BP

GO:0006897

endocytosis

A vesicle-mediated transport process in which cells take up external materials or membrane constituents by the invagination of a small region of the plasma membrane to form a new membrane-bounded vesicle.

NAS

BP

GO:0007165

signal transduction

The cellular process in which a signal is conveyed to trigger a change in the activity or state of a cell. Signal transduction begins with reception of a signal (e.g. a ligand binding to a receptor or receptor activation by a stimulus such as light), or for signal transduction in the absence of ligand, signal-withdrawal or the activity of a constitutively active receptor. Signal transduction ends with regulation of a downstream cellular process, e.g. regulation of transcription or regulation of a metabolic process. Signal transduction covers signaling from receptors located on the surface of the cell and signaling via molecules located within the cell. For signaling between cells, signal transduction is restricted to events at and within the receiving cell.

IEA

BP

GO:0043547

positive regulation of GTPase activity

Any process that activates or increases the activity of a GTPase.

IEA

CC

GO:0005769

early endosome

A membrane-bounded organelle that receives incoming material from primary endocytic vesicles that have been generated by clathrin-dependent and clathrin-independent endocytosis; vesicles fuse with the early endosome to deliver cargo for sorting into recycling or degradation pathways.

IDA

CC

GO:0016023

cytoplasmic, membrane-bounded vesicle

A membrane-bounded vesicle found in the cytoplasm of the cell.

IEA

CC

GO:0031410

cytoplasmic vesicle

A vesicle found in the cytoplasm of a cell.

IDA

MF

GO:0005096

GTPase activator activity

Binds to and increases the activity of a GTPase, an enzyme that catalyzes the hydrolysis of GTP.

IEA

MF

GO:0017112

Rab guanyl-nucleotide exchange factor activity

Stimulates the exchange of guanyl nucleotides associated with a GTPase of the Rab family. Under normal cellular physiological conditions, the concentration of GTP is higher than that of GDP, favoring the replacement of GDP by GTP in association with the GTPase.

IMP

MF

GO:0017137

Rab GTPase binding

Interacting selectively and non-covalently with Rab protein, any member of the Rab subfamily of the Ras superfamily of monomeric GTPases.

IDA