1
|
Fritz DI, Ding Y, Merrill-Skoloff G, Flaumenhaft R, Hanada T, Chishti AH. Dematin Regulates Calcium Mobilization, Thrombosis, and Early Akt Activation in Platelets. Mol Cell Biol 2023; 43:283-299. [PMID: 37216480 PMCID: PMC10251785 DOI: 10.1080/10985549.2023.2210033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 04/19/2023] [Accepted: 04/21/2023] [Indexed: 05/24/2023] Open
Abstract
The complex intrinsic and extrinsic pathways contributing to platelet activation profoundly impact hemostasis and thrombosis. Detailed cellular mechanisms that regulate calcium mobilization, Akt activation, and integrin signaling in platelets remain incompletely understood. Dematin is a broadly expressed actin binding and bundling cytoskeletal adaptor protein regulated by phosphorylation via cAMP-dependent protein kinase. Here, we report the development of a conditional mouse model specifically lacking dematin in platelets. Using the new mouse model termed PDKO, we provide direct evidence that dematin is a major regulator of calcium mobilization, and its genetic deletion inhibits the early phase of Akt activation in response to collagen and thrombin agonists in platelets. The aberrant platelet shape change, clot retraction, and in vivo thrombosis observed in PDKO mice will enable future characterization of dematin-mediated integrin activation mechanisms in thrombogenic as well as nonvascular pathologies.
Collapse
Affiliation(s)
- Daniel I. Fritz
- Programs in Cellular, Molecular and Developmental Biology, Graduate School of Biomedical Sciences, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Yiwen Ding
- Pharmacology and Drug Development, Graduate School of Biomedical Sciences, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Glenn Merrill-Skoloff
- Division of Hemostasis and Thrombosis, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Robert Flaumenhaft
- Division of Hemostasis and Thrombosis, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Toshihiko Hanada
- Department of Developmental, Molecular, and Chemical Biology, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Athar H. Chishti
- Department of Developmental, Molecular, and Chemical Biology, Tufts University School of Medicine, Boston, Massachusetts, USA
| |
Collapse
|
2
|
Unraveling axonal mechanisms of traumatic brain injury. Acta Neuropathol Commun 2022; 10:140. [PMID: 36131329 PMCID: PMC9494812 DOI: 10.1186/s40478-022-01414-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 07/18/2022] [Indexed: 11/28/2022] Open
Abstract
Axonal swellings (AS) are one of the neuropathological hallmark of axonal injury in several disorders from trauma to neurodegeneration. Current evidence proposes a role of perturbed Ca2+ homeostasis in AS formation, involving impaired axonal transport and focal distension of the axons. Mechanisms of AS formation, in particular moments following injury, however, remain unknown. Here we show that AS form independently from intra-axonal Ca2+ changes, which are required primarily for the persistence of AS in time. We further show that the majority of axonal proteins undergoing de/phosphorylation immediately following injury belong to the cytoskeleton. This correlates with an increase in the distance of the actin/spectrin periodic rings and with microtubule tracks remodeling within AS. Observed cytoskeletal rearrangements support axonal transport without major interruptions. Our results demonstrate that the earliest axonal response to injury consists in physiological adaptations of axonal structure to preserve function rather than in immediate pathological events signaling axonal destruction.
Collapse
|
3
|
Vugmeyster L, Griffin A, Ostrovsky D, Bhattacharya S, Nichols PJ, McKnight CJ, Vögeli B. Correlated motions of C'-N and C α-C β pairs in protonated and per-deuterated GB3. JOURNAL OF BIOMOLECULAR NMR 2018; 72:39-54. [PMID: 30121872 PMCID: PMC6218248 DOI: 10.1007/s10858-018-0205-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 08/09/2018] [Indexed: 06/08/2023]
Abstract
We investigated correlated µs-ms time scale motions of neighboring 13C'-15N and 13Cα-13Cβ nuclei in both protonated and perdeuterated samples of GB3. The techniques employed, NMR relaxation due to cross-correlated chemical shift modulations, specifically target concerted changes in the isotropic chemical shifts of the two nuclei associated with spatial fluctuations. Field-dependence of the relaxation rates permits identification of the parameters defining the chemical exchange rate constant under the assumption of a two-site exchange. The time scale of motions falls into the intermediate to fast regime (with respect to the chemical shift time scale, 100-400 s-1 range) for the 13C'-15N pairs and into the slow to intermediate regime for the 13Cα-13Cβ pairs (about 150 s-1). Comparison of the results obtained for protonated and deuterated GB3 suggests that deuteration has a tendency to reduce these slow scale correlated motions, especially for the 13Cα-13Cβ pairs.
Collapse
Affiliation(s)
- Liliya Vugmeyster
- Department of Chemistry, University of Colorado at Denver, 1201 Larimer Street, Denver, CO, 80204, USA.
| | - Aaron Griffin
- Department of Chemistry, University of Colorado at Denver, 1201 Larimer Street, Denver, CO, 80204, USA
| | - Dmitry Ostrovsky
- Department of Mathematics, University of Colorado at Denver, Denver, CO, 80204, USA
| | | | - Parker J Nichols
- Department of Biochemistry and Molecular Genetics, University of Colorado, School of Medicine, Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - C James McKnight
- Department of Physiology and Biophysics, Boston University School of Medicine, Boston, MA, 02118, USA
| | - Beat Vögeli
- Department of Biochemistry and Molecular Genetics, University of Colorado, School of Medicine, Anschutz Medical Campus, Aurora, CO, 80045, USA
| |
Collapse
|
4
|
Vögeli B, Vugmeyster L. Distance-independent Cross-correlated Relaxation and Isotropic Chemical Shift Modulation in Protein Dynamics Studies. Chemphyschem 2018; 20:178-196. [PMID: 30110510 DOI: 10.1002/cphc.201800602] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Indexed: 01/09/2023]
Abstract
Cross-correlated relaxation (CCR) in multiple-quantum coherences differs from other relaxation phenomena in its theoretical ability to be mediated across an infinite distance. The two interfering relaxation mechanisms may be dipolar interactions, chemical shift anisotropies, chemical shift modulations or quadrupolar interactions. These properties make multiple-quantum CCR an attractive probe for structure and dynamics of biomacromolecules not accessible from other measurements. Here, we review the use of multiple-quantum CCR measurements in dynamics studies of proteins. We compile a list of all experiments proposed for CCR rate measurements, provide an overview of the theory with a focus on protein dynamics, and present applications to various protein systems.
Collapse
Affiliation(s)
- Beat Vögeli
- Department of Biochemistry and Molecular Genetics, University of Colorado at Denver, 12801 East 17th Avenue, Aurora, CO, 80045, United States
| | - Liliya Vugmeyster
- Department of Chemistry, University of Colorado at Denver, 1201 Laurimer Street Denver, CO, 80204, United States
| |
Collapse
|
5
|
Vögeli B. Cross-correlated relaxation rates between protein backbone H-X dipolar interactions. JOURNAL OF BIOMOLECULAR NMR 2017; 67:211-232. [PMID: 28286915 DOI: 10.1007/s10858-017-0098-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2017] [Accepted: 02/19/2017] [Indexed: 06/06/2023]
Abstract
The relaxation interference between dipole-dipole interactions of two separate spin pairs carries structural and dynamics information. In particular, when compared to individual dynamic behavior of those spin pairs, such cross-correlated relaxation (CCR) rates report on the correlation between the spin pairs. We have recently mapped out correlated motion along the backbone of the protein GB3, using CCR rates among and between consecutive HN-N and Hα-Cα dipole-dipole interactions. Here, we provide a detailed account of the measurement of the four types of CCR rates. All rates were obtained from at least two different pulse sequences, of which the yet unpublished ones are presented. Detailed comparisons between the different methods and corrections for unwanted pathways demonstrate that the averaged CCR rates are highly accurate and precise with errors of 1.5-3% of the entire value ranges.
Collapse
Affiliation(s)
- Beat Vögeli
- Department of Biochemistry and Molecular Genetics, University of Colorado Denver, Research Center 1 South, Room 9103, 12801 East 17th Avenue, Aurora, CO, 80045, USA.
| |
Collapse
|
6
|
Brown JW, Farelli JD, McKnight CJ. On the unyielding hydrophobic core of villin headpiece. Protein Sci 2012; 21:647-54. [PMID: 22467489 DOI: 10.1002/pro.2048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 02/09/2012] [Accepted: 02/13/2012] [Indexed: 11/06/2022]
Abstract
Villin headpiece (HP67) is a small, autonomously-folding domain that has become a model system for understanding the fundamental tenets governing protein folding. In this communication, we explore the role that Leu61 plays in the structure and stability of the construct. Deletion of Leu61 results in a completely unfolded protein that cannot be expressed in Escherichia coli. Omission of only the aliphatic leucine side chain (HP67 L61G) perturbed neither the backbone conformation nor the orientation of local hydrophobic side chains. As a result, a large, solvent-exposed hydrophobic pocket, a negative replica of the leucine side-chain, was created on the surface. The loss of the hydrophobic interface between leucine 61 and the hydrophobic pocket destabilized the construct by ~3.3 kcal/mol. Insertion of a single glycine residue immediately before Leu61 (HP67 L61[GL]) was also highly destabilizing and had the effect of altering the backbone conformation (α-helix to π-helix) in order to precisely preserve the wild-type position and conformation of all hydrophobic residues, including Leu61. In addition to demonstrating that the hydrophobic side-chain of Leu61 is critically important for the stability of villin headpiece, our results are consistent with the notion that the precise interactions present within the hydrophobic core, rather than the hydrogen bonds that define the secondary structure, specify a protein's fold.
Collapse
Affiliation(s)
- Jeffrey W Brown
- Department of Physiology and Biophysics, Boston University School of Medicine, Boston, Massachusetts 02118, USA
| | | | | |
Collapse
|
7
|
Vugmeyster L, Ostrovsky D, Li Y. Comparison of fast backbone dynamics at amide nitrogen and carbonyl sites in dematin headpiece C-terminal domain and its S74E mutant. JOURNAL OF BIOMOLECULAR NMR 2010; 47:155-162. [PMID: 20396930 DOI: 10.1007/s10858-010-9417-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Accepted: 03/29/2010] [Indexed: 05/29/2023]
Abstract
We perform a detailed comparison of fast backbone dynamics probed at amide nitrogen versus carbonyl carbon sites for dematin headpiece C-terminal domain (DHP) and its S74E mutant (DHPS74E). Carbonyl dynamics is probed via auto-correlated longitudinal rates and transverse C'/C'-C(alpha) CSA/dipolar and C'/C'-N CSA/dipolar cross-correlated rates, while (15)N data are taken from a previous study. Resulting values of effective order parameters and internal correlation times support the conclusion that C' relaxation reports on a different subset of fast motions compared to those probed at N-H bond vectors in the same peptide planes. (13)C' order parameters are on the average 0.08 lower than (15)N order parameters with the exception of the flexible loop region in DHP. The reduction of mobility in the loop region upon the S74E mutation can be seen from the (15)N order parameters but not from the (13)C order parameters. Internal correlation times at (13)C' sites are on the average an order of magnitude longer than those at (15)N sites for the well-structured C-terminal subdomains, while the more flexible N-terminal subdomains have more comparable average internal correlation times.
Collapse
Affiliation(s)
- Liliya Vugmeyster
- Department of Chemistry and Environment and Natural Resources Institute, University of Alaska at Anchorage, 3211 Providence Drive, Anchorage, AK 99508, USA.
| | | | | |
Collapse
|
8
|
Vugmeyster L. Slow backbone dynamics of chicken villin headpiece subdomain probed by NMR C'-N cross-correlated relaxation. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2009; 47:746-751. [PMID: 19479944 DOI: 10.1002/mrc.2456] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have investigated slow correlated motions of neighboring carbonyl and nitrogen nuclei in the backbone of chicken villin headpiece subdomain. Cross-correlated chemical shift modulation experiments were performed at three temperatures where the protein remains in its folded state. The results at 8 degrees C demonstrate the presence of microseconds to milliseconds timescale motions for a number of residues belonging both to helices and unstructured regions. As the temperature is raised, the motions become progressively less visible. The reduction of the contributions of slow motions into the cross-correlated relaxation rate with the rise in temperature is caused by the increase of the chemical exchange rate constants for the slow motion processes.
Collapse
Affiliation(s)
- Liliya Vugmeyster
- Department of Chemistry, University of Alaska Anchorage, 3211 Providence Drive, Anchorage, AK 99508, USA.
| |
Collapse
|