Structurally distinct manganese-sensing riboswitch aptamers regulate diverse expression platform architectures DOI Open Access

Christine Stephen,

Danea Palmer,

Christian T. Bautista

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 15, 2024

Manganese (Mn)-sensing riboswitches protect bacteria from Mn toxicity by upregulating expression of exporters. The aptamers share key features but diverge in other important elements, including within the metal-binding core. Although X-ray crystal structures isolated exist, these structural snapshots lack crucial details about how aptamer communicates presence or absence ligand to platform. In this work, we investigated Mn-sensing translational E. coli (mntP and alx), which differ secondary structure, nucleotide sequence, pH-dependence response. We performed co-transcriptional RNA chemical probing, allowing us visualize folding intermediates that form resolve en route final folded riboswitch. For first time, report sampling metal ions begins before synthesis are complete. At a single-nucleotide resolution, pinpoint transcription window where riboswitching occurs response binding uncover differences alx mntP fold. Finally, describe riboswitch-specific effects pH, providing insights into two members same riboswitch family differentially sense distinct environmental cues: concentration pH.

Language: Английский

The pH dependent surface charging and points of zero charge. X. Update DOI Creative Commons
Marek Kosmulski

Advances in Colloid and Interface Science, Journal Year: 2023, Volume and Issue: 319, P. 102973 - 102973

Published: Aug. 8, 2023

Surfaces are often characterized by their points of zero charge (PZC) and isoelectric (IEP). Different authors use these terms for different quantities, which may be equal to the actual PZC under certain conditions. Several popular methods lead results inappropriately termed PZC. This present review is limited zero-points obtained in presence inert electrolytes (halides, nitrates, perchlorates 1st group metals). IEP reported all kinds materials. metal oxides as common intersection potentiometric curves 3 or more ionic strengths (or means equivalent methods) also reported, while apparent mass titration, pH-drift method, etc. deliberately neglected. The published recent publications older overlooked previous compilations same author reported. PZC/IEP accompanied information on temperature nature concentration supporting electrolyte (if available). references reviews allow compare newest with similar materials from literature.

Language: Английский

Citations

46
Atomic Insights into the Heterogeneous Crystallization of Manganese (Oxyhydr)oxides on Typical Iron (Oxyhydr)oxides: from Adsorption to Oxidation to Crystallization DOI

Shouhao Tong,

Hongyan Wei,

Junming Zhou

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 20, 2025

Heterogeneous crystallization of manganese (oxyhydr)oxides (MnOx) on iron (FeOx) is crucial for the biogeochemical cycling Mn, yet atomic-level insights into this process are important but relatively limited. Herein, we revealed distinct adsorption, oxidation, and mechanisms Mn hematite (Hem), ferrihydrite (Fhy), goethite (Gth). Gth exhibited highest ability in Mn(II) removal followed by Hem Fhy. Manganite hausmannite were main MnOx products with proportions, morphologies cross systems. growth involve surface-induced nucleation, particle attachment (CPA), self-catalyzed growth. On Fhy, was dominant; Gth, nucleation prevalent, supplemented CPA; combined all three mechanisms. These led to nanoparticles primarily nanowires manganite those displaying lower aspect ratios. Differences structure morphology attributed Mn(II)-FeOx complexation, FeOx electronic band structure, crystal mismatch between FeOx, which respectively influenced direct indirect electron transfer heterogeneous efficiency. This work advances our understanding at nanoscale, explaining diverse different environments.

Language: Английский

Citations

1
In-depth study of the removal of Mn(II) by Fe(VI) treatment and the profound influence of NOM on floc formation and properties DOI
Bingqian Yang, Sajid Rashid,

Nigel Graham

et al.

Water Research, Journal Year: 2023, Volume and Issue: 247, P. 120840 - 120840

Published: Nov. 6, 2023

Language: Английский

Citations

12
Ligand-Limited Oxidation of Ciprofloxacin by Mn(Iii) DOI
Tra My Bui Thi, Tao Chen,

Yves Leroux

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
Ligand-limited oxidation of ciprofloxacin by Mn(III) DOI Creative Commons
Tra My Bui Thi, Tao Chen,

Tao Luo

et al.

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: unknown, P. 138373 - 138373

Published: April 1, 2025

Language: Английский

Citations

0
A model explaining the anomalous enrichment of Pt in phosphatized crusts: The influence of phosphates and organic acids DOI
Zhengkun Li, Xiaoming Sun, Dengfeng Li

et al.

Chemical Geology, Journal Year: 2025, Volume and Issue: unknown, P. 122673 - 122673

Published: Feb. 1, 2025

Language: Английский

Citations

0
Immobilization and release behaviors of uranium mediated by the redox processes between manganese oxides and dissolved organic matter: Effects of pH and goethite DOI

Xixian Huang,

Dou Ye,

Bing Yang

et al.

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 490, P. 137860 - 137860

Published: March 5, 2025

Language: Английский

Citations

0
Enhanced oxidation of Cr(III) with the mineral transformation of CrxFe1-x(OH)3 in the presence of Mn(II): overlooked process during the reoccurrence of Cr(VI) in Reduced Chromite Ore Processing Residue DOI
Shuangquan Xie,

Kunpeng Yang,

Shuai Zhang

et al.

Environmental Pollution, Journal Year: 2025, Volume and Issue: 375, P. 126327 - 126327

Published: April 28, 2025

Language: Английский

Citations

0
Coupled effects of iron (hydr)oxides and clay minerals on the heterogeneous oxidation of aqueous Mn(II) and crystallization of manganese (hydr)oxides DOI
Yixuan Yang, Qingze Chen, Jing Liu

et al.

Geochimica et Cosmochimica Acta, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 1, 2024

Language: Английский

Citations

2
Manganese cycling and transport in boreal estuaries impacted by acidic Mn-rich drainage DOI Creative Commons
Changxun Yu,

Stephanie Turner,

Simo Huotari

et al.

Geochimica et Cosmochimica Acta, Journal Year: 2023, Volume and Issue: 365, P. 136 - 157

Published: Dec. 7, 2023

As critical transition zones between the land and sea, estuaries are not only hotspots of hydrogeochemical microbial processes/reactions, but also play a vital role in processing transferring terrestrial fluxes metals nutrients to sea. This study focused on three Gulf Bothnia. All them experience frequent inputs acidic Mn/metal-rich creek waters due flushing acid sulfate soils that widespread creekś catchments. Analyzing existing long-term water chemistry data revealed strong seasonal variation Mn loads, with highest values spring (after snow melt) autumn heavy rains). We sampled surface waters, suspended particulate matter (SPM), sediments from estuarine mixing determined loads solid-phase speciation as well composition metabolic potentials communities. The results showed removal, cycling, lateral transport were governed by similar phases processes estuaries. Manganese X-ray absorption spectroscopy SPM suggested removal was regulated silicates (e.g., biotite), organically complexed Mn(II), MnOx (dominated groutite phyllomanganates). While fractional amounts silicate-bound Mn(II) overall low constant throughout estuaries, strongly correlated loadings thus main vector for central outer parts along Mn(II). Down estuary, both average oxidation state increased (i) total samples (ii) relative abundances several potential Mn-oxidizing bacteria (Flavobacterium, Caulobacter, Mycobacterium, Pedobacter) waters. These features collectively Mn, probably mediated microorganisms, became more extensive complete towards At two sites one abundant phyllomanganates occurred sediments, converted surface-sorbed at deeper layers (>3-4 cm). occurrence may have suppressed reduction pushing down methane zone is typically shallow sediments. outermost site deposited reduced immediately water-sediment interface most likely carbonate. mobile species produced aqueous ligand Mn(III)) could partly diffuse into overlying and, together carried transfer large reactive open coastal areas subsequently contribute shuttling inter-linked biogeochemical over seafloor. Given other sulfidic geological materials many plains worldwide, identified attenuation mechanisms relevant globally.

Language: Английский

Citations

4