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Brown, Geoffrey; Sutcliffe, Iain C.; Cummings, Stephen

doi:10.1023/a:1023348928376

Cited by 10 publications

(3 citation statements)

References 31 publications

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“…As discussed elsewhere in this volume, the zwitterionic and anionic lipids arise from CDP-diacylglycerol via separate pathways and CL is derived from PG. The proportion of anionic phospholipid increases as the proportion of zwitterionic phospholipid decreases when bacteria are grown in media of increasing salinity [6,7,21,45,47,48,73,74,78,85,86,88]. This behaviour is shared by Gram positive and Gram negative, halophilic and halotolerant bacteria (see Table 1 (representative data) and reviews [73,78,80]).…”

Section: Osmoregulation Of Bacterial Phospholipid Compositionmentioning

confidence: 99%

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Cardiolipin and the osmotic stress responses of bacteria

Romantsov

Guan

Wood

2009

Biochimica et Biophysica Acta (BBA) - Biomembranes

206

166

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Cells control their own hydration by accumulating solutes when they are exposed to high osmolality media and releasing solutes in response to osmotic down-shocks. Osmosensory transporters mediate solute accumulation and mechanosensitive channels mediate solute release. Escherichia coli serves as a paradigm for studies of cellular osmoregulation. Growth in media of high salinity alters the phospholipid headgroup and fatty acid compositions of bacterial cytoplasmic membranes, in many cases increasing the ratio of anionic to zwitterionic lipid. In E. coli, the proportion of cardiolipin (CL) increases as the proportion of phosphatidylethanolamine (PE) decreases when osmotic stress is imposed with an electrolyte or a non-electrolyte. Osmotic induction of the gene encoding CL synthase (cls) contributes to these changes. The proportion of phosphatidylglycerol (PG) increases at the expense of PE in cls– bacteria and, in Bacillus subtilis, the genes encoding CL and PG synthases (clsA and pgsA) are both osmotically regulated. CL is concentrated at the poles of diverse bacterial cells. A FlAsH-tagged variant of osmosensory transporter ProP is also concentrated at E. coli cell poles. Polar concentration of ProP is CL-dependent whereas polar concentration of its paralogue LacY, a H+-lactose symporter, is not. The proportion of anionic lipids (CL and PG) modulates the function of ProP in vivo and in vitro. These effects suggest that the osmotic induction of CL synthesis and co-localization of ProP with CL at the cell poles adjust the osmolality range over which ProP activity is controlled by placing it in a CL-rich membrane environment. In contrast, a GFP-tagged variant of mechanosensitive channel MscL is not concentrated at the cell poles but anionic lipids bind to a specific site on each subunit of MscL and influence its function in vitro. The sub-cellular locations and lipid dependencies of other osmosensory systems are not known. Varying CL content is a key element of osmotic adaptation by bacteria but much remains to be learned about its roles in the localization and function of osmoregulatory proteins.

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Section: Osmoregulation Of Bacterial Phospholipid Compositionmentioning

confidence: 99%

“… a The growth media were: CDM, Chemically Defined Medium [31]; LB, Luria–Bertani medium [47]; MOPS, MOPS-based Minimal Medium [86]; MSM, Minimal Salts Medium [7]; PYE, Peptone Yeast Extract [21]; TSB, Tryptone Soya Broth [6]. …”

Section: Figmentioning

confidence: 99%

Cardiolipin and the osmotic stress responses of bacteria

Romantsov

Guan

Wood

2009

Biochimica et Biophysica Acta (BBA) - Biomembranes

206

166

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“…Oceanmonas sp. là vi khuẩn biển gram âm có khả năng sử dụng phenol làm nguồn carbon [27]. Chủng này chưa có ghi nhận về khả năng gây bệnh.…”

Section: Kết Luậnunclassified

Antibiotics resistance in pathogenic bacteria isolated from water and sediment around the floating fish farms in the Nha Trang bay

Hanh

Hieu

Hiếu

et al. 2021

VJMST

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To assess the impact of antibiotic use in aquaculture in Nha Trang bay, we conducted this study with the aim of assessing antibiotic resistance of opportunistic pathogenic bacteria isolated from water and sediment around shrimp/fish cages in the Nha Trang bay. 109 strains of Vibrio, Salmonella-Shigella and Aeromonas groups were isolated in the surrounding environment of farming areas in Dam Bay and Hon Mieu. Antimicrobial resistance test of these 109 strains showed that in the water environment in Dam Bay, TET (96.6%) and NIT (92.5%) were the two antibiotics with the highest rates of resistant bacteria while no bacteria were resistant to RIF. All 5 types of antibiotics had a statistically insignificant percentage of antibiotic-resistant bacteria in water samples at Hon Mieu, ranging from 33.3% to 68.9%. Also in the water environment, the rate of antibiotic-resistant bacteria in Dam Bay was not influenced by the distance to the cages (42.5–66.6%). Meanwhile, in Hon Mieu, the highest rate of resistant bacteria was observed at the distance of 200 m (100%) away from cages and the lowest rate at the distance of 100 m (20%). In the sediment environment around the cages, both the Dam Bay and Hon Mieu farming areas showed the highest rates of antibiotic-resistant bacteria against TET, NIF and RIF had the lowest rate of resistant bacteria. Among the total of 109 strains tested for antibiotic resistance, 2 strains labeled TCBS_HM200 m and SS_HM200 m were found to be resistant to all 5 tested antibiotics. These two strains were respectively identified as Vibrio harveyi and Oceanimonas sp.

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Microbial responses to solvent and alcohol stress

Taylor

Tuffin

Burton

et al. 2008

Biotechnology Journal

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Increasing fuel prices and doubts over the long-term availability of oil are currently major global concerns. Such concerns have led to national policies and objectives to develop microbially produced alcohols as fuel additives or substitutes. However, in South Africa this solution poses the further dilemma of sourcing a suitable fermentative carbohydrate that will not impact negatively on the availability of staple foods. The solution lies in the use of lignocellulosic materials, currently a waste product of the food and agriculture industries, which could be used in conjunction with a catabolically suitable production strain. In the pursuit of lignocellulosic biofuel production, conventional fermentation strains have been shown to have limited catabolic versatility. However, catabolically versatile engineered strains and novel isolates engineered with ethanologenic pathways have subsequently been shown to exhibit limitations in solvent tolerance, hindering their full potential as economically viable production strains. A considerable volume of research has been reported on the general cellular mechanisms and physiological responses to solvent shock as well as adaptive changes responsible for solvent tolerant phenotypes in mutant progeny. Here we review a number of the more common cell responses to solvents with particular focus on alcohol tolerance.

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Untitled

Cited by 10 publications

References 31 publications

Cardiolipin and the osmotic stress responses of bacteria

Cardiolipin and the osmotic stress responses of bacteria

Antibiotics resistance in pathogenic bacteria isolated from water and sediment around the floating fish farms in the Nha Trang bay

Microbial responses to solvent and alcohol stress

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