Bacteria sense and respond to the environment, communicate,
and continuously interact with their surroundings, including
host bodies. For more than a century, engineers have been
trying to harness the natural ability of bacteria as live biotherapeutics
for the treatment of diseases. Recent advances in synthetic
biology facilitate the enlargement of the repertoire of
genetic parts, tools, and devices that serve as a framework for
biotherapy. This review describes bacterial species developed
for specific diseases shown in in vitro studies and clinical stages.
Here, we focus on drug delivery by programing bacteria and
discuss the challenges for safety and improvement.
Therapeutic bacteria and viruses to combat cancer: double-edged sword in cancer therapy: new insights for future Aref Yarahmadi, Mitra Zare, Masoomeh Aghayari, Hamed Afkhami, Gholam Ali Jafari Cell Communication and Signaling.2024;[Epub] CrossRef
Physiochemically and Genetically Engineered Bacteria: Instructive Design Principles and Diverse Applications Xia Lin, Rong Jiao, Haowen Cui, Xuebing Yan, Kun Zhang Advanced Science.2024;[Epub] CrossRef
Intestinal Delivery of Probiotics: Materials, Strategies, and Applications Chengcheng Li, Zi‐Xi Wang, Huining Xiao, Fu‐Gen Wu Advanced Materials.2024;[Epub] CrossRef
Research and application of intelligent diagnosis and treatment engineering bacteria Na Zhao, Junwei Chen, Jingtian Shi, Yan Gao, Lijing Li, Liyun Dong Frontiers in Bioengineering and Biotechnology.2024;[Epub] CrossRef
Gastrointestinal worms and bacteria: From association to intervention James Rooney, Cinzia Cantacessi, Javier Sotillo, Alba Cortés Parasite Immunology.2023;[Epub] CrossRef
Bacterial Therapy of Cancer: A Way to the Dustbin of History or to the Medicine of the Future? Larisa N. Ikryannikova, Neonila V. Gorokhovets, Darya A. Belykh, Leonid K. Kurbatov, Andrey A. Zamyatnin International Journal of Molecular Sciences.2023; 24(11): 9726. CrossRef
Derivation and elimination of uremic toxins from kidney-gut axis Ying Xu, Wen-Di Bi, Yu-Xuan Shi, Xin-Rui Liang, Hai-Yan Wang, Xue-Li Lai, Xiao-Lu Bian, Zhi-Yong Guo Frontiers in Physiology.2023;[Epub] CrossRef
Decorated bacteria and the application in drug delivery Feng Wu, Jinyao Liu Advanced Drug Delivery Reviews.2022; 188: 114443. CrossRef
Bakterie Modyfikowane Genetycznie – Perspektywy Zastosowania w Profilaktyce, Diagnostyce I Terapii Barbara Macura, Aneta Kiecka, Marian Szczepanik Postępy Mikrobiologii - Advancements of Microbiology.2022; 61(1): 21. CrossRef
Bacteria and cells as alternative nano-carriers for biomedical applications Rafaela García-Álvarez, María Vallet-Regí Expert Opinion on Drug Delivery.2022; 19(1): 103. CrossRef
Tabrizicola piscis sp. nov., isolated from the intestinal tract of a Korean indigenous freshwater fish, Acheilognathus koreensis
Jeong Eun Han, Woorim Kang, June-Young Lee, Hojun Sung, Dong-Wook Hyun, Hyun Sik Kim, Pil Soo Kim, Euon Jung Tak, Yun-Seok Jeong, Jae-Yun Lee, So-Yeon Lee, Ji-Hyun Yun, Mi-Ja Jung, Na-Ri Shin, Tae Woong Whon, Myung-Suk Kang, Ki-Eun Lee, Byoung-Hee Lee, Ji
International Journal of Systematic and Evolutionary Microbiology
.2020; 70(4): 2305. CrossRef
Novel Strategies for Efficient Production and Delivery of Live Biotherapeutics and Biotechnological Uses of Lactococcus lactis: The Lactic Acid Bacterium Model Laísa M. Tavares, Luís C. L. de Jesus, Tales F. da Silva, Fernanda A. L. Barroso, Viviane L. Batista, Nina D. Coelho-Rocha, Vasco Azevedo, Mariana M. Drumond, Pamela Mancha-Agresti Frontiers in Bioengineering and Biotechnology.2020;[Epub] CrossRef
Lipopolysaccharide (LPS) is one of the major components in
the outer membrane of Gram-negative bacteria. However,
its heterogeneity and variability in different bacteria and differentiation
conditions make it difficult to extract all of the
structural variants. We designed a solution to improve quality
and biological activity of LPS extracted from various bacteria
with different types of LPS, as compared to conventional methods . We introduced a quality index as a simple measure
of LPS purity in terms of a degree of polysaccharide content
detected by absorbance at 204 nm. Further experiments using
gel electrophoresis, endotoxin test, and macrophage activation
test were performed to evaluate the performance and reliability
of a proposed ‘T-sol’ method and the biological effectiveness
and character of the LPS products. We presented
that the T-sol method had differential effects on extraction of
a RAW 264.7 cell-activating LPS, which was effective in the
macrophage activation with similar effects in stimulating
the production of TNF-alpha. In conclusion, the T-sol method
provides a simple way to improve quality and biological activity
of LPS with high yield.
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Identification workflow of endotoxins by pyrolysis–gas chromatography–mass spectrometry based on a database and chemometrics Jackie Jackie, Chun Kiang Chua, Norrapat Shih, Sam Fong Yau Li Journal of Analytical and Applied Pyrolysis.2022; 165: 105547. CrossRef
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The outer membrane glycolipids of bacteria from cold environments: isolation, characterization, and biological activity Angela Casillo, Ermenegilda Parrilli, Maria Luisa Tutino, Maria Michela Corsaro FEMS Microbiology Ecology.2019;[Epub] CrossRef
A Gram-negative, aerobic, short-rod-shaped, motile (with a
terminal flagellum), non-spore-forming bacterium, designated
strain 85T, was isolated from a surface-sterilized bark
of Sonneratia caseolaris collected from Qinzhou in Guangxi,
China and was analyzed using a polyphasic approach to determine
its taxonomic position. Strain 85T grew optimally in
the presence of 1–2% (w/v) NaCl at 30°C and pH 6.0–7.0.
Phylogenetic analysis based on 16S rRNA gene sequence
suggested that strain 85T belonged to the genus Fulvimarina
and shared the highest 16S rRNA gene sequence similarity
with Fulvimarina pelagi HTCC2506T (96.16%). The cell-wall
peptidoglycan contained meso-diaminopimelic acid and ubiquinone
Q-10 was the predominant respiratory lipoquinone.
The polar lipids comprised diphosphatidylglycerol, phosphatidylglycerol,
phosphatidylethanolamine, phosphatidylcholine,
an unidentified amino lipid, three unidentified phospholipids
and six unidentified lipids. The major fatty acid
was C18:1 ω7c. The DNA G+C content of strain 85T was 65.4
mol%, and the average nucleotide identity and estimated
DDH values between strain 85T and the type strain of Fulvimarina
pelagi HTCC2506T were 77.3% and 21.7%, respectively.
Based on the phylogenetic, phenotypic, and chemotaxonomic
analyses, strain 85T should be considered as a novel
species of the genus Fulvimarina with the proposed name
Fulvimarina endophytica sp. nov., and its type strain is 85T
(= KCTC 62717T = CGMCC 1.13665T).
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Fulvimarina uroteuthidis sp. nov., isolated from a marine invertebrate and Uroteuthis (Photololigo) edulis
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A Gram-stain-negative, rod-shaped, obligately aerobic, chemoheterotrophic
bacterium which is motile by means of a
single polar flagellum, designated SAORIC-263T, was isolated
from deep seawater of the Pacific Ocean. Phylogenetic
analyses based on 16S rRNA gene sequences and genomebased
phylogeny revealed that strain SAORIC-263T belonged
to the genus Sulfitobacter and shared 96.1–99.9% 16S rRNA
gene sequence similarities with Sulfitobacter species. Wholegenome
sequencing of strain SAORIC-263T revealed a genome
size of 3.9Mbp and DNA G+C content of 61.3 mol%.
The SAORIC-263T genome shared an average nucleotide identity
and digital DNA-DNA hybridization of 79.1–88.5% and
18.9–35.0%, respectively, with other Sulfitobacter genomes.
The SAORIC-263T genome contained the genes related to
benzoate degradation, which are frequently found in deep-sea
metagenome. The strain contained summed feature 8 (C18:1
ω7c), C18:1 ω7c 11-methyl, and C16:0 as the predominant cellular
fatty acids as well as ubiquinone-10 (Q-10) as the major
respiratory quinone. The major polar lipids of the strain
were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol,
phosphatidylcholine, and aminolipid.
On the basis of taxonomic data obtained in this study, it is
suggested that strain SAORIC-263T represents a novel species
of the genus Sulfitobacter, for which the name Sulfitobacter
profundi sp. nov. is proposed. The type strain is SAORIC-263T
(= KACC 21183T = NBRC 113428T).
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An investigation of Trichoderma biodiversity involving a
large-scale environmental gradient was conducted to understand
the Trichoderma distribution in China. A total of 3,999
isolates were isolated from forestry, grassland, wetland and
agriculture ecosystems, and 50 species were identified based
on morphological characteristics and sequence analysis of
genetic markers. Trichoderma harzianum showed the largest
proportion of isolates and the most extensive distribution.
Hypocrea semiorbis, T. epimyces, T. konilangbra, T. piluliferum,
T. pleurotum, T. pubescens, T. strictipilis, T. hunua, T.
oblongisporum and an unidentified species, Trichoderma sp.
MA 3642, were first reported in China. Most Trichoderma
species were distributed in Jilin and Heilongjiang Provinces
in northeast China and the fewest were distributed in Qinghai
Province. Based on the division of ecological and geographic
factors, forestry ecosystems and low-altitude regions have
the greatest species biodiversity of Trichoderma.
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Strain IMCC1322 was isolated from a surface water sample
from the East Sea of Korea. Based on 16S rRNA analysis,
IMCC1322 was found to belong to the OCS28 sub-clade of
SAR116. The cells appeared as short vibrioids in logarithmicphase
culture, and elongated spirals during incubation with
mitomycin or in aged culture. Growth characteristics of strain
IMCC1322 were further evaluated based on genomic information;
proteorhodopsin (PR), carbon monoxide dehydrogenase,
and dimethylsulfoniopropionate (DMSP)-utilizing
enzymes. IMCC1322 PR was characterized as a functional
retinylidene protein that acts as a light-driven proton pump
in the cytoplasmic membrane. However, the PR-dependent
phototrophic potential of strain IMCC1322 was only observed
under CO-inhibited and nutrient-limited culture conditions.
A DMSP-enhanced growth response was observed in addition
to cultures grown on C1 compounds like methanol, formate,
and methane sulfonate. Strain IMCC1322 cultivation
analysis revealed biogeochemical processes characteristic of
the SAR116 group, a dominant member of the microbial community
in euphotic regions of the ocean. The polyphasic taxonomy
of strain IMCC1322 is given as Candidatus Puniceispirillum
marinum, and was confirmed by chemotaxonomic
tests, in addition to 16S rRNA phylogeny and cultivation
analyses.
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There are presently no studies on the genes for sexual development
of Aspergillus fumigatus in situ using mating culture,
primarily because of challenging experimental conditions
that require a significantly long period of induction and produce
developmentally heterogenous culture, harboring very
few sexual organs. In order to overcome these challenges, we
developed an efficient and convenient procedure called ‘vegetative
mass mating (VeM)’ for study at a molecular level.
The VeM method enabled production of a developmentally
homogenous A. fumigatus culture, harboring many sexual
organs in a plate within a short period of two weeks. Feasibility
of the use of VeM for functional study of genes during
A. fumigatus sexual development was evaluated by analyzing
the transcription pattern of genes involved in pheromone signal
transduction and regulation of sexual development. Here,
we present for the first time, an in situ expression pattern of
sexual genes during the mating process, induced by the VeM method , which will enable and promote the sexual development
study of A. fumigatus at the molecular level.
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The LAMMER Kinase, LkhA, Affects Aspergillus fumigatus Pathogenicity by Modulating Reproduction and Biosynthesis of Cell Wall PAMPs Joo-Yeon Lim, Yeon Ju Kim, Seul Ah Woo, Jae Wan Jeong, Yu-Ri Lee, Cheol-Hee Kim, Hee-Moon Park Frontiers in Cellular and Infection Microbiology.2021;[Epub] CrossRef
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Dihydroxyacid dehydratase (DHAD), encoded by ILV3, catalyses
the third step in the biosynthetic pathway of branchedchain
amino acids (BCAAs), which include isoleucine (Ile),
leucine (Leu), and valine (Val). Enzymes involved in BCAA
biosynthesis exist in bacteria, plants, and fungi but not in
mammals and are therefore attractive targets for antimicrobial
or herbicide development. In this study, three paralogous
ILV3 genes (FgILV3A, FgILV3B, and FgILV3C) were identified
in the genome of Fusarium graminearum, the causal
agent of Fusarium head blight (FHB). Deletion of FgILV3A
alone or combined with FgILV3B or FgILV3C indicated an
important role for FgILV3A in BCAA biosynthesis. FgILV3A
deletion mutants lost the ability to grow on medium lacking
amino acids. Exogenous supplementation of 1 mM Ile and
Val rescued the auxotrophy of ΔFgIlv3A, though 5 mM was
required to recover the growth defects in ΔFgIlv3AB and
ΔFgIlv3AC strains, indicating that FgIlv3b and FgIlv3c exhibit
redundant but accessory roles with FgIlv3a in BCAA
biosynthesis. The auxotrophy of ΔFgIlv3A resulted in pleiotropic
defects in aerial hyphal growth, in conidial formation
and germination, and in aurofusarin accumulation. In addition,
the mutants showed reduced virulence and deoxynivalenol
production. Overall, our study demonstrates that
FgIlv3a is crucial for BCAA biosynthesis in F. graminearum and a candidate fungicide target for FHB management.
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KatA is the major catalase required for hydrogen peroxide
(H2O2) resistance and acute virulence in Pseudomonas aeruginosa
PA14, whose transcription is governed by its dual
promoters (katAp1 and katAp2). Here, we observed that KatA
was not required for acute virulence in another wild type P.
aeruginosa strain, PAO1, but that PAO1 exhibited higher
KatA expression than PA14 did. This was in a good agreement
with the observation that PAO1 was more resistant
than PA14 to H2O2 as well as to the antibiotic peptide, polymyxin
B (PMB), supposed to involve reactive oxygen species
(ROS) for its antibacterial activity. The higher KatA expression
in PAO1 than in PA14 was attributed to both katAp1
and katAp2 transcripts, as assessed by S1 nuclease mapping.
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to both katAp1 and katAp2 in a complementary manner
in PA14 and PAO1, by exploiting the promoter mutants
for each -10 box (p1m, p2m, and p1p2m). These results provide
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display different virulence mechanisms associated with OxyR
and Anr, which need to be further characterized for better
understanding of the critical virulence pathways that may
differ in various P. aeruginosa strains.
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Low-density lipoprotein (LDL) was recently reported to be an
opsonin, enhancing the phagocytosis of group A Streptococcus
(GAS) by human monocytic leukemia U937 cells due to the
binding of LDL to some GAS strains. We postulated that LDL
might also promote the opsonophagocytosis of Pseudomonas
aeruginosa by U937 cells since this bacterium interacts with
LDL. In this study, P. aeruginosa (CMCC10104), U937 cells,
and human LDL were used in phagocytosis assays to test our
hypothesis. Escherichia coli strain BL21, which does not interact
with LDL, was used as a negative control. Colony counting
and fluorescence microscopy were used to determine the
bacterial quantity in the opsonophagocytosis assays. After
incubation of U937 cells and P. aeruginosa with LDL (100
μg/ml) for 15 and 30 min, phagocytosis was observed to be
increased by 22.71% and 32.90%, respectively, compared to
that seen in the LDL-free group. However, LDL did not increase
the phagocytosis of E. coli by U937 cells. In addition,
we identified CD36 as a major opsonin receptor on U937 cells,
since an anti-CD36 monoclonal antibody, but not an anti-
CD4 monoclonal antibody, almost completely abolished the
opsonophagocytosis of P. aeruginosa by U937 cells.
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