Featured
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| Open AccessUsing a synthetic machinery to improve carbon yield with acetylphosphate as the core
In metabolic engineering, releasing of carbon in the form of CO2 leads to significant decrease of atomic economy. Here, the authors construct a carbon-conserving pathway, which converts glucose into acetyl phosphate without carbon loss, with oscillatory system to improve production of multiple target compounds.
- Likun Guo
- , Min Liu
- & Guang Zhao
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| Open AccessModular-designed engineered bacteria for precision tumor immunotherapy via spatiotemporal manipulation by magnetic field
Several strategies have been employed to enhance the tumor-targeting and anti-cancer properties of engineered bacteria. Here the authors describe the design of alternating magnetic field-manipulated bacteria engineered to release an anti-CD47 nanobody, promoting anti-tumor immune response in preclinical cancer models.
- Xiaotu Ma
- , Xiaolong Liang
- & Guangjun Nie
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Article
| Open AccessA plasmid system with tunable copy number
The range of available copy numbers for cloning vectors is largely restricted to the handful of ORIs that have been isolated from plasmids found in nature. Here the authors introduce a plasmid system that allow for the continuous, finely-tuned control of plasmid copy number between 1 and 800 copies per cell.
- Miles V. Rouches
- , Yasu Xu
- & Guillaume Lambert
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| Open AccessReprogramming microbial populations using a programmed lysis system to improve chemical production
Microbial ecosystem-based bioproduction requires the regulation of phenotypic structure of microbial populations. Here, the authors report the construction of a programmed lysis system and its ability for reprograming microbial cooperation in poly(lactate-co-3-hydroxybutyrate) and butyrate production by E. coli strains.
- Wenwen Diao
- , Liang Guo
- & Liming Liu
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| Open AccessDesigning efficient genetic code expansion in Bacillus subtilis to gain biological insights
B. subtilis is valuable both as a model for cell biology and as an industrial organism. Here the authors use genetic code expansion to enable functional tools for exploring cell division dynamics.
- Devon A. Stork
- , Georgia R. Squyres
- & Aditya M. Kunjapur
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| Open AccessRational construction of genome-reduced Burkholderiales chassis facilitates efficient heterologous production of natural products from proteobacteria
An efficient chassis for heterologous expression of biosynthetic gene clusters (BGCs) from Gram-negative bacteria is still unavailable. Here, the authors report rational construction of genome-reduced Burkholderials chassis to facilitate production of a class of new compounds by expressing BGC from Chitinimonas koreensis.
- Jiaqi Liu
- , Haibo Zhou
- & Xiaoying Bian
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Article
| Open AccessNon-additive microbial community responses to environmental complexity
How microbial community properties change under increasingly complex combinations of resources remains unclear. Here, the authors studied hundreds of synthetic consortia to identify the factors that govern how growth and taxonomic diversity scale with environmental complexity.
- Alan R. Pacheco
- , Melisa L. Osborne
- & Daniel Segrè
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| Open AccessProduction of itaconic acid from alkali pretreated lignin by dynamic two stage bioconversion
Lignin conversion to higher value products is essential to the economic viability of lignocellulosic biorefineries. Here, the authors demonstrate the bioconversion of alkali pretreated lignin to itaconic acid by dynamic two stage fermentation using a signal-amplified nitrogen-limitation biosensor.
- Joshua R. Elmore
- , Gara N. Dexter
- & Adam M. Guss
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Article
| Open AccessSurvival of the weakest in non-transitive asymmetric interactions among strains of E. coli
The maintenance of ecological diversity depends on the strength and direction of competitive interactions, but these interactions are difficult to study in microbial communities. Here the authors use engineered E. coli strains to show that competitively weak strains can persist when pairwise interactions are asymmetrical.
- Michael J. Liao
- , Arianna Miano
- & Jeff Hasty
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Article
| Open AccessEngineered CRISPRa enables programmable eukaryote-like gene activation in bacteria
CRISPR activation strategies in bacteria are limited due to the reliance on σ70 promoters. Here the authors demonstrate eukaryote-like gene activation with high dynamic ranges using σ54- dependent promoters.
- Yang Liu
- , Xinyi Wan
- & Baojun Wang
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| Open AccessThe genetic basis for the adaptation of E. coli to sugar synthesis from CO2
An E. coli strain able to use CO2 fixation for sugar synthesis was previously generated by experimental evolution of an engineered strain. Here, Herz et al. show that specific mutations in five genes, encoding carbon metabolism enzymes or key regulators, are sufficient to enable robust growth of the strain.
- Elad Herz
- , Niv Antonovsky
- & Ron Milo
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| Open AccessComputational design of small transcription activating RNAs for versatile and dynamic gene regulation
The structural basis of RNA-based gene control offers the possibility of de novo design. Here the authors present a computational design approach for Small Transcription Activating RNAs a bacterial RNA regulator that allows for versatile and dynamic control of genes, pathways and genetic circuits.
- James Chappell
- , Alexandra Westbrook
- & Julius B. Lucks
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Article
| Open AccessMetabolic labelling of the carbohydrate core in bacterial peptidoglycan and its applications
N-acetyl-muramic acid (NAM) is a core component of the bacterial peptidoglycan (PG) cell wall, and is recognised by the innate immune system. Here the authors engineer Gram-negative and Gram-positive bacteria to incorporate a modified NAM into the backbone of PG, which can be labelled with click chemistry for imaging and tracking.
- Hai Liang
- , Kristen E. DeMeester
- & Catherine L. Grimes
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Article
| Open AccessA portable expression resource for engineering cross-species genetic circuits and pathways
Organism-specific genetic parts are often used to express circuits and pathways, limiting their portability. Here the authors engineer a cross-species expression resource, without using host-specific parts, to control protein and pathway expression in non-model bacteria.
- Manish Kushwaha
- & Howard M. Salis
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Article
| Open AccessA highly selective biosynthetic pathway to non-natural C50 carotenoids assembled from moderately selective enzymes
Synthetic engineering of complex pathways is often hindered by pathway branching and generation of non-target compounds. Here, the authors show that by judicious combination of moderately selective enzyme variants, a non-natural C50 carotenoid can be generated in bacteria with minimal production of unwanted compounds.
- Maiko Furubayashi
- , Mayu Ikezumi
- & Daisuke Umeno
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Article
| Open AccessTwo-dimensional isobutyl acetate production pathways to improve carbon yield
Achieving high carbon yields is crucial for biotechnological production of metabolites in engineered microorganisms. Here, Tashiroet al. generate E. colistrains that produce acetyl-CoA and a derived metabolite (isobutyl acetate) in the absence of pyruvate decarboxylation, leading to increased carbon yields.
- Yohei Tashiro
- , Shuchi H. Desai
- & Shota Atsumi
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| Open AccessIntegrating artificial with natural cells to translate chemical messages that direct E. coli behaviour
The control of cellular behaviour largely relies on genetic engineering, but artificial cells could be designed to control cell processes through chemical communication. Here, the authors develop an artificial cell that is able to translate a chemical message into a signal that can be sensed by E. coliand activate a cellular response.
- Roberta Lentini
- , Silvia Perez Santero
- & Sheref S. Mansy
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Article |
Programming a Pavlovian-like conditioning circuit in Escherichia coli
Synthetic gene circuits can be programmed in living cells to perform diverse cellular functions. Here, the authors program a genetic circuit that performs a Pavlovian-like learning and recall function in E. coli, and demonstrate the dynamic nature of this conditioning process at a population level.
- Haoqian Zhang
- , Min Lin
- & Qi Ouyang