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Lecture 9 - Motility
Names and functions of proteins and molecules reguarding Cell Motility
25
Biology
Undergraduate 3
03/06/2013

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Term
GAP
Definition
GTPase activating protein
- increases the innate GTPase activity
Term
GDI
Definition
GDP dissociation inhibitor
- sequesters GDP-ras in an inactive state
Term
GEF
Definition
Guanosine nucleotide exchange factor
- catalyzes GDP release to allow GTP binding
Term
Receptor Tyrosine Kinases
Definition
activate Ras-GEFs when bound
Term
Ras
Definition
regulated cell proliferation
Term
Ran
Definition
nuclear import cycling
- facilitates nuclear protein dissociation and cycling of Importin
Term
Rab and Arf
Definition
targeted vesicle trafficking
Term
Rab-GTPase
Definition
targets bound vesicles to specific sites
Term
Rho
Definition
regulated actin nucleation
- formation of Stress Fibers
Term
Rac
Definition
formation of lamellapodia
Term
Cdc42
Definition
formation of filopodia
Term
Lamellipodia formation
Definition
protrusive, membrane periphery, orthogonal arrays
Term
Filopodia formation
Definition
protrusive, membrane periphery, bundled filaments
Term
Stress fiber formation
Definition
contractive, cell interior, bundled filaments
Term
Post-translational modification of Rho family
Definition
isoprenylation of c-terminal cysteine
- tagging a protein to a lipid and anchors Rho, Rac, and Cdc42 at the plasma membrane
Term
Myosin
Definition
the Actin motor protein
Term
Head domain of Myosin
Definition
ATP-dependent motor (highly conserved)
Term
Lever domain of Myosin
Definition
step size and direction
Term
Tail domain of Myosin
Definition
defines cargo (most variable region)
Term
Integrins
Definition
transmembrane proteins in focal adhesions
Term
Blebistatin
Definition
(MyoII inhibitor) inhibits integrin migration
Term
Lamellapodial extension
Definition
driven by short Actin filaments extending from Arp2/3-nucleated dendritic networks
Term
Filopodia
Definition
bundled actin protrusions at the leading edge
- emerge from existing dendritic filaments
Term
Ena/VASP
Definition
enables barbed end growth
- promotes barbed end addition
- inhibits capping protein binding
- activated by Cdc42
Term
Fascin
Definition
filament bundling protein found in filopodia precursors
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