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Protein oligomerization and mobility within the nuclear envelope evaluated by the time-shifted mean-segmented Q factor.

ABSTRACT: Analysis of fluorescence fluctuation experiments by the mean-segmented Q (MSQ) method was recently used to successfully characterize the oligomeric state and mobility of proteins within the nuclear envelope (NE) of living cells. However, two significant shortcomings of MSQ were recognized. Non-ideal detector behavior due to dead-time and afterpulsing as well as the lack of error analysis currently limit the potential of MSQ. This paper presents time-shifted MSQ (tsMSQ), a new formulation of MSQ that is robust with respect to dead-time and afterpulsing. In addition, a protocol for performing error analysis on tsMSQ data is introduced to assess the quality of fit models and estimate the uncertainties of fit parameters. Together, these developments significantly simplify and improve the analysis of fluorescence fluctuation data taken within the NE. To demonstrate these new developments, tsMSQ was used to characterize the oligomeric state and mobility of the luminal domains of two inner nuclear membrane SUN proteins. The results for the luminal domain of SUN2 obtained through tsMSQ without correction for non-ideal detector effects agree with a recent study that was conducted using the original MSQ formulation. Finally, tsMSQ was applied to characterize the oligomeric state and mobility of the luminal domain of the germline-restricted SUN3.

SUBMITTER: Hennen J

PROVIDER: S-EPMC6401277 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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Protein oligomerization and mobility within the nuclear envelope evaluated by the time-shifted mean-segmented Q factor.

Hennen Jared J Hur Kwang-Ho KH Karuka Siddarth Reddy SR Luxton G W Gant GWG Mueller Joachim D JD

Methods (San Diego, Calif.) 20180928

Analysis of fluorescence fluctuation experiments by the mean-segmented Q (MSQ) method was recently used to successfully characterize the oligomeric state and mobility of proteins within the nuclear envelope (NE) of living cells. However, two significant shortcomings of MSQ were recognized. Non-ideal detector behavior due to dead-time and afterpulsing as well as the lack of error analysis currently limit the potential of MSQ. This paper presents time-shifted MSQ (tsMSQ), a new formulation of MSQ ...[more]

PMID: 30268407

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Project description:BACKGROUND:Sex presents evolutionary costs and benefits, leading to the expectation that the amount of genetic exchange should vary in conditions with contrasting cost-benefit equations. Like eukaryotes, viruses also engage in sex, but the rate of genetic exchange is often assumed to be a relatively invariant property of a particular virus. However, the rates of genetic exchange can vary within one type of virus according to geography, as highlighted by phylogeographic studies of cystoviruses. Here we merge environmental microbiology with experimental evolution to examine sex in a diverse set of cystoviruses, consisting of the bacteriophage ?6 and its relatives. To quantify reassortment we manipulated - by experimental evolution - electrophoretic mobility of intact virus particles for use as a phenotypic marker to estimate genetic exchange. RESULTS:We generated descendants of ?6 that exhibited fast and slow mobility during gel electrophoresis. We identified mutations associated with slow and fast phenotypes using whole genome sequencing and used crosses to establish the production of hybrids of intermediate mobility. We documented natural variation in electrophoretic mobility among environmental isolates of cystoviruses and used crosses against a common fast mobility ?6 strain to monitor the production of hybrids with intermediate mobility, thus estimating the amount of genetic exchange. Cystoviruses from different geographic locations have very different reassortment rates when measured against ?6, with viruses isolated from California showing higher reassortment rates than those from the Northeastern US. CONCLUSIONS:The results confirm that cystoviruses from different geographic locations have remarkably different reassortment rates -despite similar genome structure and replication mechanisms- and that these differences are in large part due to sexual reproduction. This suggests that particular viruses may indeed exhibit diverse sexual behavior, but wide geographic sampling, across varying environmental conditions may be necessary to characterize the full repertoire. Variation in reassortment rates can assist in the delineation of viral populations and is likely to provide insight into important viral evolutionary dynamics including the rate of coinfection, virulence, and host range shifts. Electrophoretic mobility may be an indicator of important determinants of fitness and the techniques herein can be applied to the study of other viruses.

Dataset Information

Protein oligomerization and mobility within the nuclear envelope evaluated by the time-shifted mean-segmented Q factor.

Publications

Protein oligomerization and mobility within the nuclear envelope evaluated by the time-shifted mean-segmented Q factor.

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