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Sulphadimidine Bolus is a kind of sulfa antibiotic preparation for animal or human use, mainly used to prevent and treat infectious diseases caused by sensitive bacteria. Its main active ingredient is sulfadimidine, also known as N - (4,6-dimethyl-2-pyrimidinyl) -4-aminobenzenesulfonamide. This substance is usually made in the form of suppositories or pills for easy administration and storage. Suppositories may contain matrix components to aid in drug formation and release, while pills may contain excipients such as fillers and adhesives. Sulfonamide is a broad-spectrum antibacterial agent, and its mechanism of action is similar to that of p-aminobenzoic acid (PABA). In bacteria, PABA is an important raw material for synthesizing folate, which is an essential substance for bacteria to synthesize purine, thymidine, and deoxyribonucleic acid (DNA). Sulfamethoxamine competes with PABA to bind to dihydrofolate synthase, preventing PABA from participating in folate synthesis and reducing the amount of metabolically active tetrahydrofolate, thereby inhibiting bacterial growth and reproduction.
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Sulphadimidine COA
The interaction between Sulphadimidine and key microbial functional groups
Sulphadimidine Bolus, as a broad-spectrum sulfonamide antibiotic, competitively inhibits the activity of bacterial dihydrofolate synthase, blocks the folate metabolism pathway, and thus inhibits bacterial growth and reproduction. Its antibacterial mechanism is structurally similar to that of para aminobenzoic acid (PABA), making it widely used in clinical and veterinary fields. However, with the long-term use of antibiotics, the residual amount of sulphadimidine in the environment significantly increases, which has a profound impact on the structure and function of microbial communities.
Direct inhibitory effect of sulphadimidine on microbial functional groups
Inhibition of Microbial Metabolic Activity
Sulfamethoxazine directly inhibits bacterial DNA, RNA, and protein synthesis by blocking the folate metabolism pathway. Research has shown that in anaerobic ammonia oxidation systems, the denitrification efficiency of small particle size sludge (<0.5 mm) significantly decreases, and its nitrate reductase and nitrite reductase activities decrease, leading to a decrease in ammonia nitrogen removal rate. This inhibitory effect is directly related to microbial metabolic activity. Small particle sludge has high mass transfer efficiency and fast proliferation rate, but low microbial diversity makes it more susceptible to sulphadimidine stress.
Oxidative stress and cell damage
Sulfamethoxazine induces oxidative stress response in microorganisms, upregulating the expression of glutathione peroxidase genes (gpx), superoxide dismutase genes (SOD1/SOD2), and catalase genes (katE/katG). In the activated sludge system, exposure to sulphadimidine leads to an increase in the secretion of extracellular polymeric substances (EPS) by microorganisms, with a significant increase in protein and polysaccharide content, forming a protective barrier to reduce drug toxicity. However, high concentrations of sulphadimidine (>50 mg/L) can damage cell membrane integrity, leading to leakage of intracellular substances and cell death.
Regulation of functional gene expression
Sulfamethoxazine has a dual effect on the expression of microbial functional genes:
Basic metabolic genes: In large-diameter anaerobic ammonium oxidation sludge (1.0-2.0 mm), key enzymes in the tricarboxylic acid cycle, such as citrate synthase and succinate dehydrogenase, are relatively abundant, indicating their resistance to drug stress by maintaining basic metabolic activity.
Resistance genes: sulphadimidine induces the expression of SOS response genes (recA, recX, lexA), promotes horizontal gene transfer (HGT), and drives the accumulation of multidrug resistance genes (such as cpxR, mexB).
Development mechanism of microbial functional groups' resistance to sulphadimidine
Spread and diffusion of resistance genes
Two strains of sulfamethazine resistant bacteria (Pseudomonas asiatica sp. nov.) isolated from an anaerobic ammonia oxidation system indicate that plasmids are the main vectors driving the transfer of multidrug resistance genes. The proportion of antibiotic resistance genes (ARGs) in the chromosomes of both strains of bacteria is less than 10%, while the proportion of ARGs on plasmids ranges from 52.0% to 58.3%. Among them, plasmid pKF7158B is the dominant resistance plasmid, which differs from plasmid pKF715A in sludge, indicating that resistance genes are transmitted between different microorganisms through plasmid conjugation transfer.
Adaptive adjustment of microbial community structure
Different particle sizes of anaerobic ammonium oxidation sludge exhibit differentiated resistance strategies:
Small particle size sludge: relies on dense EPS to form a physical barrier, but ARGs and mobile genetic elements (MGEs) contribute less and have limited resistance ability.
Medium sized sludge (0.5-1.0 mm): accelerates gene horizontal transfer by synthesizing extracellular proteins and increasing the number of flagella, while containing more MGEs to promote the diffusion of resistance genes.
Large particle size sludge: Utilizing functional redundancy and spatial conservation characteristics, it drives the accumulation of multidrug resistance genes such as cpxR and mexB by increasing oxidative stress kinase activity, secretion system activity, and pili formation.
Metabolic pathway reconstruction and functional substitution
Under sulphadimidine stress, microorganisms maintain their function by restructuring metabolic pathways:
Nitrogen metabolism: The relative abundance of denitrifying bacteria (such as Thauera and Zoogloea) in large particle sludge increases, compensating for the inhibition of anaerobic ammonia oxidation activity by enhancing nitrate and nitrite reduction abilities.
Carbon metabolism: The activity of key glycolytic enzymes such as glucose-6-phosphate isomerase and pyruvate kinase increases, promoting the breakdown of organic matter to provide energy.
Thiometabolism: Sulfate reducing bacteria (such as Desulfovibrio) generate hydrogen sulfide by reducing sulfate, neutralizing the oxidative damage of sulphadimidine.
Long term effects of sulphadimidine on environmental microbial functional groups
Changes in Soil Microbial Community Diversity
In vegetable soil treated with manure, residues of sulphadimidine significantly alter the microbial community structure
Functional diversity: The utilization ability of carbon sources other than esters is enhanced in the medium and high dose groups, and the microbial activity is increased. However, long-term residues lead to unstable community functional diversity.
Community composition: The number of Gram negative bacteria and fungi increases, while actinomycetes are inhibited. Sulfamethoxazine indirectly regulates community structure by affecting soil enzyme activity (such as dehydrogenase, urease) and microbial biomass carbon.
Resistance gene library: The abundance of sulfonamide resistance genes (sul1, sul2) in soil is positively correlated with the residual amount of Sulphadimidine Bolus, and plasmid mediated HGT is the main pathway for the diffusion of resistance genes.
Imbalance of microbial functional groups in water bodies
In the activated sludge system, sulphadimidine leads to an imbalance in the proportion of functional microorganisms:
-Nitrifying bacteria: The activity of ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) is inhibited, resulting in a decrease in ammonia nitrogen removal rate.
Denitrifying bacteria: The relative abundance of denitrifying bacteria such as Thauera and Zoogloea increases, but high concentrations of drugs (>100 mg/L) can inhibit their denitrification ability.
Phosphorus accumulating bacteria such as Candidatus-ACtumulibacter exhibit reduced activity, leading to a decrease in biological phosphorus removal efficiency.
Ecological chain transmission and biomagnification effect
Sulfamethoxazine is toxic to higher organisms through food chain transmission:
Fish gut microbiota: After exposure to sulphadimidine, the diversity of gut microbiota in marine medaka decreased, with an increase in the relative abundance of Firmicutes and a decrease in Proteobacteria, leading to metabolic dysfunction.
Endocrine disruption: Sulfamethoxamine interferes with fish sex hormone synthesis, affecting reproductive development, and its effects are closely related to gut microbiota dysbiosis.
Bioaccumulation: In the soil plant animal system, sulphadimidine accumulates step by step along the food chain, with the highest concentration reaching 10 ³ -10 ⁴ times the initial release amount, posing a threat to ecosystem stability.
Microbial functional group mediated degradation mechanism of sulphadimidine
Co metabolic degradation pathways
Some microorganisms can degrade sulphadimidine through co metabolism:
White rot fungus: Phanerochaete chrysosporium secretes manganese peroxidase and lignin peroxidase to oxidize the benzene ring structure of sulphadimidine, generating intermediate sulfamic acid for further ring opening degradation.
Bacterial degradation: Bacteria such as Rhodococcus and Arthrobacter catalyze the conversion of sulphadimidine into hydroxylated products through monooxygenase and dioxygenase, ultimately mineralizing into CO ₂ and H ₂ O.
Enzymatic degradation reaction
The key degradation enzymes include:
Cytochrome P450: catalyzes the N-desulfonylation reaction of sulphadimidine to produce desulfonyl products.
Sulfonamide hydrolase: specifically hydrolyzes sulfonamide bonds, releasing p-aminobenzenesulfonic acid and dimethyl pyrimidine.
Peroxidase: destroys the aromatic ring structure of sulphadimidine through oxidation reaction.
Collaborative degradation of microbial communities
In composting systems, microbial communities accelerate the degradation of sulphadimidine through synergistic effects
Thermophilic bacteria: During the high temperature stage (55-65 ℃), they degrade drugs by secreting heat stable enzymes.
Thermophilic bacteria: continue to degrade intermediate products during the cooling stage (<40 ℃) to achieve complete mineralization.
Fungal bacterial interaction: Fungi reduce pH and promote bacterial degradation enzyme activity by producing organic acids; Bacteria support fungal growth by providing vitamins and amino acids.
Microbial regulation strategies for addressing sulphadimidine pollution
Resistance gene transmission blockade
Plasmid elimination: Treat resistant bacteria with SDS or sodium dodecyl sulfate to disrupt plasmid replication.
CRISPR Cas system: Design gRNAs targeting resistance genes and cut resistance genes through gene editing.
Phage therapy: Screening bacteriophages that specifically lyse resistant bacteria to reduce the host of resistance genes.
Optimization of functional group structure
Functional bacterial inoculation: Add functional bacteria such as nitrifying bacteria, denitrifying bacteria, and polyphosphate accumulating bacteria to restore microbial community function.
Biochar addition: Biochar promotes the growth of functional bacteria by adsorbing sulphadimidine and providing a carbon source.
Electron donor regulation: Adding methanol or sodium acetate as electron donors enhances the activity of denitrifying bacteria.
Ecological Engineering Restoration
Artificial wetland: Construct a surface flow and subsurface flow composite wetland, utilizing plant root secretion enzymes and microorganisms to degrade drugs.
Microbial fuel cell: promotes the degradation of sulphadimidine through electrochemical action, while recovering electrical energy.
Algae bacteria symbiotic system: utilizing algae photosynthesis to provide oxygen and enhance bacterial degradation ability.
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