In dark-grown or etiolated plants, phytochrome is present in a red light–absorbing form, referred to as Pr. Pr, which to the human eye is blue, is converted by red light to a far-red light–absorbing form called Pfr, which is blue-green. 

TLS Online TPP Program

#Id: 9477

#XL - T Zoology

All SOCS proteins contains:

SH2 domain

SOCS box

TLS Online TPP Program

#Id: 9478

#XL - T Zoology

SOCS box, 

Recruits E3 ubiquitin ligases that polyubiquitinylate the receptor and the JAK kinase & marks the proteins for destruction by a proteasome

TLS Online TPP Program

#Id: 9479

#XL - T Zoology

SOCS-1, binds to the critical phosphotyrosine in the activation loop of an activated JAK2 kinase, inhibiting its catalytic activity

TLS Online TPP Program

#Id: 9481

#XL - T Zoology

TLS Online TPP Program

#Id: 9608

#XL - T Zoology

For most, but not all, RTKs, the weakly active kinase in each subunit is phosphorylate a key tyrosine in the activation loop of the other subunit (trans-phosphorylation)

TLS Online TPP Program

#Id: 9609

#XL - T Zoology

Phosphorylation leads to a conformational change in the activation loop that unblocks kinase active site by reducing the Kd for ATP or the substrate to be phosphorylated.