The utilization of several sugars in Escherichia coli is regulated by the Phosphotransferase System (PTS), in which diverse sugar utilization modules compete for phosphoryl flux from the general PTS proteins. Existing theoretical work predicts a winner-take-all outcome when this flux limits carbon uptake. To date, no experimental work has interrogated competing PTS uptake modules with single-cell resolution. Using time-lapse microscopy in perfused microchannels, we analyzed the competition between N-acetyl-glucosamine and sorbitol, as representative PTS sugars, by measuring both the expression of their utilization systems and the concomitant impact of sugar utilization on growth rates. We find two distinct regimes: hierarchical usage of the carbohydrates, and co-expression of the genes for both systems. Simulations of a mathematical model incorporating asymmetric sugar quality reproduce our metabolic phase diagram, indicating that under conditions of nonlimiting phosphate flux, co-expression is due to uncoupling of both sugar utilization systems. Our model reproduces hierarchical winner-take-all behaviour and stochastic co-expression, and predicts the switching between both strategies as a function of available phosphate flux. Hence, experiments and theory both suggest that PTS sugar utilization involves not only switching between the sugars utilized but also switching of utilization strategies to accommodate prevailing environmental conditions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1111/mmi.13329 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The predictive value of triglyceride-glucose index combined with non-high-density lipoprotein cholesterol in coronary heart disease.
BMC Cardiovasc Disord
January 2025
Department of Cardiology, Yiwu Central Hospital, 699 Jiangdong Road, Yiwu, Zhejiang, 322000, China.
Background And Aims: To explore the predictive value of the triglyceride-glucose(TyG)index combined with non-high-density lipoprotein cholesterol (Non-HDL-C) in coronary atherosclerotic heart disease (CHD).
Methods And Results: We retrospectively collected patients who were suspected of CHD and underwent coronary angiography in Yiwu Central Hospital and collected medical history, other serum biochemical evaluation and echocardiography from the enrolled population, Non-HDL-C and TyG indices were calculated, and their correlation with Gensini score was analyzed. Logistic regression analysis was used to analyze the risk factors of coronary heart disease, and ROC curves were plotted to assess the predictive value of CHD in subjects with single or multiple indices.
The influencing factors of cognitive impairment in elderly individuals in Chengdu city: a cross-sectional study based on AD8.
BMC Geriatr
January 2025
Unit 4-Department of Geriatric Medicine, the Fourth People's Hospital of Chengdu, Chengdu City, China.
Background: With the aging of society, cognitive impairment in elderly people is becoming increasingly common and has caused major public health problems. The screening of cognitive impairment in elderly people and its related influencing factors can aid in the development of relevant intervention and improvement strategies.
Methods: In this study, stratified random cluster sampling was used to conduct a cross-sectional survey of elderly individuals aged 65 years in Chengdu, Sichuan Province, through an electronic questionnaire from November 2022 to November 2023.
Hemoglobin glycation index and mortality risk in metabolic dysfunction-associated steatotic liver disease patients: a novel U-shaped association.
Sci Rep
January 2025
Xiyuan Hospital, China Academy of Chinese Medicine Sciences, Beijing, 100091, China.
Identifying dependable prognostic indicators is essential for the efficient management of metabolic dysfunction-associated steatotic liver disease (MASLD). The index of hemoglobin glycation (HGI) has been demonstrated to be closely linked to the onset and advancement of MASLD. Currently, no studies have investigated the relationship between HGI and mortality rates among MASLD patients.
View Article and Find Full Text PDFEngineering high-activity crosslinked enzyme aggregates via SpyCatcher/SpyTag-mediated self-assembly.
Int J Biol Macromol
January 2025
College of Forestry, Northwest A&F University, No.3 Taicheng Road, Yangling, Shaanxi 712100, China; Shaanxi Key Laboratory of Economic Plant Resources Development and Utilization, Yangling, Shaanxi 712100, China. Electronic address:
Crosslinked Enzyme Aggregates (CLEAs) are favored for their operational stability and recyclability. However, the traditional CLEAs preparation may distort the enzyme's active site and reduce activity. Therefore, we developed a universally applicable crosslinked SpyCatcher scaffold system designed for the facile preparation of CLEAs.
View Article and Find Full Text PDFBiomarkers.
Alzheimers Dement
December 2024
University of Southern California, Los Angeles, CA, USA.
Background: The apolipoprotein E (ApoE) Ɛ4 allele is associated with a significant risk for both late-onset Alzheimer's Disease (AD) development and cerebral amyloidosis, but the degree to which cerebrospinal fluid (CSF) apoE glycosylation affects disease progression is unclear. The objective of this study was to examine the relationship of CSF apoE glycosylation with t-tau, p-tau181, and Aβ1-42 CSF levels, and to delineate the effect of the APOE4+ genotype (vs E4-) on glycosylation.
Method: Total glycosylation and apoE isoform-specific glycosylation were analyzed in baseline plasma and CSF samples from a longitudinal cohort of older individuals (n=188, ages 55 - 89) from the Alzheimer's Disease Neuroimaging Initiative (ADNI).
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!