5vo5
Crystal structure of Lgd-Shrub complex, single chain fusion
Structural highlights
FunctionC2D1_DROME Negative regulator of the Notch signaling pathway, acting to restrict the activity of Notch to the dorsoventral (D/V) boundary of the wing imaginal disk. Also causes negative regulation of Notch during vein, eye, and bristle development. Acts by targeting Notch for endosomal degradation or recycling.[1] [2] Q8T0Q4_DROME Publication Abstract from PubMedThe ESCRT-III complex induces outward membrane budding and fission through homotypic polymerization of its core component Shrub/CHMP4B. Shrub activity is regulated by its direct interaction with a protein called Lgd in flies, or CC2D1A or B in humans. Here, we report the structural basis for this interaction and propose a mechanism for regulation of polymer assembly. The isolated third DM14 repeat of Lgd binds Shrub, and an Lgd fragment containing only this DM14 repeat and its C-terminal C2 domain is sufficient for in vivo function. The DM14 domain forms a helical hairpin with a conserved, positively charged tip, that, in the structure of a DM14 domain-Shrub complex, occupies a negatively charged surface of Shrub that is otherwise used for homopolymerization. Lgd mutations at this interface disrupt its function in flies, confirming functional importance. Together, these data argue that Lgd regulates ESCRT activity by controlling access to the Shrub self-assembly surface. Structural Basis for Regulation of ESCRT-III Complexes by Lgd.,McMillan BJ, Tibbe C, Drabek AA, Seegar TCM, Blacklow SC, Klein T Cell Rep. 2017 May 30;19(9):1750-1757. doi: 10.1016/j.celrep.2017.05.026. PMID:28564595[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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