This is the tubulin-binding TOG domain of two related families of microtubules (MTs) regulatory proteins, XMAP215/Dis1 and Cytoplasmic Linker ASsociated Proteins CLASP [1-3]. XMAP215/Dis1 family includes Stu2 from S. cerevisiae, S. pombe Alp14 and Dis1, A. thaliana MOR1, C. elegans Zyg9, D. melanogaster MiniSpindles (MSPS) and human ch-TOG (also known as Cytoskeleton-associated protein 5), which have conserved roles in promoting the assembly of microtubules [1]. CLASP proteins promote MT rescue and suppress MT catastrophe events [1,2].

1: Regulation of microtubule dynamics by TOG-domain proteins XMAP215/Dis1 and CLASP. Al-Bassam J, Chang F; Trends Cell Biol. 2011;21:604-614. PMID:21782439

2: A TOG Protein Confers Tension Sensitivity to Kinetochore-Microtubule Attachments. Miller MP, Asbury CL, Biggins S; Cell. 2016;165:1428-1439. PMID:27156448

3: Structural basis of Stu2 recruitment to yeast kinetochores. Zahm JA, Stewart MG, Carrier JS, Harrison SC, Miller MP; Elife. 2021; [Epub ahead of print] PMID:33591274