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TLS Online TPP Program

#Id: 8395


Sarcomere
Within each skeletal muscle cell are many myofibrils consisting of a repeating array of a specialized structure

#XL - Q Biochemistry #Myosin & Muscle Contraction #Part B Pointers
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TLS Online TPP Program

#Id: 9810

#XL - R Botany

Pfr is the physiologically active forms of Phytochrome
Wild type: short hypocotyl by white light
hy mutant (phytochrome mutant): long hypocotyl by white light

TLS Online TPP Program

#Id: 9811

#XL - R Botany

A toggle model is for phytochrome interconversion
The structure of the b-hairpin region of Pr is changed to an a helix during the conversion of Pr to Pfr, which initiates other conformational changes in the protein.

TLS Online TPP Program

#Id: 9812

#XL - R Botany

There are five phytochrome isoforms in angiosperms


TLS Online TPP Program

#Id: 9813

#XL - R Botany

PHYA is the only gene that encodes a Type I phytochrome and predominantly perceives far-red light.
Phytochrome B predominantly perceives red light

TLS Online TPP Program

#Id: 9814

#XL - R Botany

The PHYA gene is transcriptionally active in dark-grown seedlings, but its expression is strongly inhibited in the light in monocots.

TLS Online TPP Program

#Id: 9815

#XL - R Botany

The PRD domain of phyB serve as an NLS. 
Conversion of Pr to Pfr by red light expose the functional NLS of the PRD domain of phyB, facilitating phyB’s import into the nucleus.

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