In Meristematic zone, 

cells divide both in the direction of the root base to form cells that will differentiate into the tissues of the functional root and in the direction of the root apex to form the root cap

TLS Online TPP Program

#Id: 8158

#XL - Q Biochemistry

Soluble ER-resident proteins contain C-terminal KDEL sorting signal that allows them to be retrieved. 

TLS Online TPP Program

#Id: 8159

#XL - Q Biochemistry

KDEL receptor, located mainly in the cis-Golgi network and in both COPII and COPI vesicles, binds proteins bearing the KDEL sorting signal and returns them to the ER

TLS Online TPP Program

#Id: 8160

#XL - Q Biochemistry

The KDEL receptor and other membrane proteins that

are transported Golgi to ER contain 

Lys-Lys-X-X sequence at C-terminal

TLS Online TPP Program

#Id: 8161

#XL - Q Biochemistry

KKXX sorting signal,

binds to a complex of the COPI α and β subunits

TLS Online TPP Program

#Id: 8162

#XL - Q Biochemistry

For selective export of certain membrane proteins from the ER contain a di-acidic sorting signal (Asp-X-Glu, or DXE), which binds to the Sec24 subunit of the COPII

TLS Online TPP Program

#Id: 8163

#XL - Q Biochemistry

Vesicles coated with AP1 and clathrin bind to  proteins containing a Tyr-X-X-Φ sequence