1
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Characterizing the protein-protein interaction between MDM2 and 14-3-3σ; proof of concept for small molecule stabilization. J Biol Chem 2024; 300:105651. [PMID: 38237679 PMCID: PMC10864208 DOI: 10.1016/j.jbc.2024.105651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 12/01/2023] [Accepted: 01/01/2024] [Indexed: 02/10/2024] Open
Abstract
Mouse Double Minute 2 (MDM2) is a key negative regulator of the tumor suppressor protein p53. MDM2 overexpression occurs in many types of cancer and results in the suppression of WT p53. The 14-3-3 family of adaptor proteins are known to bind MDM2 and the 14-3-3σ isoform controls MDM2 cellular localization and stability to inhibit its activity. Therefore, small molecule stabilization of the 14-3-3σ/MDM2 protein-protein interaction (PPI) is a potential therapeutic strategy for the treatment of cancer. Here, we provide a detailed biophysical and structural characterization of the phosphorylation-dependent interaction between 14-3-3σ and peptides that mimic the 14-3-3 binding motifs within MDM2. The data show that di-phosphorylation of MDM2 at S166 and S186 is essential for high affinity 14-3-3 binding and that the binary complex formed involves one MDM2 di-phosphorylated peptide bound to a dimer of 14-3-3σ. However, the two phosphorylation sites do not simultaneously interact so as to bridge the 14-3-3 dimer in a 'multivalent' fashion. Instead, the two phosphorylated MDM2 motifs 'rock' between the two binding grooves of the dimer, which is unusual in the context of 14-3-3 proteins. In addition, we show that the 14-3-3σ-MDM2 interaction is amenable to small molecule stabilization. The natural product fusicoccin A forms a ternary complex with a 14-3-3σ dimer and an MDM2 di-phosphorylated peptide resulting in the stabilization of the 14-3-3σ/MDM2 PPI. This work serves as a proof-of-concept of the drugability of the 14-3-3/MDM2 PPI and paves the way toward the development of more selective and efficacious small molecule stabilizers.
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2
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Tracking the mechanism of covalent molecular glue stabilization using native mass spectrometry. Chem Sci 2023; 14:6756-6762. [PMID: 37350830 PMCID: PMC10284121 DOI: 10.1039/d3sc01732j] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 05/30/2023] [Indexed: 06/24/2023] Open
Abstract
Molecular glues are powerful tools for the control of protein-protein interactions. Yet, the mechanisms underlying multi-component protein complex formation remain poorly understood. Native mass spectrometry (MS) detects multiple protein species simultaneously, providing an entry to elucidate these mechanisms. Here, for the first time, covalent molecular glue stabilization was kinetically investigated by combining native MS with biophysical and structural techniques. This approach elucidated the stoichiometry of a multi-component protein-ligand complex, the assembly order, and the contributions of covalent versus non-covalent binding events that govern molecular glue activity. Aldehyde-based molecular glue activity is initially regulated by cooperative non-covalent binding, followed by slow covalent ligation, further enhancing stabilization. This study provides a framework to investigate the mechanisms of covalent small molecule ligation and informs (covalent) molecular glue development.
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3
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Abstract
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Protein post-translational
modifications (PTMs) enable cells to
rapidly change in response to biological stimuli. With hundreds of
different PTMs, understanding these control mechanisms is complex.
To date, efforts have focused on investigating the effect of a single
PTM on protein function. Yet, many proteins contain multiple PTMs.
Moreover, one PTM can alter the prevalence of another, a phenomenon
termed PTM crosstalk. Understanding PTM crosstalk is critical; however,
its detection is challenging since PTMs occur substoichiometrically.
Here, we develop an enrichment-free, label-free proteomics method
that utilizes high-field asymmetric ion mobility spectrometry (FAIMS)
to enhance the detection of PTM crosstalk. We show that by searching
for multiple combinations of dynamic PTMs on peptide sequences, a
6-fold increase in candidate PTM crosstalk sites is identified compared
with that of standard liquid chromatography-tandem mass spectrometry
(LC-MS/MS) workflows. Additionally, by cycling through FAIMS compensation
voltages within a single LC-FAIMS-MS/MS run, we show that our LC-FAIMS-MS/MS
workflow can increase multi-PTM-containing peptide identifications
without additional increases in run times. With 159 novel candidate
crosstalk sites identified, we envisage LC-FAIMS-MS/MS to play an
important role in expanding the repertoire of multi-PTM identifications.
Moreover, it is only by detecting PTM crosstalk that we can “see”
the full picture of how proteins are regulated.
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4
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Probing heavy metal binding to phycobiliproteins. FEBS J 2022; 289:4646-4656. [PMID: 35156751 PMCID: PMC9542875 DOI: 10.1111/febs.16396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 01/31/2022] [Accepted: 02/11/2022] [Indexed: 01/26/2023]
Abstract
Blue-green algae, also known as cyanobacteria, contain some of the most efficient light-harvesting complexes known. These large, colourful complexes consist of phycobiliproteins which are extremely valuable in the cosmetics, food, nutraceutical and pharmaceutical industries. Additionally, the colourful and fluorescent properties of phycobiliproteins can be modulated by metal ions, making them highly attractive as heavy metal sensors and heavy metal scavengers. Although the overall quenching ability metal ions have on phycobiliproteins is known, the mechanism of heavy metal binding to phycobiliproteins is not fully understood, limiting their widespread quantitative applications. Here, we show using high-resolution native mass spectrometry that phycobiliprotein complexes bind metal ions in different manners. Through monitoring the binding equilibria and metal-binding stoichiometry, we show in particular copper and silver to have drastic, yet different effects on phycobiliprotein structure, both copper and silver modulate the overall complex properties. Together, the data reveals the mechanisms by which metal ions can modulate phycobiliprotein properties which can be used as a basis for the future design of metal-related phycobiliprotein applications.
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5
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Structural proteomics and protein complexes - special issue. Proteomics 2021; 21:e2000286. [PMID: 34779105 DOI: 10.1002/pmic.202000286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 09/24/2021] [Indexed: 11/06/2022]
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6
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Abstract
Cyanobacteria have evolved over billions of years to adapt and survive in diverse climates. Environmentally, this presents a huge challenge because cyanobacteria can now rapidly form algae blooms that are detrimental to aquatic life. In addition, many cyanobacteria produce toxins, making them hazardous to animals and humans that they encounter. Rapid identification of cyanobacteria is essential to monitor and prevent toxic algae blooms. Here, we show for the first time how native mass spectrometry can quickly and precisely identify cyanobacteria from diverse aquatic environments. By monitoring phycobiliproteins, abundant protein complexes within cyanobacteria, simple, easy-to-understand mass spectral "fingerprints" were created that were unique to each species. Moreover, our method is 10-fold more sensitive than the current MALDI-TOF mass spectrometric methods, meaning that cyanobacteria can be monitored using this technology prior to bloom formation. Together, the data show great promise for the simultaneous detection and identification of co-existing cyanobacteria in situ.
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7
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Discovering protein-protein interaction stabilisers by native mass spectrometry. Chem Sci 2021; 12:10724-10731. [PMID: 34447561 PMCID: PMC8372317 DOI: 10.1039/d1sc01450a] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 06/10/2021] [Indexed: 11/21/2022] Open
Abstract
Protein-protein interactions (PPIs) are key therapeutic targets. Most PPI-targeting drugs in the clinic inhibit these important interactions; however, stabilising PPIs is an attractive alternative in cases where a PPI is disrupted in a disease state. The discovery of novel PPI stabilisers has been hindered due to the lack of tools available to monitor PPI stabilisation. Moreover, for PPI stabilisation to be detected, both the stoichiometry of binding and the shift this has on the binding equilibria need to be monitored simultaneously. Here, we show the power of native mass spectrometry (MS) in the rapid search for PPI stabilisers. To demonstrate its capability, we focussed on three PPIs between the eukaryotic regulatory protein 14-3-3σ and its binding partners estrogen receptor ERα, the tumour suppressor p53, and the kinase LRRK2, whose interactions upon the addition of a small molecule, fusicoccin A, are differentially stabilised. Within a single measurement the stoichiometry and binding equilibria between 14-3-3 and each of its binding partners was evident. Upon addition of the fusicoccin A stabiliser, a dramatic shift in binding equilibria was observed with the 14-3-3:ERα complex compared with the 14-3-3:p53 and 14-3-3:LRRK2 complexes. Our results highlight how native MS can not only distinguish the ability of stabilisers to modulate PPIs, but also give important insights into the dynamics of ternary complex formation. Finally, we show how native MS can be used as a screening tool to search for PPI stabilisers, highlighting its potential role as a primary screening technology in the hunt for novel therapeutic PPI stabilisers.
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8
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Loss of CRMP2 O-GlcNAcylation leads to reduced novel object recognition performance in mice. Open Biol 2019; 9:190192. [PMID: 31771416 PMCID: PMC6893399 DOI: 10.1098/rsob.190192] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 11/05/2019] [Indexed: 12/14/2022] Open
Abstract
O-GlcNAcylation is an abundant post-translational modification in the nervous system, linked to both neurodevelopmental and neurodegenerative disease. However, the mechanistic links between these phenotypes and site-specific O-GlcNAcylation remain largely unexplored. Here, we show that Ser517 O-GlcNAcylation of the microtubule-binding protein Collapsin Response Mediator Protein-2 (CRMP2) increases with age. By generating and characterizing a Crmp2S517A knock-in mouse model, we demonstrate that loss of O-GlcNAcylation leads to a small decrease in body weight and mild memory impairment, suggesting that Ser517 O-GlcNAcylation has a small but detectable impact on mouse physiology and cognitive function.
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9
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Subunit pI Can Influence Protein Complex Dissociation Characteristics. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:1389-1395. [PMID: 31077092 PMCID: PMC6669198 DOI: 10.1007/s13361-019-02198-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 03/12/2019] [Accepted: 03/12/2019] [Indexed: 05/05/2023]
Abstract
Mass spectrometry is frequently used to determine protein complex topology. By combining in-solution and gas-phase dissociation measurements, information can be indirectly inferred about the original composition of the protein complex. Although the mechanisms behind gas-phase complex dissociation are becoming more established, protein complex dissociation is not always predictable. Here, we looked into the effect of the protein subunits pI on complex dissociation. We chose two structurally similar, hexameric protein complexes that consist of a ring of alternating alpha and beta subunits. For one complex, allophycocyanin, the alpha and beta subunits are structurally similar, almost identical in mass, but have distinct pIs. In contrast, the other complex, phycoerythrin, is structural similar to allophycocyanin, yet the subunits have identical pIs. As predicted based on the structural arrangement, dissociation of phycoerythrin resulted in the observation of both the alpha and beta monomeric subunits in the mass spectrometer. However, for allophycocyanin, the results differed dramatically, with only the alpha monomeric subunit being detected upon gas-phase dissociation. Together, the results highlighted the importance of considering the isoelectric points of individual subunits within a protein complex when using tandem mass spectrometry data to elucidate protein complex topology.
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10
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Evidence for phospholipid export from the bacterial inner membrane by the Mla ABC transport system. Nat Microbiol 2019; 4:1692-1705. [DOI: 10.1038/s41564-019-0481-y] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 05/03/2019] [Indexed: 12/24/2022]
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11
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Crosstalk between phosphorylation and O‐Glc
NA
cylation: friend or foe. FEBS J 2018; 285:3152-3167. [DOI: 10.1111/febs.14491] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 03/27/2018] [Accepted: 04/26/2018] [Indexed: 12/13/2022]
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12
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Connecting color with assembly in the fluorescent B‐phycoerythrin protein complex. FEBS J 2017; 285:178-187. [DOI: 10.1111/febs.14331] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 10/23/2017] [Accepted: 11/13/2017] [Indexed: 01/20/2023]
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13
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14
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Phosphate Transfer in Activated Protein Complexes Reveals Interaction Sites. Angew Chem Int Ed Engl 2017; 56:13641-13644. [PMID: 28869719 DOI: 10.1002/anie.201706749] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 08/17/2017] [Indexed: 01/10/2023]
Abstract
For many proteins, phosphorylation regulates their interaction with other biomolecules. Herein, we describe an unexpected phenomenon whereby phosphate groups are transferred non-enzymatically from one interaction partner to the other within a binding interface upon activation in the gas phase. Providing that a high affinity exists between the donor and acceptor sites, this phosphate transfer is very efficient and the phosphate groups only ligate to sites in proximity to the binding region. Consequently, such phosphate-transfer reactions may define with high precision the binding site between a phosphoprotein and its binding partner, as well as reveal that the binding site in this system is retained in the phase transfer from solution to the gas phase.
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15
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Abstract
Proteins can be modified by multiple posttranslational modifications (PTMs), creating a PTM code that controls the function of proteins in space and time. Unraveling this complex PTM code is one of the great challenges in molecular biology. Here, using mass spectrometry-based assays, we focus on the most common PTMs-phosphorylation and O-GlcNAcylation-and investigate how they affect each other. We demonstrate two generic crosstalk mechanisms. First, we define a frequently occurring, very specific and stringent phosphorylation/O-GlcNAcylation interplay motif, (pSp/T)P(V/A/T)(gS/gT), whereby phosphorylation strongly inhibits O-GlcNAcylation. Strikingly, this stringent motif is substantially enriched in the human (phospho)proteome, allowing us to predict hundreds of putative O-GlcNAc transferase (OGT) substrates. A set of these we investigate further and show them to be decent substrates of OGT, exhibiting a negative feedback loop when phosphorylated at the P-3 site. Second, we demonstrate that reciprocal crosstalk does not occur at PX(S/T)P sites, i.e., at sites phosphorylated by proline-directed kinases, which represent 40% of all sites in the vertebrate phosphoproteomes.
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16
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Abstract
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O-GlcNAcylation is one of the most
abundant metazoan nuclear-cytoplasmic post-translational modifications.
Proteins modified by O-GlcNAc play key cellular roles in signaling,
transcription, metabolism, and cell division. Mechanistic studies
on protein O-GlcNAcylation are hampered by the lack of methods that
can simultaneously quantify O-GlcNAcylation, determine its stoichiometry,
and monitor O-GlcNAcylation kinetics. Here, we demonstrate that high-resolution
native mass spectrometry can be employed to monitor the small mass
shifts induced by modification by O-GlcNAc on two known protein substrates,
CK2α and TAB1, without the need for radioactive labeling or
chemoenzymatic tagging using large mass tags. Limited proteolysis
enabled further localization of the O-GlcNAc sites. In peptide-centric
MS analysis, the O-GlcNAc moiety is known to be easily lost. In contrast,
we demonstrate that the O-GlcNAc is retained under native MS conditions,
enabling precise quantitative analysis of stoichiometry and O-GlcNAcylation
kinetics. Together, the data highlight that high resolution native
MS may provide an alternative tool to monitor kinetics on one of the
most labile of protein post-translational modifications, in an efficient,
reliable, and quantitative manner.
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17
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Native Mass Spectrometry: What is in the Name? JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:5-13. [PMID: 32020797 DOI: 10.1021/jasms.8b05378] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electrospray ionization mass spectrometry (ESI-MS) is nowadays one of the cornerstones of biomolecular mass spectrometry and proteomics. Advances in sample preparation and mass analyzers have enabled researchers to extract much more information from biological samples than just the molecular weight. In particular, relevant for structural biology, noncovalent protein-protein and protein-ligand complexes can now also be analyzed by MS. For these types of analyses, assemblies need to be retained in their native quaternary state in the gas phase. This initial small niche of biomolecular mass spectrometry, nowadays often referred to as "native MS," has come to maturation over the last two decades, with dozens of laboratories using it to study mostly protein assemblies, but also DNA and RNA-protein assemblies, with the goal to define structure-function relationships. In this perspective, we describe the origins of and (re)define the term native MS, portraying in detail what we meant by "native MS," when the term was coined and also describing what it does (according to us) not entail. Additionally, we describe a few examples highlighting what native MS is, showing its successes to date while illustrating the wide scope this technology has in solving complex biological questions.
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18
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Native Mass Spectrometry: What is in the Name? JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:5-13. [PMID: 27909974 PMCID: PMC5174146 DOI: 10.1007/s13361-016-1545-3] [Citation(s) in RCA: 374] [Impact Index Per Article: 53.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 10/25/2016] [Accepted: 10/28/2016] [Indexed: 05/11/2023]
Abstract
Electrospray ionization mass spectrometry (ESI-MS) is nowadays one of the cornerstones of biomolecular mass spectrometry and proteomics. Advances in sample preparation and mass analyzers have enabled researchers to extract much more information from biological samples than just the molecular weight. In particular, relevant for structural biology, noncovalent protein-protein and protein-ligand complexes can now also be analyzed by MS. For these types of analyses, assemblies need to be retained in their native quaternary state in the gas phase. This initial small niche of biomolecular mass spectrometry, nowadays often referred to as "native MS," has come to maturation over the last two decades, with dozens of laboratories using it to study mostly protein assemblies, but also DNA and RNA-protein assemblies, with the goal to define structure-function relationships. In this perspective, we describe the origins of and (re)define the term native MS, portraying in detail what we meant by "native MS," when the term was coined and also describing what it does (according to us) not entail. Additionally, we describe a few examples highlighting what native MS is, showing its successes to date while illustrating the wide scope this technology has in solving complex biological questions. Graphical Abstract ᅟ.
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19
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Deciphering the Interplay among Multisite Phosphorylation, Interaction Dynamics, and Conformational Transitions in a Tripartite Protein System. ACS CENTRAL SCIENCE 2016; 2:445-55. [PMID: 27504491 PMCID: PMC4965854 DOI: 10.1021/acscentsci.6b00053] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Indexed: 05/11/2023]
Abstract
Multisite phosphorylation is a common pathway to regulate protein function, activity, and interaction pattern in vivo, but routine biochemical analysis is often insufficient to identify the number and order of individual phosphorylation reactions and their mechanistic impact on the protein behavior. Here, we integrate complementary mass spectrometry (MS)-based approaches to characterize a multisite phosphorylation-regulated protein system comprising Polo-like kinase 1 (Plk1) and its coactivators Aurora kinase A (Aur-A) and Bora, the interplay of which is essential for mitotic entry after DNA damage-induced cell cycle arrest. Native MS and cross-linking-MS revealed that Aur-A/Bora-mediated Plk1 activation is accompanied by the formation of Aur-A/Bora and Plk1/Bora heterodimers. We found that the Aur-A/Bora interaction is independent of the Bora phosphorylation state, whereas the Plk1/Bora interaction is dependent on extensive Bora multisite phosphorylation. Bottom-up and top-down proteomics analyses showed that Bora multisite phosphorylation proceeds via a well-ordered sequence of site-specific phosphorylation reactions, whereby we could reveal the involvement of up to 16 phosphorylated Bora residues. Ion mobility spectrometry-MS demonstrated that this multisite phosphorylation primes a substantial structural rearrangement of Bora, explaining the interdependence between extensive Bora multisite phosphorylation and Plk1/Bora complex formation. These results represent a first benchmark of our multipronged MS strategy, highlighting its potential to elucidate the mechanistic and structural implications of multisite protein phosphorylation.
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20
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Abstract
We report unexpected mass spectrometric observations of glycosylated human leukocyte antigen (HLA) class I-bound peptides. Complemented by molecular modeling, in vitro enzymatic assays, and oxonium ion patterns, we propose that the observed O-linked glycans carrying up to five monosaccharides are extended O-GlcNAc's rather than GalNAc-initiated O-glycans. A cytosolic O-GlcNAc modification is normally terminal and does not extend to produce a polysaccharide, but O-GlcNAc on an HLA peptide presents a special case because the loaded HLA class I complex traffics through the endoplasmic reticulum and Golgi apparatus on its way to the cell membrane and is hence exposed to glycosyltransferases. We also report for the first time natural HLA class I presentation of O- and N-linked glycopeptides derived from membrane proteins. HLA class I peptides with centrally located oligosaccharides have been shown to be immunogenic and may thus be important targets for immune surveillance.
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21
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Abstract
Protein interactions with glycolipids are implicated in diverse cellular processes. However, the study of protein-glycolipid complexes remains a significant experimental challenge. Here, we describe a powerful new assay that combines electrospray ionization mass spectrometry (ESI-MS) and picodiscs, which are composed of human sphingolipid activator protein saposin A and a small number of phospholipids, to display glycolipids in a lipid environment for protein-glycolipid interaction studies in aqueous solution. Time-resolved measurements of enzyme catalyzed hydrolysis of glycolipid substrates and the detection of low, moderate, and high affinity protein-glycolipid interactions serve to demonstrate the reliability and versatility of the assay.
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22
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Nanodiscs and Electrospray Ionization Mass Spectrometry: A Tool for Screening Glycolipids Against Proteins. Anal Chem 2014; 86:5271-7. [DOI: 10.1021/ac4041179] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Insights into the role of the beta-2 microglobulin D-strand in amyloid propensity revealed by mass spectrometry. MOLECULAR BIOSYSTEMS 2013; 10:412-20. [PMID: 24336936 PMCID: PMC4006425 DOI: 10.1039/c3mb70420c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Characterising the differences between oligomers formed from the amyloidogenic protein β2-microglobulin and its mutant H51A using ESI-IMS-MS.
In vivo beta-2 microglobulin (β2m) forms amyloid fibrils that are associated with the disease dialysis-related amyloidosis. Here, electrospray ionisation-ion mobility spectrometry-mass spectrometry has been used to compare the oligomers formed from wild-type β2m with those formed from a variant of the protein containing a single point mutation in the D strand, H51A, during in vitro fibril assembly. Using the amyloid-binding fluorescent dye, Thioflavin T, to monitor fibrillation kinetics, H51A was shown to exhibit a two-fold increase in the lag-time of fibril formation. Despite this, comparison of the oligomeric species observed during the lag-time of self-aggregation indicated that H51A had a higher population of oligomers, and formed oligomers of higher order, than wild-type β2m. The cross-sectional areas of the oligomers arising from H51A and wild-type protein were indistinguishable, although the H51A oligomers were shown to have a significantly higher kinetic stability on account of their reluctance to undergo sub-unit exchange when mixed with 15N-labelled protein. Together the data reveal a significant effect of His51, and thus that of the D-strand sequence, on amyloid formation. The results also highlight the power of mass spectrometry in probing complex biochemical mechanisms in real-time.
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24
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The role of chaperone-subunit usher domain interactions in the mechanism of bacterial pilus biogenesis revealed by ESI-MS. Mol Cell Proteomics 2012; 11:M111.015289. [PMID: 22371487 PMCID: PMC3394950 DOI: 10.1074/mcp.m111.015289] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Revised: 01/23/2012] [Indexed: 01/12/2023] Open
Abstract
The PapC usher is a β-barrel outer membrane protein essential for assembly and secretion of P pili that are required for adhesion of pathogenic E. coli, which cause the development of pyelonephritis. Multiple protein subunits form the P pilus, the highly specific assembly of which is coordinated by the usher. Despite a wealth of structural knowledge, how the usher catalyzes subunit polymerization and orchestrates a correct and functional order of subunit assembly remain unclear. Here, the ability of the soluble N-terminal (UsherN), C-terminal (UsherC2), and Plug (UsherP) domains of the usher to bind different chaperone-subunit (PapDPapX) complexes is investigated using noncovalent electrospray ionization mass spectrometry. The results reveal that each usher domain is able to bind all six PapDPapX complexes, consistent with an active role of all three usher domains in pilus biogenesis. Using collision induced dissociation, combined with competition binding experiments and dissection of the adhesin subunit, PapG, into separate pilin and adhesin domains, the results reveal why PapG has a uniquely high affinity for the usher, which is consistent with this subunit always being displayed at the pilus tip. In addition, we show how the different soluble usher domains cooperate to coordinate and control efficient pilus assembly at the usher platform. As well as providing new information about the protein-protein interactions that determine pilus biogenesis, the results highlight the power of noncovalent MS to interrogate biological mechanisms, especially in complex mixtures of species.
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MESH Headings
- Adhesins, Escherichia coli/chemistry
- Adhesins, Escherichia coli/genetics
- Adhesins, Escherichia coli/metabolism
- Bacterial Adhesion
- Binding Sites
- Binding, Competitive
- Escherichia coli/pathogenicity
- Escherichia coli/physiology
- Escherichia coli Proteins/chemistry
- Escherichia coli Proteins/genetics
- Escherichia coli Proteins/metabolism
- Fimbriae Proteins/chemistry
- Fimbriae Proteins/genetics
- Fimbriae Proteins/metabolism
- Fimbriae, Bacterial/chemistry
- Fimbriae, Bacterial/genetics
- Fimbriae, Bacterial/metabolism
- Models, Molecular
- Molecular Chaperones/chemistry
- Molecular Chaperones/genetics
- Molecular Chaperones/metabolism
- Periplasmic Proteins/chemistry
- Periplasmic Proteins/genetics
- Periplasmic Proteins/metabolism
- Porins/chemistry
- Porins/genetics
- Porins/metabolism
- Protein Binding
- Protein Structure, Tertiary
- Protein Subunits/chemistry
- Protein Subunits/genetics
- Protein Subunits/metabolism
- Recombinant Proteins/chemistry
- Recombinant Proteins/genetics
- Recombinant Proteins/metabolism
- Spectrometry, Mass, Electrospray Ionization
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25
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Second order rate constants of donor-strand exchange reveal individual amino acid residues important in determining the subunit specificity of pilus biogenesis. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2011; 22:1214-1223. [PMID: 21953104 PMCID: PMC3252035 DOI: 10.1007/s13361-011-0146-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Revised: 03/28/2011] [Accepted: 04/01/2011] [Indexed: 05/31/2023]
Abstract
P pili are hair-like adhesive structures that are assembled on the outer membrane (OM) of uropathogenic Escherichia coli by the chaperone-usher pathway. In this pathway, chaperone-subunit complexes are formed in the periplasm and targeted to an OM assembly platform, the usher. Pilus subunits display a large groove caused by a missing β-strand which, in the chaperone-subunit complex, is provided by the chaperone. At the usher, pilus subunits are assembled in a mechanism termed "donor-strand exchange (DSE)" whereby the β-strand provided by the chaperone is exchanged by the incoming subunit's N-terminal extension (Nte). This occurs in a zip-in-zip-out fashion, starting with a defined residue, P5, in the Nte inserting into a defined site in the groove, the P5 pocket. Here, electrospray ionization-mass spectrometry (ESI-MS) has been used to measure DSE rates in vitro. Second order rate constants between the chaperone-subunit complex and a range of Nte peptides substituted at different residues confirmed the importance of the P5 residue of the Nte in determining the rate of DSE. In addition, residues either side of the P5 residue (P5 + 1 and P5 - 1), the side-chains of which are directed away from the subunit groove, also modulate the rates of DSE, most likely by aiding the docking of the Nte into the P5 pocket on the accepting subunit prior to DSE. The ESI-MS approach developed is applicable to the measurement of rates of DSE in pilus biogenesis in general and demonstrates the scope of ESI-MS in determining biomolecular processes in molecular detail.
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