Nature Structural and Molecular Biology: doi: /nsmb Supplementary Figure 1

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1 Supplementary Figure 1 Quantitation of the binding of pro53 peptide to sorla Vps10p measured by the AP reporter assay. The graph shows tracings of the typical chromogenic AP reaction observed with AP-pro53 (orange) or control AP-MycHis (blue) eluted from the sorla Vps10p-beads. Note that gradual increase in the absorbance with the AP-MycHis is indistinguishable from that with mock sample (where no AP activity is present in the reaction mixture), indicating that the background nonspecific binding of AP protein to the beads is negligible.

2 Supplementary Figure 2 Sequence alignment of the Vps10p domains. Amino acid sequences are from human sorla (SORLA_hu, NP_ ), human sortilin (sort_hu, CCA66904), mouse SorCS1 (sorcs1_mo, Q9JLC4), and yeast Vps10p (Vps10p_sp, O42930). Secondary structure elements are denoted by straight (strands) or wavy (helices) lines below each sequence. Strand designation is shown above the alignment with the same color code as in Fig. 3. The L1 and L2 segments are highlighted in salmon and cyan, respectively. Cysteines are shown with a grey background with lines connecting the disulfide-bonded pair. The Gly511 mutated in a familial AD patient is marked by a red box. Propeptide cleavage sites are indicated by //.

3 Supplementary Figure 3 Close-up view of the propeptide-binding site in the propeller tunnel. The Vps10p propeller domain (gray) is shown in surface (left) or ribbon (right) presentations, with L1, L2, and the AD-causing mutation residue Gly511 colored in salmon, cyan, and red, respectively. Propeptide ligand bound inside the tunnel is shown in CPK model in both panels.

4 Supplementary Figure 4

5 Residue-wise conformational flexibility of the sorla Vps10p domain. (a) Structural changes that accompany propeptide binding. The residue number is plotted against distance between mainchain Cα atoms in the ligand-free (at ph 4.5) and the propeptide-bound (at ph 6.5) forms of the sorla Vps10p domain after structural superposition. Regions disordered in either structure are indicated by horizontal light blue bars. Note that the largest structural differences are found in L1 and the 10CC-b segments. (b) RMSF values for each residue during the MD simulation of the propeptidebound form of sorla Vps10p domain (see the legend to Figure 5d) are plotted similarly to the (a).

6 Supplementary Figure 5 Prediction of β-aggregation tendency of various sorla Vps10p ligand peptides with the PASTA server. The amino acid sequencse of (a) the sorla propeptide (53 residues), (b) Aβ40 (40 residues), (c) NT (13 residues), (d) HA (11 residues), and the sortilin propeptide (44 residues) were fed to the PASTA server ( and the resultant per-residue aggregation probability scores, h(k), are plotted.

7 Supplementary Table 1 Affinity values of sorla Vps10p domain toward various peptides/ligands. Ligand Receptor Format K D Reference GST-sortilin pro (1-44) sorla Vps10p BIAcore 5-15 nm* [17] GST-sorLA pro (1-53) sorla Vps10p BIAcore 47 nm* [50] GST-sorLA pro (19-38) sorla Vps10p BIAcore 150 nm* [50] β-vldl(apoe-rich) FL sorla on KT38 cells radioligand assay 28 µg/ml** [3] PDGF-BB FL sorla BIAcore 10 nm*** [51] HA (bipeptide) unpurified sorla Vps10p radioligand Scatchard analysis 1.3 nm* [52] HA (monomer) sorla Vps10p BIAcore ~500 nm [17] sorla pro sorla Vps10p FP 441 nm this study Aβ40 sorla Vps10p FP 235 nm this study Aβ 6-20 sorla Vps10p FP 692 nm this study NT sorla Vps10p FP 1.0 µm this study * Because of the bivalent nature of the ligand (either GST-fusion or crosslinked peptide), these values are overestimated. ** ~100nM assuming that β-ldl is equal to one apoe chain of 30 kda. Likely to be mediated by the LA region rather than the Vps10p domain. *** Not mediated by the Vps10p domain Supplementary References [50] U.B. Westergaard, E.S. Sorensen, G. Hermey, M.S. Nielsen, A. Nykjaer, K. Kirkegaard, C. Jacobsen, J. Gliemann, P. Madsen, C.M. Petersen, Functional organization of the sortilin Vps10p domain. J Biol Chem 279 (2004) [51] J. Gliemann, G. Hermey, A. Nykjaer, C.M. Petersen, C. Jacobsen, P.A. Andreasen, The mosaic receptor sorla/lr11 binds components of the plasminogen-activating system and platelet-derived growth factor-bb similarly to LRP1 (low-density lipoprotein receptor-related protein), but mediates slow internalization of bound ligand. Biochem J 381 (2004) [52] J. Lintzel, I. Franke, I.B. Riedel, H.C. Schaller, W. Hampe, Characterization of the VPS10 domain of SorLA/LR11 as binding site for the neuropeptide HA. Biol Chem 383 (2002)

8 Supplementary Table 2. Binding of various peptide-ap fusion proteins to the sorla Vps10p domain. Construct Sequence Bound AP activity (%) a AP-mycHis AP-13aa-EALSLEGPEQKLISEEDLNSAVDHHHHHH 1.6 ± 0.6 AP-pro53 AP-13aa-EVWTQRLHGGSAPLPQDRGFLVVQGDPRELRLWARGDARGASRADEKPLRRKR 100 AP-Aβ 1-32 AP-13aa-DAEFRHDSGYEVHHQKLVFFAEDVGSNKGAII 78 ± 6.7 AP-NT AP-15aa-ELYENKPRRPYIL 1.1 ± 0.4 AP-HA AP-15aa-QPPGGSKVILF 1.1 ± 0.4 AP-SORTpropeptide AP-15aa-QDRLDAPPPPAAPLPRWSGPIGVSWGLRAAAAGGAFPRGGRWRR 5.8 ± 0.7 AP-BACEpropeptide AP-15aa-TQHGIRLPLRSGLGGAPLGLRLP 1.1 ± 0.3 a AP activities associated with the sorla Vps10p-coated beads are expressed as percent of the value obtained with C-terminally fused pro53 (n=3; mean ± s.d.).

9 Supplementary Table 3. Binding of various mutant sorla propeptides to sorla Vps10p. Construct Sequence Bound AP activity (%) a N-terminal fusion AP-pro53 AP-13aa-EVWTQRLHGGSAPLPQDRGFLVVQGDPRELRLWARGDARGASRADEKPLRRKR 100 AP-pro28 AP-13aa-EVWTQRLHGGSAPLPQDRGFLVVQGDPR 103 ± 5.3 AP-pro26 AP-13aa-EVWTQRLHGGSAPLPQDRGFLVVQGD 76 ± 8.0 AP-pro25 AP-13aa-EVWTQRLHGGSAPLPQDRGFLVVQG 146 ± 26 AP-pro24 AP-13aa-EVWTQRLHGGSAPLPQDRGFLVVQ 602 ± 121 AP-pro23 AP-13aa-EVWTQRLHGGSAPLPQDRGFLVV 2.8 ± 1.6 AP-pro53(G19A) AP-13aa A ± 1.8 AP-pro53(F20A) AP-13aa A ± 0.4 AP-pro53(L21A) AP-13aa A ± 48 AP-pro53(V22A) AP-13aa A ± 6.8 AP-pro53(V23A) AP-13aa A ± 0.8 AP-pro53(Q24A) AP-13aa A ± 7.0 AP-pro53(G25A) AP-13aa A ± 34 C-terminal fusion pro49-ap EVWTQRLHGGSAPLPQDRGFLVVQGDPRELRLWARGDARGASRADEKPL-4aa-AP 354 ± 26 pro49-ap(g19a) A aa-AP 10 ± 1.5 pro49-ap(g25a) A aa-AP 457 ± 50 a AP activities associated with the sorla Vps10p-coated beads are expressed as percent of the value obtained with C-terminally fused pro53 (n=3; mean ± s.d.).

10 Supplementary Table 4. Binding of various mutant Aβ peptides to sorla Vps10p. Construct Sequence Bound AP activity (%) a AP-Aβ 1-40 AP-13aa-DAEFRHDSGYEVHHQKLVFFAEDVGSNKGAIIGLMVGGVV N.D. AP-Aβ 1-32 AP-13aa-DAEFRHDSGYEVHHQKLVFFAEDVGSNKGAII 117 ± 5.8 AP-Aβ 1-22 AP-13aa-DAEFRHDSGYEVHHQKLVFFAE 42 ± 6.7 AP-Aβ 1-16 AP-13aa-DAEFRHDSGYEVHHQK 0.2 ± 0.1 AP-Aβ 1-22 (G9A) AP-13aa A ± 1.2 AP-Aβ 1-22 (Y10A) AP-13aa A ± 0.2 AP-Aβ 1-22 (E11A) AP-13aa A ± 2.9 AP-Aβ 1-22 (V12A) AP-13aa A ± 5.7 AP-Aβ 1-22 (H13A) AP-13aa A ± 0.2 AP-Aβ 1-22 (H14A) AP-13aa A ± 1.9 AP-Aβ 1-22 (Q15A) AP-13aa A ± 2.5 AP-Aβ 1-22 (K16A) AP-13aa A N.D. AP-Aβ 1-22 (L17A) AP-13aa A ± 5.4 AP-Aβ 1-22 (V18A) AP-13aa A ± 0.1 AP-Aβ 1-22 (F19A) AP-13aa A ± 0.2 AP-Aβ 1-22 (F20A) AP-13aa A ± 0.1 a AP activities associated with the sorla Vps10p-coated beads are expressed as percent of the value obtained with C-terminally fused pro53 (n=3; mean ± s.d.). N.D., not determined because the AP-fusion proteins were not secreted into the medium by the transfected cells.

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