Root Structure and Function

The structure of root to Perform three major function;

Absorbing water and minerals

Anchoring and supporting the plants

Storing food

TLS Online TPP Program

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#XL - T Zoology

RII exhibits constitutive kinase activity; means it is active even when not bound to TGF-β.

TLS Online TPP Program

#Id: 9352

#XL - T Zoology

RIII, also called β-glycan, is a cell-surface proteoglycan.

TLS Online TPP Program

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#XL - T Zoology

The function of RIII for TGF-β receptors is similar to that of the α subunit of the IL-2 receptor 

(means facilitating TGF-β binding to the RII and RI)

   

         

TLS Online TPP Program

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#XL - T Zoology

Most cells lack RIII, TGF-β binds directly to the RII

dimer, but Active RII kinase activity is not sufficient to generate an intracellular signal

TLS Online TPP Program

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#XL - T Zoology

RI will not bind to RII unless RII is bound to TGF-β.

TLS Online TPP Program

#Id: 9357

#XL - T Zoology

RII phosphorylates serine and threonine in the juxtamembrane segment of the RI (ligand induced receptor hetero-oligomerization), releasing the inhibition of RI kinase activity.