Fe protein 

contains 2 identical subunits (dimer) – nif H

Each subunit has MW of 30 ~ 72 kD.

Each subunit contains an Fe-S cluster (4Fe and 4S2-).

TLS Online TPP Program

#Id: 9269

#XL - Q Biochemistry

Fe protein 

contains 2 identical subunits (dimer) – nif H

Each subunit has MW of 30 ~ 72 kD.

Each subunit contains an Fe-S cluster (4Fe and 4S2-).

TLS Online TPP Program

#Id: 9269

#XL - S Microbiology

Fe protein 

contains 2 identical subunits (dimer) – nif H

Each subunit has MW of 30 ~ 72 kD.

Each subunit contains an Fe-S cluster (4Fe and 4S2-).

TLS Online TPP Program

#Id: 9801

#XL - R Botany

Very small amount of far-red light absorbed by Pr makes it impossible to convert Pfr entirely to Pr by broad spectrum far-red light. An equilibrium of 97% Pr and 3% Pfr is achieved. This equilibrium is termed the photostationary state.

TLS Online TPP Program

#Id: 9802

#XL - R Botany

TLS Online TPP Program

#Id: 9803

#XL - R Botany

The N-terminal a PAS domain 

a GAF domain with bilin-lyase activity, which binds the chromophore, 

PHY domain, which stabilizes phytochrome in the Pfr form

TLS Online TPP Program

#Id: 9804

#XL - R Botany

PAS-related domain (PRD) repeats mediate phytochrome dimerization. 

The PRD domain targets the Pfr form of phyB to the nucleus, although it lacks a canonical nuclear localization signal (NLS).

TLS Online TPP Program

#Id: 9805

#XL - R Botany

In higher plants the phytochrome chromophore is a linear tetrapyrrole called phytochromobilin

TLS Online TPP Program

#Id: 9806

#XL - R Botany

Pr chromophore undergoes a cis–trans isomerization between carbons 15 and 16 and rotation of the C14-C15 single bond on red light exposure.