“…TPR domains mediate protein-protein interactions, and proteins containing these domains are part of protein complexes with diverse functions including transcriptional repression, protein import, heat shock, and cell cycle regulation (Blatch and Lässle, 1999;D'Andrea and Regan, 2003). TPR domaincontaining proteins in plants have been implicated in responses to various hormones, assembly of the photosynthetic machinery, plastid partitioning, and root development (Jacobsen et al, 1996;Rosado et al, 2006;Yang et al, 2011;Hu et al, 2014;Bhuiyan et al, 2015). Confocal microscopy of cells from the elongation zone and root hairs of hlb1-1 seedlings expressing HLB1pro:HLB1-GFP revealed that the fusion protein localized to the cytoplasm and decorated distinct and dynamic foci (Figures 6C and 6D; Supplemental Movie 4).…”