Abstract
The abundant Plasmodium falciparum merozoite surface protein MSP2, a potential malaria vaccine candidate, is an intrinsically disordered protein with some nascent secondary structure present in its conserved N-terminal region. This relatively ordered region has been implicated in both membrane interactions and amyloid-like aggregation of the protein, while the significance of the flanking-disordered region is unclear. In this study, we show that aggregation of the N-terminal conserved region of MSP2 is influenced in a length- and sequence-dependent fashion by the disordered central variable sequences. Intriguingly, MSP2 peptides containing the conserved region and the first five residues of the variable disordered regions aggregated more rapidly than a peptide corresponding to the conserved region alone. In contrast, MSP2 peptides extending 8 or 12 residues into the disordered region aggregated more slowly, consistent with the expected inhibitory effect of flanking-disordered sequences on the aggregation of amyloidogenic ordered sequences. Computational analyses indicated that the helical propensity of the ordered region of MSP2 was modulated by the adjacent disordered five residues in a sequence-dependent manner. Nuclear magnetic resonance and circular dichroism spectroscopic studies with synthetic peptides confirmed the computational predictions, emphasizing the correlation between aggregation propensity and conformation of the ordered region and the effects thereon of the adjacent disordered region. These results show that the effects of flanking-disordered sequences on a more ordered sequence may include enhancement of aggregation through modulation of the conformational properties of the more ordered sequence.
Similar content being viewed by others
Abbreviations
- 3D7-MSP21–30 :
-
N-terminal 30 residues of 3D7-MSP2
- 3D7-MSP21–33 :
-
N-terminal 33 residues of 3D7-MSP2
- 3D7-MSP21–37 :
-
N-terminal 37 residues of 3D7-MSP2
- CD:
-
Circular dichroism
- ELM:
-
Eukaryote linear motif
- FC27-MSP21–30 :
-
N-terminal 30 residues of FC27-MSP2
- GPI:
-
Glycosylphosphatidylinisotol
- IDPs/IDRs:
-
Intrinsically disordered proteins/regions
- MoRF:
-
Molecular recognition feature
- MSP2:
-
Merozoite surface protein 2
- MSP21–25 :
-
N-terminal 25 residues of MSP2
- NMR:
-
Nuclear magnetic resonance
- PSE:
-
Preformed structured element
- SLiM:
-
Short linear motif
- TEM:
-
Transmission electron microscopy
- ThT:
-
Thioflavin T
- TFE:
-
Trifluoroethanol
References
Abedini A, Raleigh DP (2009) A role for helical intermediates in amyloid formation by natively unfolded polypeptides? Phys Biol 6:015005. https://doi.org/10.1088/1478-3975/6/1/015005
Abeln S, Frenkel D (2008) Disordered flanks prevent peptide aggregation. PLoS Comput Biol 4:e1000241. https://doi.org/10.1371/journal.pcbi.1000241
Adda CG et al (2009) Plasmodium falciparum merozoite surface protein 2 is unstructured and forms amyloid-like fibrils. Mol Biochem Parasitol 166:159–171. https://doi.org/10.1016/j.molbiopara.2009.03.012
Ahmed AB, Kajava AV (2013) Breaking the amyloidogenicity code: methods to predict amyloids from amino acid sequence. FEBS Lett 587:1089–1095. https://doi.org/10.1016/j.febslet.2012.12.006
Bhattacherjee A, Wallin S (2012) Coupled folding-binding in a hydrophobic/polar protein model: impact of synergistic folding and disordered flanks. Biophys J 102:569–578. https://doi.org/10.1016/j.bpj.2011.12.008
Borcherds W et al (2014) Disorder and residual helicity alter p53-Mdm2 binding affinity and signaling in cells. Nat Chem Biol 10:1000–1002. https://doi.org/10.1038/nchembio.1668
Chen J, Kriwacki RW (2018) Intrinsically disordered proteins: structure, function and therapeutics. J Mol Biol. https://doi.org/10.1016/j.jmb.2018.06.012
Chiti F, Dobson CM (2009) Amyloid formation by globular proteins under native conditions. Nat Chem Biol 5:15–22. https://doi.org/10.1038/nchembio.131
Conchillo-Sole O, de Groot NS, Aviles FX, Vendrell J, Daura X, Ventura S (2007) AGGRESCAN: a server for the prediction and evaluation of “hot spots” of aggregation in polypeptides. BMC Bioinform 8:65. https://doi.org/10.1186/1471-2105-8-65
Cowman AF et al (2000) Functional analysis of proteins involved in Plasmodium falciparum merozoite invasion of red blood cells. FEBS Lett 476:84–88
Delaglio F, Grzesiek S, Vuister GW, Zhu G, Pfeifer J, Bax A (1995) NMRPipe: a multidimensional spectral processing system based on UNIX pipes. J Biomol NMR 6:277–293
Edwards RJ, Davey NE, Shields DC (2007) SLiMFinder: a probabilistic method for identifying over-represented, convergently evolved, short linear motifs in proteins. PLoS ONE 2:e967. https://doi.org/10.1371/journal.pone.0000967
Eisenberg D, Jucker M (2012) The amyloid state of proteins in human diseases. Cell 148:1188–1203. https://doi.org/10.1016/j.cell.2012.02.022
Feng ZP, Zhang X, Han P, Arora N, Anders RF, Norton RS (2006) Abundance of intrinsically unstructured proteins in P. falciparum and other apicomplexan parasite proteomes. Mol Biochem Parasitol 150:256–267
Fenton B et al (1991) Structural and antigenic polymorphism of the 35- to 48-kilodalton merozoite surface antigen (MSA-2) of the malaria parasite Plasmodium falciparum. Mol Cell Biol 11:963–971
Fernandez-Escamilla AM, Rousseau F, Schymkowitz J, Serrano L (2004) Prediction of sequence-dependent and mutational effects on the aggregation of peptides and proteins. Nat Biotechnol 22:1302–1306
Fisher CK, Stultz CM (2011) Constructing ensembles for intrinsically disordered proteins. Curr Opin Struc Biol 21:426–431. https://doi.org/10.1016/j.sbi.2011.04.001
Fuxreiter M, Simon I, Friedrich P, Tompa P (2004) Preformed structural elements feature in partner recognition by intrinsically unstructured proteins. J Mol Biol 338:1015–1026. https://doi.org/10.1016/j.jmb.2004.03.017
Fuxreiter M, Tompa P, Simon I (2007) Local structural disorder imparts plasticity on linear motifs. Bioinformatics 23:950–956. https://doi.org/10.1093/bioinformatics/btm035
Galzitskaya OV, Garbuzynskiy SO, Lobanov MY (2006) Prediction of amyloidogenic and disordered regions in protein chains. PLoS Comput Biol 2:e177. https://doi.org/10.1371/journal.pcbi.0020177
Gilson PR et al (2006) Identification and stoichiometry of glycosylphosphatidylinositol-anchored membrane proteins of the human malaria parasite Plasmodium falciparum. Mol Cell Proteom 5:1286–1299. https://doi.org/10.1074/mcp.M600035-MCP200
Guy AJ et al (2015) Insights into the immunological properties of intrinsically disordered malaria proteins using proteome scale predictions. PLoS ONE 10:e0141729. https://doi.org/10.1371/journal.pone.0141729
Hall D, Hirota N, Dobson CM (2005) A toy model for predicting the rate of amyloid formation from unfolded protein. J Mol Biol 351:195–205. https://doi.org/10.1016/j.jmb.2005.05.013
Hazy E, Tompa P (2009) Limitations of induced folding in molecular recognition by intrinsically disordered proteins. ChemPhysChem 10:1415–1419. https://doi.org/10.1002/cphc.200900205
Krishnarjuna B et al (2018) Transient antibody-antigen interactions mediate the strain-specific recognition of a conserved malaria epitope. Comm Biol 1:58–67. https://doi.org/10.1038/s42003-018-0063-1
Liu G et al (2010) Mechanistic studies of peptide self-assembly: transient alpha-helices to stable beta-sheets. JACS 132:18223–18232. https://doi.org/10.1021/ja1069882
Low A et al (2007) Merozoite surface protein 2 of Plasmodium falciparum: expression, structure, dynamics, and fibril formation of the conserved N-terminal domain. Biopolymers 87:12–22. https://doi.org/10.1002/bip.20764
MacRaild CA, Pedersen MO, Anders RF, Norton RS (2012) Lipid interactions of the malaria antigen merozoite surface protein 2. BBA 1818:2572–2578
MacRaild CA et al (2015) Conformational dynamics and antigenicity in the disordered malaria antigen merozoite surface protein 2. PLoS ONE 10:e0119899
Marcon G, Plakoutsi G, Chiti F (2006) Protein aggregation starting from the native globular state. Method Enzymol 413:75–91. https://doi.org/10.1016/S0076-6879(06)13004-9
Mittag T, Forman-Kay JD (2007) Atomic-level characterization of disordered protein ensembles. Current Opin Struc Biol 17:3–14. https://doi.org/10.1016/j.sbi.2007.01.009
Mohan A, Oldfield CJ, Radivojac P, Vacic V, Cortese MS, Dunker AK, Uversky VN (2006) Analysis of molecular recognition features (MoRFs). J Mol Biol 362:1043–1059. https://doi.org/10.1016/j.jmb.2006.07.087
Munoz V, Serrano L (1994) Elucidating the folding problem of helical peptides using empirical parameters. Nat Struc Biol 1:399–409
Neduva V, Russell RB (2005) Linear motifs: evolutionary interaction switches. FEBS Lett 579:3342–3345. https://doi.org/10.1016/j.febslet.2005.04.005
Piotto M, Saudek V, Sklenar V (1992) Gradient-tailored excitation for single-quantum NMR spectroscopy of aqueous solutions. J Biomol NMR 2:661–665
Sanchez de Groot N, Pallares I, Aviles FX, Vendrell J, Ventura S (2005) Prediction of “hot spots” of aggregation in disease-linked polypeptides. BMC Struc Biol 5:18. https://doi.org/10.1186/1472-6807-5-18
Schwarzinger S, Kroon GJ, Foss TR, Wright PE, Dyson HJ (2000) Random coil chemical shifts in acidic 8 M urea: implementation of random coil shift data in NMRView. J Biomol NMR 18:43–48
Smythe JA, Peterson MG, Coppel RL, Saul AJ, Kemp DJ, Anders RF (1990) Structural diversity in the 45-kilodalton merozoite surface antigen of Plasmodium falciparum. Mol Biochem Parasitol 39:227–234
Smythe JA, Coppel RL, Day KP, Martin RK, Oduola AM, Kemp DJ, Anders RF (1991) Structural diversity in the Plasmodium falciparum merozoite surface antigen 2. PNAS USA 88:1751–1755
Tycko R (2014) Physical and structural basis for polymorphism in amyloid fibrils. Protein Sci 23:1528–1539. https://doi.org/10.1002/pro.2544
Uversky VN (2008) Amyloidogenesis of natively unfolded proteins. Curr Alzheimer Res 5:260–287
Uversky VN (2013) A decade and a half of protein intrinsic disorder: biology still waits for physics. Protein Sci 22:693–724. https://doi.org/10.1002/pro.2261
Vacic V, Oldfield CJ, Mohan A, Radivojac P, Cortese MS, Uversky VN, Dunker AK (2007) Characterization of molecular recognition features, MoRFs, and their binding partners. J Proteome Res 6:2351–2366. https://doi.org/10.1021/pr0701411
Weedall GD, Conway DJ (2010) Detecting signatures of balancing selection to identify targets of anti-parasite immunity. Trends Parasitol 26:363–369. https://doi.org/10.1016/j.pt.2010.04.002
Yang X et al (2007) A partially structured region of a largely unstructured protein, Plasmodium falciparum merozoite surface protein 2 (MSP2), forms amyloid-like fibrils. J Pept Sci 13:839–848. https://doi.org/10.1002/psc.910
Yang X et al (2010) Identification of key residues involved in fibril formation by the conserved N-terminal region of Plasmodium falciparum merozoite surface protein 2 (MSP2). Biochimie 92:1287–1295. https://doi.org/10.1016/j.biochi.2010.06.001
Zhang X et al (2008) Solution conformation, backbone dynamics and lipid interactions of the intrinsically unstructured malaria surface protein MSP2. J Mol Biol 379:105–121
Zhang X et al (2012) Role of the helical structure of the N-terminal region of Plasmodium falciparum merozoite surface protein 2 in fibril formation and membrane interaction. Biochemistry 51:1380–1387. https://doi.org/10.1021/bi201880s
Acknowledgements
We thank F. Delaglio and A. Bax for providing NMRPipe and NMRDraw, T. D. Goddard and D. Kneller for Sparky. This work was supported by the National Natural Science Foundation of China (Grant Number 31470775), the Australia China Young Scientist Exchange Program (2015), the International Science and Technology Cooperation Plan of Anhui Province (Grant Number 1503062010), and the Key Research Program of the Education Department of Anhui Province (Grant Number KJ2014ZD01). R.S.N. acknowledges fellowship support from the Australian National Health and Medical Research Council.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
The authors declare that they have no conflict of interest.
Rights and permissions
About this article
Cite this article
Zhang, W., Zhang, J., MacRaild, C.A. et al. Modulation of the aggregation of an amyloidogenic sequence by flanking-disordered region in the intrinsically disordered antigen merozoite surface protein 2. Eur Biophys J 48, 99–110 (2019). https://doi.org/10.1007/s00249-018-1337-8
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00249-018-1337-8