Contribution of Ena/VASP proteins to intracellular motility of listeria requires phosphorylation and proline-rich core but not F-actin binding or multimerization.
Mol Biol Cell
; 13(7): 2383-96, 2002 Jul.
Article
in En
| MEDLINE
| ID: mdl-12134077
ABSTRACT
The Listeria model system has been essential for the identification and characterization of key regulators of the actin cytoskeleton such as the Arp2/3 complex and Ena/vasodilator-stimulated phosphoprotein (VASP) proteins. Although the role of Ena/VASP proteins in Listeria motility has been extensively studied, little is known about the contributions of their domains and phosphorylation state to bacterial motility. To address these issues, we have generated a panel of Ena/VASP mutants and, upon expression in Ena/VASP-deficient cells, evaluated their contribution to Ena/VASP function in Listeria motility. The proline-rich region, the putative G-actin binding site, and the Ser/Thr phosphorylation of Ena/VASP proteins are all required for efficient Listeria motility. Surprisingly, the interaction of Ena/VASP proteins with F-actin and their potential ability to form multimers are both dispensable for their involvement in this process. Our data suggest that Ena/VASP proteins contribute to Listeria motility by regulating both the nucleation and elongation of actin filaments at the bacterial surface.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phosphoproteins
/
Proline
/
Cell Adhesion Molecules
/
Cell Movement
/
Actins
/
Contractile Proteins
/
Cytoskeletal Proteins
/
Listeria
Limits:
Animals
Language:
En
Journal:
Mol Biol Cell
Journal subject:
BIOLOGIA MOLECULAR
Year:
2002
Document type:
Article
Affiliation country:
Germany