light‐absorbing phytochrome domain, and a histidine kinase domain.
What is the structure of photosensory protein?
PYP is a highly soluble globular protein with an alpha/beta fold structure. It is a member of the PAS domain superfamily, which also contains a variety of other kinds of photosensory proteins.
What can we learn from structural studies of photosensitive proteins?
These structural studies have provided insight into photosensitive proteins, e.g. the role of hydrogen bonding, molecular isomerization and photoactivity.
What is the wavelength of light absorbed during the photoreactive mechanism?
During the photoreactive mechanism: Light absorption yields the native protein to absorb a maximum wavelength of 446 nm, ε = 45500 M −1 cm −1. Within a nanosecond the absorbed maximum wavelength is shifted to 465 nm. Then on a sub-millisecond timescale is excited to a 355 nm state.