Microbiology Research News and Articles - by David Ojcius

Plasma gelsolin reduces acute inflammation and fungal burden in a 24‑hour mouse model of candidemia. Treatment lowers inflammatory gene expression, decreases renal and pulmonary injury, and improves fungal clearance. In human monocytes, plasma gelsolin boosts fungal uptake, enhances intracellular killing, and modulates reactive radical production without direct candidacidal activity.

Cryo‑electron tomography of native and antibiotic‑perturbed Mycoplasma pneumoniae cells yields 140 in‑cell maps capturing translation initiation, elongation, and recycling. The study visualizes transcription‑translation assemblies, proposes a threading‑based reinitiation mechanism, and provides structural evidence for a supercomplex coordinating transcription, translation, and membrane attachment

Cryo‑electron tomography of Mycoplasma pneumoniae reveals a surface complex combining the conserved Sec‑translocon with a dome‑like assembly formed by three previously uncharacterized Mdps. Integrative proteomics and structural modeling show Mdps resemble PrsA‑like foldases, with Mdp444 retaining catalytic activity. The study provides sub‑nanometer maps of SecA‑mediated translocation coordinated with extracellular protein folding.

Migratory locust eggs emit the microbial volatile 2,4,6‑trimethylpyridine, attracting conspecific females through LmOR34 and LmOR36 to synchronize oviposition. The compound is produced by Enterobacter roggenkampii via lysine degradation, and its loss disrupts attraction. Beyond coordination, 2,4,6‑trimethylpyridine repels soil predators, revealing a dual reproductive and defensive signaling system.

Clostridium immunis protects mice from obesity by secreting a phosphocholine‑modified exopolysaccharide that lowers IL‑22 in the intestine and visceral fat, boosting metabolic activity in adipose tissue. Mutant studies show phosphocholine is essential. Humans with obesity show reduced phosphocholine‑gene abundance, highlighting a translatable strategy to reduce visceral fat.

Analysis of 507 gastric biopsies from 193 children revealed diverse microbial signatures, with HHV6/HHV7 frequently detected and EBV present in a consistent subset. H. pylori showed the strongest link to moderate‑to‑severe inflammation, while EBV also correlated with inflammation, including in H. pylori‑negative patients, highlighting complex pediatric gastric microbial interactions.

The Mononuclear Phagocyte System spans the body and supports homeostasis through highly adaptable interactions beyond immunity. This article introduces a special issue reviewing key phagocyte populations across major organ systems, highlighting their physiologic roles comparable to neuro‑endocrine networks and offering guidance for further study.

First‑line fecal microbiota transplantation yields rapid improvement in most patients with immune checkpoint inhibitor–mediated colitis. In this cohort, 76.9% responded within a median 1.5 days, with increased microbial diversity and reduced immune‑cell activation after treatment. Multi‑omics profiling highlights potential mechanisms underlying FMT response.

Programmed ribosomal frameshifting acts as a regulatory stress signal that activates GCN2 and shuts down host translation. A minimal SARS‑CoV‑2 frameshift element triggers this response independently of ZAKα and is required for viral propagation. DRG1 and IGF2BP3 mediate GCN2 activation, and the mechanism extends to HIV‑1 and West Nile virus.

GORG‑Dark, a dataset of 9,698 single‑cell genomes from deep‑ocean prokaryoplankton, reveals extensive vertical stratification, unexpected particle‑attached Pelagibacterales, and high Patescibacteria and Nanoarchaeota abundance in marginal seas. Coding analyses uncover chemolithoautotrophy, novel proteorhodopsins, and secondary metabolisms across aphotic lineages.

Incretin therapies now improve multiple obesity‑related diseases, with expanding organ‑specific indications. This review explains their mechanisms, evaluates evidence across conditions, and provides a practical framework for using incretin agents beyond endocrinology—covering drug selection, sequencing, monitoring, safety, long‑term management, and access‑limited prescribing.

Predicted bacteriocin genes reveal potential but not function. This review defines four forms of bacteriocin silence—transcriptional, conditional, phenotypic, and ecological—and outlines a function‑first roadmap using condition‑resolved omics, cue‑dissection, structured assays, and defined consortia to link gene catalogs to real ecological impact.

Researchers identify PfSR1‑MT as a melatonin‑responsive GPCR‑like receptor in Plasmodium falciparum . PfSR1‑MT binds melatonin with high affinity, triggers ECD movement and Ca²⁺ signaling, and is selectively activated by ARL34, which inhibits parasite growth and gametocyte development, highlighting a promising antimalarial target.

SCFA‑producing gut bacteria are depleted in Alzheimer’s disease, weakening microbiota‑gut‑brain axis control of neuroinflammation. SCFAs shape microglial and astrocytic states, suppress NLRP3 activation, and influence amyloid, tau, and synaptic integrity. The review evaluates dietary, probiotic, postbiotic, and FMT strategies and outlines biomarker‑guided, personalized therapeutic approaches.

GLP‑1 analogs rely on structural features that enhance stability, receptor affinity, and half‑life. N‑terminal protection, C‑terminal and backbone stabilization, and lipidation drive potency and duration, while structural variation shapes signaling bias. Multi‑receptor agonists and computational design now guide next‑generation incretin therapies.

A cross‑sectional study of SARS‑CoV‑2 patients reveals reduced gut microbial diversity, lower vitamin D, increased Enterococcus faecalis, and loss of key commensals. Functional assays show Bacteroides uniformis can modulate inflammatory responses without altering viral entry. Findings highlight gut microbes’ potential to influence COVID‑19 outcomes and future preparedness.

Rice uses the circadian regulator Nhd1 to time root exudation and coordinate rhizosphere microbial nitrogen cycling. Day‑peaking quercetin 3‑gentiobioside and baseline baimaside activate microbial N‑cycling genes, boosting ammonium availability when plant demand is highest. Engineering microbes to match this rhythm increased grain yield and NUE in field trials.

Corynebacterium glucuronolyticum‑like bacteria are enriched in calcium oxalate stone patients and promote crystal nucleation and aggregation by degrading the anti‑crystallization metabolite hippuric acid and forming biofilms. Their multidrug resistance limits antibiotic efficacy, while hippuric acid supplementation or cranberry diets reduce crystallization in models.

KRAS‑mutant colorectal tumors reshape their microbiome, enriching Bacteroides acidifaciens, which predicts poor prognosis. Using KRAS‑mutant cells and mice, the bacterium drives malignancy via SusF‑mediated stabilization of ARHGEF2, boosting KRAS–RAF–MEK–ERK signaling. Loss of SusF or ARHGEF2 blocks these effects, revealing therapeutic targets for KRAS‑driven colorectal cancer.

Deep learning reveals and redesigns the multifunctional targeting landscape of the T7 phage receptor‑binding protein. Comparing four model architectures, the study engineers phages optimized for 26 tasks, showing that complex specificities can be tuned with few mutations. Multiobjective models uncover principles of phage biology and offer a general strategy for optimizing multifunctional proteins.

Cyclic exposure to the biocide DEAPA selects Salmonella Typhimurium variants with sharply increased tolerance to disinfection, heat, and gentamicin. Adaptive evolution produced multidrug‑tolerant strains carrying mutations across metabolic, signaling, transport, and motility genes, revealing broad cellular rewiring and highlighting risks for food‑processing sanitation.

Phylogeny strongly constrains glycoside hydrolase multidomain architecture across bacterial genera, while environmental factors fine‑tune domain organization in cosmopolitan lineages. Analysis of 158k GH proteins using domain‑adjacency networks reveals conserved lineage‑specific patterns and highlights accessory domains as key drivers of microbial functional adaptation.