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Bryan NW, Ali A, Niedzialkowska E, Mayne L, Stukenberg PT, Black BE. Structural basis for the phase separation of the chromosome passenger complex. eLife 2024; 13:e92709. [PMID: 38456462 PMCID: PMC10977965 DOI: 10.7554/elife.92709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 03/07/2024] [Indexed: 03/09/2024] Open
Abstract
The physical basis of phase separation is thought to consist of the same types of bonds that specify conventional macromolecular interactions yet is unsatisfyingly often referred to as 'fuzzy'. Gaining clarity on the biogenesis of membraneless cellular compartments is one of the most demanding challenges in biology. Here, we focus on the chromosome passenger complex (CPC), that forms a chromatin body that regulates chromosome segregation in mitosis. Within the three regulatory subunits of the CPC implicated in phase separation - a heterotrimer of INCENP, Survivin, and Borealin - we identify the contact regions formed upon droplet formation using hydrogen/deuterium exchange mass spectrometry (HXMS). These contact regions correspond to some of the interfaces seen between individual heterotrimers within the crystal lattice they form. A major contribution comes from specific electrostatic interactions that can be broken and reversed through initial and compensatory mutagenesis, respectively. Our findings reveal structural insight for interactions driving liquid-liquid demixing of the CPC. Moreover, we establish HXMS as an approach to define the structural basis for phase separation.
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Affiliation(s)
- Nikaela W Bryan
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of PennsylvaniaPhiladelphiaUnited States
- Graduate Program in Biochemistry and Molecular Biophysics, University of PennsylvaniaPhiladelphiaUnited States
| | - Aamir Ali
- Department of Biochemistry and Molecular Genetics, University of VirginiaCharlottesvilleUnited States
| | - Ewa Niedzialkowska
- Department of Biochemistry and Molecular Genetics, University of VirginiaCharlottesvilleUnited States
| | - Leland Mayne
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of PennsylvaniaPhiladelphiaUnited States
| | - P Todd Stukenberg
- Department of Biochemistry and Molecular Genetics, University of VirginiaCharlottesvilleUnited States
| | - Ben E Black
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of PennsylvaniaPhiladelphiaUnited States
- Graduate Program in Biochemistry and Molecular Biophysics, University of PennsylvaniaPhiladelphiaUnited States
- Penn Center for Genome Integrity, Perelman School of Medicine, University of PennsylvaniaPhiladelphiaUnited States
- Epigenetics Institute, Perelman School of Medicine, University of PennsylvaniaPhiladelphiaUnited States
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Bryan NW, Ali A, Niedzialkowska E, Mayne L, Stukenberg PT, Black BE. Structural Basis for the Phase Separation of the Chromosome Passenger Complex. bioRxiv 2023:2023.05.22.541822. [PMID: 37292983 PMCID: PMC10245869 DOI: 10.1101/2023.05.22.541822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The physical basis of phase separation is thought to consist of the same types of bonds that specify conventional macromolecular interactions yet is unsatisfyingly often referred to as 'fuzzy'. Gaining clarity on the biogenesis of membraneless cellular compartments is one of the most demanding challenges in biology. Here, we focus on the chromosome passenger complex (CPC), that forms a chromatin body that regulates chromosome segregation in mitosis. Within the three regulatory subunits of the CPC implicated in phase separation - a heterotrimer of INCENP, Survivin, and Borealin - we identify the contact regions formed upon droplet formation using hydrogen/deuterium-exchange mass spectrometry (HXMS). These contact regions correspond to some of the interfaces seen between individual heterotrimers within the crystal lattice they form. A major contribution comes from specific electrostatic interactions that can be broken and reversed through initial and compensatory mutagenesis, respectively. Our findings reveal structural insight for interactions driving liquid-liquid demixing of the CPC. Moreover, we establish HXMS as an approach to define the structural basis for phase separation.
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Affiliation(s)
- Nikaela W. Bryan
- Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA, 19104
- Graduate Program in Biochemistry and Molecular Biophysics, University of Pennsylvania, Philadelphia, PA, 19104
| | - Aamir Ali
- Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA, 22904
| | - Ewa Niedzialkowska
- Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA, 22904
| | - Leland Mayne
- Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA, 19104
| | - P. Todd Stukenberg
- Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA, 22904
| | - Ben E. Black
- Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA, 19104
- Graduate Program in Biochemistry and Molecular Biophysics, University of Pennsylvania, Philadelphia, PA, 19104
- Penn Center for Genome Integrity, University of Pennsylvania, Philadelphia, PA, 19104
- Epigenetics Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104
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Bryan NW, Niedzialkowska E, Stukenberg PT, Black BE. Hydrogen‐Deuterium Exchange Identifies the Structural Basis of Phase Separation of the Chromosome Passenger Complex. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r5784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Nikaela W. Bryan
- Biochemistry and BiophysicsUniversity of PennsylvaniaPhiladelphiaPA
| | - Ewa Niedzialkowska
- Biochemistry and Molecular GeneticsUniversity of VirginiaCharlottesvilleVA
| | - P. T. Stukenberg
- Biochemistry and Molecular GeneticsUniversity of VirginiaCharlottesvilleVA
| | - Ben E. Black
- Biochemistry and BiophysicsUniversity of PennsylvaniaPhiladelphiaPA
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Abstract
Application of Buchwald-Hartwig catalysis for development of biologically relevant arylspirodiamine compounds is reported. This synthetic methodology requires no inert atmosphere and affords yields up to 93% in just 20 min. Linear and sterically hindered angular spirodiamines in salt and free-base form are coupled with electron-rich and -withdrawing aryl chlorides, demonstrating a broad scope and applicability of this protocol.
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Affiliation(s)
- Sean W Reilly
- Department of Radiology, Perelman School of Medicine, University of Pennsylvania, 231 S. 34th Street, Philadelphia, PA 19104, USA
| | - Nikaela W Bryan
- Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania, 421 Curie Blvd., Philadelphia, PA 19104, USA
| | - Robert H Mach
- Department of Radiology, Perelman School of Medicine, University of Pennsylvania, 231 S. 34th Street, Philadelphia, PA 19104, USA
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