Difference between revisions of "Part:BBa K1471006"

Revision as of 18:13, 30 October 2014

RBS with PhyB.

RBS for yeast and a light receptor named phytochrome B.

Phytochrome B is a photoreceptor protein which belongs to a multigenetic family that goes from Phy A to Phy E, every one of this genes is involved in a different function in the plant. wThis light-receptor protein is stimulated mostly for red light and far red-light in the spectrum at 700-800nm. Phytochrom B has the ability to absorb the red light in order to be able to absorb the far red light, this happens due to a conformation change in the protein which goes back to its initial state once it absorbs the far red light. The previous conformations are known as Pr which is able to absorb the red light and pfr that absorbs the far red light. Phytochrome B is known to be involved in the seeds germination under certain light conditions, in fact mutants with absence of Phy B does not germinate in the same proportion as the wild type, 80% of the seeds tried to be germinated in absence of light did not show any results.

Figure no. 1

In the figure no. 1 its shown the action of the protein under different red light emissions, Where the normal conformation of the protein is change by the red-light emission at 660 nm and then is able to absorb the far red-light and also interact with a specific molecule called phytochrome interacting factor 6 or "pif6" which acts as a signal transmitter from the Phytochrome B to other systems.

In the previous figure no. 2 is shown how the Phy B acts under the constant stimulation of red-light and far red-light, also the action of Phy A under constant light exposure and with low light exposure.

Phytochrome B is known to have a crucial role for plants growing under low exposition to light, also its conformations have a duo regulative action which the pfr conformation. When red-light is absorbed the phytochrome turns into the Pfr conformation which gains the ability to absorb the far red-light and come back to the original conformation Pr.

Phytochrome B mutant lack of chlorophyll molecules, coding genes for proteins involved in the development of chloroplasts and alters the plant capacity for responding to certain vegetal hormones. Also it affects the response ability to red light, the other phytochrome in the plants can´t fulfill the entire function of absorbing red light and white light.

Sequence and Features