Abstract
Phosphatidylinositol-4,5-bisphosphate [PtdIns(4,5)P2] is a key second messenger that regulates actin and membrane dynamics, as well as other cellular processes. Many of the effects of PtdIns(4,5)P2 are mediated by binding to effector proteins that contain a pleckstrin homology (PH) domain. Here, we identify two novel effectors of PtdIns(4,5)P2 in the budding yeast Saccharomyces cerevisiae: the PH domain containing protein Slm1 and its homolog Slm2. Slm1 and Slm2 serve redundant roles essential for cell growth and actin cytoskeleton polarization. Slm1 and Slm2 bind PtdIns(4,5)P 2 through their PH domains. In addition, Slm1 and Slm2 physically interact with Avo2 and Bit61, two components of the TORC2 signaling complex, which mediates Tor2 signaling to the actin cytoskeleton. Together, these interactions coordinately regulate Slm1 targeting to the plasma membrane. Our results thus identify two novel effectors of PtdIns(4,5)P2 regulating cell growth and actin organization and suggest that Slm1 and Slm2 integrate inputs from the PtdIns(4,5)P2 and TORC2 to modulate polarized actin assembly and growth.
| Original language | English |
|---|---|
| Pages (from-to) | 1883-1900 |
| Number of pages | 18 |
| Journal | Molecular Biology of the Cell |
| Volume | 16 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 2005 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Molecular Biology
- Genetics
- Cell Biology
Cite this
The pleckstrin homology domain proteins Slm1 and Slm2 are required for actin cytoskeleton organization in yeast and bind phosphatidylinositol-4,5- bisphosphate and TORC2. / Fadri, Maria; Daquinag, Alexes; Wang, Shimei; Xue, Tao; Kunz, Jeannette.
In: Molecular Biology of the Cell, Vol. 16, No. 4, 04.2005, p. 1883-1900.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The pleckstrin homology domain proteins Slm1 and Slm2 are required for actin cytoskeleton organization in yeast and bind phosphatidylinositol-4,5- bisphosphate and TORC2
AU - Fadri, Maria
AU - Daquinag, Alexes
AU - Wang, Shimei
AU - Xue, Tao
AU - Kunz, Jeannette
PY - 2005/4
Y1 - 2005/4
N2 - Phosphatidylinositol-4,5-bisphosphate [PtdIns(4,5)P2] is a key second messenger that regulates actin and membrane dynamics, as well as other cellular processes. Many of the effects of PtdIns(4,5)P2 are mediated by binding to effector proteins that contain a pleckstrin homology (PH) domain. Here, we identify two novel effectors of PtdIns(4,5)P2 in the budding yeast Saccharomyces cerevisiae: the PH domain containing protein Slm1 and its homolog Slm2. Slm1 and Slm2 serve redundant roles essential for cell growth and actin cytoskeleton polarization. Slm1 and Slm2 bind PtdIns(4,5)P 2 through their PH domains. In addition, Slm1 and Slm2 physically interact with Avo2 and Bit61, two components of the TORC2 signaling complex, which mediates Tor2 signaling to the actin cytoskeleton. Together, these interactions coordinately regulate Slm1 targeting to the plasma membrane. Our results thus identify two novel effectors of PtdIns(4,5)P2 regulating cell growth and actin organization and suggest that Slm1 and Slm2 integrate inputs from the PtdIns(4,5)P2 and TORC2 to modulate polarized actin assembly and growth.
AB - Phosphatidylinositol-4,5-bisphosphate [PtdIns(4,5)P2] is a key second messenger that regulates actin and membrane dynamics, as well as other cellular processes. Many of the effects of PtdIns(4,5)P2 are mediated by binding to effector proteins that contain a pleckstrin homology (PH) domain. Here, we identify two novel effectors of PtdIns(4,5)P2 in the budding yeast Saccharomyces cerevisiae: the PH domain containing protein Slm1 and its homolog Slm2. Slm1 and Slm2 serve redundant roles essential for cell growth and actin cytoskeleton polarization. Slm1 and Slm2 bind PtdIns(4,5)P 2 through their PH domains. In addition, Slm1 and Slm2 physically interact with Avo2 and Bit61, two components of the TORC2 signaling complex, which mediates Tor2 signaling to the actin cytoskeleton. Together, these interactions coordinately regulate Slm1 targeting to the plasma membrane. Our results thus identify two novel effectors of PtdIns(4,5)P2 regulating cell growth and actin organization and suggest that Slm1 and Slm2 integrate inputs from the PtdIns(4,5)P2 and TORC2 to modulate polarized actin assembly and growth.
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U2 - 10.1091/mbc.E04-07-0564
DO - 10.1091/mbc.E04-07-0564
M3 - Article
VL - 16
SP - 1883
EP - 1900
JO - Molecular Biology of the Cell
JF - Molecular Biology of the Cell
SN - 1059-1524
IS - 4
ER -