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Cryptic prophages help bacteria cope with adverse environments.

ABSTRACT: Phages are the most abundant entity in the biosphere and outnumber bacteria by a factor of 10. Phage DNA may also constitute 20% of bacterial genomes; however, its role is ill defined. Here, we explore the impact of cryptic prophages on cell physiology by precisely deleting all nine prophage elements (166 kbp) using Escherichia coli. We find that cryptic prophages contribute significantly to resistance to sub-lethal concentrations of quinolone and ?-lactam antibiotics primarily through proteins that inhibit cell division (for example, KilR of rac and DicB of Qin). Moreover, the prophages are beneficial for withstanding osmotic, oxidative and acid stresses, for increasing growth, and for influencing biofilm formation. Prophage CPS-53 proteins YfdK, YfdO and YfdS enhanced resistance to oxidative stress, prophages e14, CPS-53 and CP4-57 increased resistance to acid, and e14 and rac proteins increased early biofilm formation. Therefore, cryptic prophages provide multiple benefits to the host for surviving adverse environmental conditions.

SUBMITTER: Wang X

PROVIDER: S-EPMC3105296 | biostudies-literature | 2010

REPOSITORIES: biostudies-literature

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Cryptic prophages help bacteria cope with adverse environments.

Wang Xiaoxue X Kim Younghoon Y Ma Qun Q Hong Seok Hoon SH Pokusaeva Karina K Sturino Joseph M JM Wood Thomas K TK

Nature communications 20100101

Phages are the most abundant entity in the biosphere and outnumber bacteria by a factor of 10. Phage DNA may also constitute 20% of bacterial genomes; however, its role is ill defined. Here, we explore the impact of cryptic prophages on cell physiology by precisely deleting all nine prophage elements (166 kbp) using Escherichia coli. We find that cryptic prophages contribute significantly to resistance to sub-lethal concentrations of quinolone and β-lactam antibiotics primarily through proteins ...[more]

PMID: 21266997

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Project description:Live streaming platforms such as Twitch that facilitate participatory online communities have become an integral part of game culture. Users of these platforms are predominantly teenagers and young adults, who increasingly spend time socializing online rather than offline. This shift to online behavior can be a double-edged sword when coping with difficult periods in life such as relationship issues, the death of a loved one, or job loss. On the one hand, platforms such as Twitch offer pleasure, distraction, and relatedness with others to help with coping, and the increased sense of anonymity and control could stimulate self-disclosure. However, the prevalence of trolling and memes may also discourage people from opening up, and relationships that are built online-especially those with microcelebrity streamers-could be perceived as more meaningful than they actually are. To create a deeper understanding of Twitch as a new media platform embedded in game culture, and how users perceive its potential as a coping mechanism, we have conducted a first exploration by means of a survey. The questions focused on general Twitch behavior, the difficult period in life, and the role of Twitch during this period. It was distributed online among people who considered themselves active Twitch users, and who had gone through a difficult period. Eighty-four participants completed the entire survey. The majority of participants indicated that Twitch helped them cope, and that it became a larger part of their lives during the difficult period compared to regular viewing. Recurring themes were the entertainment, distraction, and sense of community Twitch offers. Viewing behavior during difficult periods appears to remain largely the same in terms of the streamers that are watched, although time spent viewing increases, and there is a change toward more time spent actively watching rather than having the stream on in the background. With this work, we aim to create a deeper understanding of Twitch as a platform, and its importance for gamers that are going through difficult periods in life.

Dataset Information

Cryptic prophages help bacteria cope with adverse environments.

Publications

Cryptic prophages help bacteria cope with adverse environments.

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