|
1
|
Abstract
Understanding how the crowded and complex cellular milieu affects protein stability and dynamics has only recently become possible by using techniques such as in-cell nuclear magnetic resonance. However, the combination of stabilizing and destabilizing interactions makes simple predictions difficult. Here we show the potential of Danio rerio oocytes as an in-cell nuclear magnetic resonance model that can be widely used to measure protein stability and dynamics. We demonstrate that in eukaryotic oocytes, which are 3-6-fold less crowded than other cell types, attractive chemical interactions still dominate effects on protein stability and slow tumbling times, compared to the effects of dilute buffer.
Collapse
Affiliation(s)
- Joseph F Thole
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Tanner C Fadero
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Jeffrey P Bonin
- Department of Biochemistry and Biophysics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Samantha S Stadmiller
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Jonathan A Giudice
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Gary J Pielak
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.,Department of Biochemistry and Biophysics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.,Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.,Integrative Program for Biological and Genome Sciences, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| |
Collapse
|
|
2
|
Fadero TC, Gerbich TM, Rana K, Suzuki A, DiSalvo M, Schaefer KN, Heppert JK, Boothby TC, Goldstein B, Peifer M, Allbritton NL, Gladfelter AS, Maddox AS, Maddox PS. LITE microscopy: Tilted light-sheet excitation of model organisms offers high resolution and low photobleaching. J Cell Biol 2018; 217:1869-1882. [PMID: 29490939 PMCID: PMC5940309 DOI: 10.1083/jcb.201710087] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 01/26/2018] [Accepted: 02/16/2018] [Indexed: 11/22/2022] Open
Abstract
Fadero et al. present lateral interference tilted excitation (LITE) microscopy–a tilted light-sheet method to illuminate high-numerical-aperture objectives for fluorescence microscopy. LITE can be implemented unobtrusively on most microscope systems and combines low photodamage with high resolution and efficient detection in imaging fluorescent organisms. Fluorescence microscopy is a powerful approach for studying subcellular dynamics at high spatiotemporal resolution; however, conventional fluorescence microscopy techniques are light-intensive and introduce unnecessary photodamage. Light-sheet fluorescence microscopy (LSFM) mitigates these problems by selectively illuminating the focal plane of the detection objective by using orthogonal excitation. Orthogonal excitation requires geometries that physically limit the detection objective numerical aperture (NA), thereby limiting both light-gathering efficiency (brightness) and native spatial resolution. We present a novel live-cell LSFM method, lateral interference tilted excitation (LITE), in which a tilted light sheet illuminates the detection objective focal plane without a sterically limiting illumination scheme. LITE is thus compatible with any detection objective, including oil immersion, without an upper NA limit. LITE combines the low photodamage of LSFM with high resolution, high brightness, and coverslip-based objectives. We demonstrate the utility of LITE for imaging animal, fungal, and plant model organisms over many hours at high spatiotemporal resolution.
Collapse
Affiliation(s)
- Tanner C Fadero
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Therese M Gerbich
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Kishan Rana
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Aussie Suzuki
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Matthew DiSalvo
- Joint Department of Biomedical Engineering, The University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill and Raleigh, NC
| | - Kristina N Schaefer
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Jennifer K Heppert
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Thomas C Boothby
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Bob Goldstein
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Mark Peifer
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Nancy L Allbritton
- Joint Department of Biomedical Engineering, The University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill and Raleigh, NC
| | - Amy S Gladfelter
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Amy S Maddox
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Paul S Maddox
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| |
Collapse
|
|
3
|
Abstract
Iodixanol provides an easy and affordable solution to a problem that has limited resolution and brightness when imaging living samples.
Collapse
Affiliation(s)
- Tanner C Fadero
- Biology Department, University of North Carolina at Chapel Hill, Chapel Hill, United States
| | - Paul S Maddox
- Biology Department, University of North Carolina at Chapel Hill, Chapel Hill, United States
| |
Collapse
|