Signal sequences

contain one or more positively charged amino acids adjacent to a continuous stretch of 6–12 hydrophobic residues (known as the hydrophobic core)

TLS Online TPP Program

#Id: 8154

#Section 3: Genetics, Cellular and Molecular Biology

Sar1 GTPase drives the pinching off of COPII vesicles

ARF GTPase drives the pinching off of COPIvesicles

Dynamin GTPase drives the pinching off of clathrin-coated vesicles

TLS Online TPP Program

#Id: 8153

#Section 3: Genetics, Cellular and Molecular Biology

A second function of small GTPases in vesicle formation is in the pinching off of a completed vesicle from the parent membrane

TLS Online TPP Program

#Id: 8152

#Section 3: Genetics, Cellular and Molecular Biology

After the vesicle coat is complete, the Sec23 coat subunit promotes GTP hydrolysis causes disassembly of the coat.

TLS Online TPP Program

#Id: 8151

#Section 3: Genetics, Cellular and Molecular Biology

Sec12

acts as a GEF factor for Sar1

TLS Online TPP Program

#Id: 8150

#Section 3: Genetics, Cellular and Molecular Biology

Sar1 is the only GTPase switch protein activated at the ER membrane

TLS Online TPP Program

#Id: 8149

#Section 3: Genetics, Cellular and Molecular Biology

ARF and Sar1 similar to Ras