Cited by 168Protein Structure and DynamicsComputational Drug Discovery MethodsAdvanced Chemical Physics Studies

Molecular Dynamics—Solvated Interaction Energy Studies of Protein–Protein Interactions: The MP1–p14 Scaffolding Complex

Cui, Qizhi, Sulea, Traian, Schrag, Joseph D., Munger, Christine, Hung, Ming-Ni, Naïm, Marwen, Cygler, Miroslaw, Purisima, Enrico O.·2008·Journal of Molecular Biology

Abstract

Using the MP1-p14 scaffolding complex from the mitogen-activated protein kinase signaling pathway as model system, we explored a structure-based computational protocol to probe and characterize binding affinity hot spots at protein-protein interfaces. Hot spots are located by virtual alanine-scanning consensus predictions over three different energy functions and two different single-structure representations of the complex. Refined binding affinity predictions for select hot-spot mutations are carried out by applying first-principle methods such as the molecular mechanics generalized Born surface area (MM-GBSA) and solvated interaction energy (SIE) to the molecular dynamics (MD) trajectories for mutated and wild-type complexes. Here, predicted hot-spot residues were actually mutated to alanine, and crystal structures of the mutated complexes were determined. Two mutated MP1-p14 complexes were investigated, the p14(Y56A)-mutated complex and the MP1(L63A,L65A)-mutated complex. Alternative ways to generate MD ensembles for mutant complexes, not relying on crystal structures for mutated complexes, were also investigated. The SIE function, fitted on protein-ligand binding affinities, gave absolute binding affinity predictions in excellent agreement with experiment and outperformed standard MM-GBSA predictions when tested on the MD ensembles of Ras-Raf and Ras-RalGDS protein-protein complexes. For wild-type and mutant MP1-p14 complexes, SIE predictions of relative binding affinities were supported by a yeast two-hybrid assay that provided semiquantitative relative interaction strengths. Results on the MP1-mutated complex suggested that SIE predictions deteriorate if mutant MD ensembles are approximated by just mutating the wild-type MD trajectory. The SIE data on the p14-mutated complex indicated feasibility for generating mutant MD ensembles from mutated wild-type crystal structure, despite local structural differences observed upon mutation. For energetic considerations, this would circumvent costly needs to produce and crystallize mutated complexes. The sensitized protein-protein interface afforded by the p14(Y56A) mutation identified here has practical applications in screening-based discovery of first-generation small-molecule hits for further development into specific modulators of the mitogen-activated protein kinase signaling pathway.

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Crossref · 10.1016/j.jmb.2008.04.035

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  • The structures of LAMTOR2, LAMTOR3 and LAMTOR5 revealed roadblock folds for the individual LAMTOR3 and LAMTOR5 monomers and the formation of MP1/p14 heterodimers by edge-to-edge juxtaposition of the roadblock domains.

    “The structures of LAMTOR2, LAMTOR3 and LAMTOR5 were the first to be characterized prior to the discovery of the Ragulator complex (Kurzbauer et al., 2004; Cui et al., 2008; Lunin et al., 2004; Qian et al., 2005; Garcia-Saez et al., 2011), revealing roadblock folds for the individual LAMTOR3 and LAMTOR5 monomers, and the formation of MP1/p14 heterodimers by edge-to-edge juxtaposition of the roadb”

    From Signal integration in the (m)TORC1 growth pathway (2018) · cites this paper as Cui et al., 2008

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Authors
Cui, Q., Sulea, T., Schrag, J. D., Munger, C., Hung, M.-N., Naïm, M., Cygler, M., & Purisima, E. O.
Affiliations
  • Biotechnology Research Institute (CA)
  • McGill University (CA)
Corresponding author
Purisima, Enrico O.
Venue
Journal of Molecular Biology
Publisher
Elsevier BV
Published
2008-06
Volume
379
Issue
4
Pages
787-802
ISSN
0022-2836 (ISSN-L)
OpenAlex
W2071919488
Cited by
162
References
56
Citations by year
2026: 3 · 2025: 5 · 2024: 13 · 2023: 9 · 2022: 10 · 2021: 4 · 2020: 8 · 2019: 5 · 2018: 7 · 2017: 8 · 2016: 5 · 2015: 10 · 2014: 16 · 2013: 14 · 2012: 9
FWCI
5.08
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Molecular Biology (publishedVersion)
  • PubMed (publishedVersion)
  • NPARC (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Physical Sciences › Computer Science › Computational Theory and Mathematics › Computational Drug Discovery Methods
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Chemical Physics Studies
Keywords
protein-protein interaction, MAPK signaling, alanine scanning, MM-GBSA, yeast two-hybrid, small molecule hits
MeSH terms
Binding Sites, Models, Molecular, Proteins, Recombinant Proteins, Thermodynamics, Mutagenesis, Site-Directed, Crystallography, X-Ray, Amino Acid Substitution, Two-Hybrid System Techniques, MAP Kinase Signaling System, Multiprotein Complexes, Adaptor Proteins, Signal Transducing, Protein Interaction Domains and Motifs

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