Structural Basis for Regulation of ESCRT-III Complexes by Lgd

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Structural Basis for Regulation of ESCRT-III Complexes by Lgd Brian J. McMillan, Christine Tibbe, Andrew A. Drabek, Tom C.M. Seegar, Stephen C. Blacklow, Thomas Klein  Cell Reports  Volume 19, Issue 9, Pages 1750-1757 (May 2017) DOI: 10.1016/j.celrep.2017.05.026 Copyright © 2017 The Author(s) Terms and Conditions

Cell Reports 2017 19, 1750-1757DOI: (10.1016/j.celrep.2017.05.026) Copyright © 2017 The Author(s) Terms and Conditions

Figure 1 Interaction of DM14-3 of Lgd with Shrub (A) Domain organization of Lgd, highlighting the four DM14 modules and C-terminal C2 domain. (B–N) Wing imaginal discs of Drosophila late third-instar larvae. (B) A wild-type disc, stained for wingless (wg). (C–N) In each panel, the indicated Lgd construct was transgenically expressed at the same insertion site in lgd-null (lgdd7/lgdd7) and lgd-null/shrub heterozygous (lgdd7/lgdd7, shrub4-1/+) backgrounds. Each imaginal disc was stained for the Notch target gene, wg, as a surrogate for MVB dysfunction. wg expression is restricted to the dorsal/ventral (D/V) boundary line during normal development (arrowhead in B). Loss of ESCRT function results in ectopic broadening of the Wg D/V stripe, as seen in (C). Lethality in early L3 stage of development was observed in (D) and (J). Scale bar, 200 μm. (O) Interaction of Shrub (6–106) with Lgd (DM14-3, orange; DM14-4, red; DM14-3+4, gray) detected using SPR. Response units are normalized to the molecular mass of each Lgd construct. See also Figures S1 and S2 and Table S1. Cell Reports 2017 19, 1750-1757DOI: (10.1016/j.celrep.2017.05.026) Copyright © 2017 The Author(s) Terms and Conditions

Figure 2 Structure of the Third DM14 Domain, Residues 359–423, of Lgd (A) Cartoon representation colored on a sliding scale from N terminus (blue) to C terminus (red). (B) Surface representation colored by conservation on a sliding scale from cyan (least conserved) to maroon (most conserved). (C) Surface representation colored by electrostatic potential from negative (red) to positive (blue). See also Figure S2. Cell Reports 2017 19, 1750-1757DOI: (10.1016/j.celrep.2017.05.026) Copyright © 2017 The Author(s) Terms and Conditions

Figure 3 Crystal Structure of the Lgd-Shrub Fusion Protein (A) Left panel: Lgd-Shrub complex. DM14-3 is shown as a cartoon (green) and Shrub as an electrostatic surface on a sliding scale from negative (red) to positive (blue). The polyglycine linker connecting Lgd and Shrub, illustrated here with a dotted line, is not visible in the structure. Right panel: crystallographic model of a Shrub homopolymer (based on PDB entry 5J45). (B) Key residues at the Lgd:Shrub binding interface. Lgd is shown as a cartoon in green. Shrub is shown as a cartoon in cyan. Charged residues at the interface are shown as sticks with salt bridges illustrated by dotted lines. See also Figure S3. Cell Reports 2017 19, 1750-1757DOI: (10.1016/j.celrep.2017.05.026) Copyright © 2017 The Author(s) Terms and Conditions

Figure 4 Analysis of the Lgd-Shrub Interface (A) Interaction between DM14 domain three of Lgd (residues 359–423) and Shrub (6–106) measured using SPR. Interaction between wild-type molecules is shown in orange. Interaction between wild-type Shrub and Lgd R393A is shown in blue. Interaction between Shrub E86R and wild-type Lgd is shown in green. (B–G) Truncated Lgd (3-4-C2 construct) molecules with the listed mutations were transgenically expressed in the indicated genetic backgrounds. Fly wing discs were stained for Wg expression as a surrogate for MVB dysfunction. (H–M) Full-length Lgd molecules (1-2-3-4-C2) with the listed mutations were transgenically expressed in the indicated genetic backgrounds. Fly wing discs were stained for Wg expression as a surrogate for MVB dysfunction. Scale bar, 200 μm. See also Table S1. Cell Reports 2017 19, 1750-1757DOI: (10.1016/j.celrep.2017.05.026) Copyright © 2017 The Author(s) Terms and Conditions