| Structural highlights
Function
SLA1_YEAST Component of the PAN1 actin cytoskeleton-regulatory complex required for the internalization of endosomes during actin-coupled endocytosis. The complex links the site of endocytosis to the cell membrane-associated actin cytoskeleton. Mediates uptake of external molecules and vacuolar degradation of plasma membrane proteins. Plays a role in the proper organization of the cell membrane-associated actin cytoskeleton and promotes its destabilization.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15]
Publication Abstract from PubMed
The interaction network of Sla2, a vital endocytic mid-coat adaptor protein, undergoes constant rearrangement. Sla2 serves as a scaffold linking the membrane to the actin cytoskeleton, with its role modulated by the clathrin light chain (CLC), which inhibits Sla2's function under certain conditions. We show that Sla2 has two independent binding sites for CLC: one previously described in homologs of fungi (Sla2) and metazoa (Hip1R), and a second found only in Fungi. We present the structural model of the Sla2 actin-binding domains in the context of regulatory structural domains by cryoelectron microscopy. We provide an interaction map of Sla2 and the regulatory proteins Sla1 and Pan1, predicted by AI modeling and confirmed by molecular biophysics techniques. Pan1 may compete with CLC for the conserved Sla2-binding site. These results enhance the mapping of crucial interactions at endocytic checkpoints and highlight the divergence between Metazoa and Fungi in this vital process.
Sla2 is a core interaction hub for clathrin light chain and the Pan1/End3/Sla1 complex.,Draper-Barr G, Defelipe LA, Ruiz-Carrillo D, Gustavsson E, Landau M, Garcia-Alai M Structure. 2025 Apr 28:S0969-2126(25)00147-9. doi: 10.1016/j.str.2025.04.013. PMID:40347949[16]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
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- ↑ Tang HY, Cai M. The EH-domain-containing protein Pan1 is required for normal organization of the actin cytoskeleton in Saccharomyces cerevisiae. Mol Cell Biol. 1996 Sep;16(9):4897-914. PMID:8756649
- ↑ Yang S, Ayscough KR, Drubin DG. A role for the actin cytoskeleton of Saccharomyces cerevisiae in bipolar bud-site selection. J Cell Biol. 1997 Jan 13;136(1):111-23. PMID:9008707
- ↑ Ayscough KR, Stryker J, Pokala N, Sanders M, Crews P, Drubin DG. High rates of actin filament turnover in budding yeast and roles for actin in establishment and maintenance of cell polarity revealed using the actin inhibitor latrunculin-A. J Cell Biol. 1997 Apr 21;137(2):399-416. PMID:9128251
- ↑ Ayscough KR, Eby JJ, Lila T, Dewar H, Kozminski KG, Drubin DG. Sla1p is a functionally modular component of the yeast cortical actin cytoskeleton required for correct localization of both Rho1p-GTPase and Sla2p, a protein with talin homology. Mol Biol Cell. 1999 Apr;10(4):1061-75. PMID:10198057
- ↑ Tang HY, Xu J, Cai M. Pan1p, End3p, and S1a1p, three yeast proteins required for normal cortical actin cytoskeleton organization, associate with each other and play essential roles in cell wall morphogenesis. Mol Cell Biol. 2000 Jan;20(1):12-25. PMID:10594004
- ↑ Howard JP, Hutton JL, Olson JM, Payne GS. Sla1p serves as the targeting signal recognition factor for NPFX(1,2)D-mediated endocytosis. J Cell Biol. 2002 Apr 15;157(2):315-26. Epub 2002 Apr 8. PMID:11940605 doi:https://dx.doi.org/10.1083/jcb.200110027
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- ↑ Dewar H, Warren DT, Gardiner FC, Gourlay CG, Satish N, Richardson MR, Andrews PD, Ayscough KR. Novel proteins linking the actin cytoskeleton to the endocytic machinery in Saccharomyces cerevisiae. Mol Biol Cell. 2002 Oct;13(10):3646-61. PMID:12388763 doi:https://dx.doi.org/10.1091/mbc.E02-05-0262
- ↑ Li H, Page N, Bussey H. Actin patch assembly proteins Las17p and Sla1p restrict cell wall growth to daughter cells and interact with cis-Golgi protein Kre6p. Yeast. 2002 Sep 30;19(13):1097-112. PMID:12237851 doi:https://dx.doi.org/10.1002/yea.904
- ↑ Rodal AA, Manning AL, Goode BL, Drubin DG. Negative regulation of yeast WASp by two SH3 domain-containing proteins. Curr Biol. 2003 Jun 17;13(12):1000-8. PMID:12814545
- ↑ Gourlay CW, Dewar H, Warren DT, Costa R, Satish N, Ayscough KR. An interaction between Sla1p and Sla2p plays a role in regulating actin dynamics and endocytosis in budding yeast. J Cell Sci. 2003 Jun 15;116(Pt 12):2551-64. Epub 2003 May 6. PMID:12734398 doi:https://dx.doi.org/10.1242/jcs.00454
- ↑ Stamenova SD, Dunn R, Adler AS, Hicke L. The Rsp5 ubiquitin ligase binds to and ubiquitinates members of the yeast CIN85-endophilin complex, Sla1-Rvs167. J Biol Chem. 2004 Apr 16;279(16):16017-25. Epub 2004 Feb 3. PMID:14761940 doi:https://dx.doi.org/10.1074/jbc.M313479200
- ↑ Rodal AA, Kozubowski L, Goode BL, Drubin DG, Hartwig JH. Actin and septin ultrastructures at the budding yeast cell cortex. Mol Biol Cell. 2005 Jan;16(1):372-84. Epub 2004 Nov 3. PMID:15525671 doi:https://dx.doi.org/10.1091/mbc.E04-08-0734
- ↑ Gardiner FC, Costa R, Ayscough KR. Nucleocytoplasmic trafficking is required for functioning of the adaptor protein Sla1p in endocytosis. Traffic. 2007 Apr;8(4):347-58. Epub 2007 Feb 7. PMID:17286805 doi:https://dx.doi.org/10.1111/j.1600-0854.2007.00534.x
- ↑ Draper-Barr G, Defelipe LA, Ruiz-Carrillo D, Gustavsson E, Landau M, García-Alai M. Sla2 is a core interaction hub for clathrin light chain and the Pan1/End3/Sla1 complex. Structure. 2025 Apr 28:S0969-2126(25)00147-9. PMID:40347949 doi:10.1016/j.str.2025.04.013
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