Bacteria offer resistance to a broad range of antibiotics by activating their export channels of ATP-binding cassette transporters. These transporters perform a central role in vital processes of self-immunity, antibiotic transport and resistance. The majority of ATP-binding cassette transporters are capable of detecting the presence of antibiotics in an external vicinity and are tightly regulated by two-component systems. The presence of an extracellular loop and an adjacent location of both the transporter and two-component system offers serious assistance to induce a quick and specific response against antibiotics. Both systems have demonstrated their ability of sensing such agents, however, the exact mechanism is not yet fully established. This review highlighted the three key functions of antibiotic resistance, transport and self-immunity of ATP-binding cassette transporters and an adjacent two-component regulatory system.

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A novel, human-infecting coronavirus causing COVID-19 was first identified in Wuhan, China in December 2019. Within a short span of time the virus recorded more than 1 million deaths, worldwide. This study addresses the overall evolutionary process from complete genomes of COVID-19. Addressing the complexity of the task, network-based approaches were used in mapping samples to their reported locations. A total of 473 complete human coronavirus genomes from 20 different countries were studied, including samples from 17 states of the United States and samples from the Cruise-Diamond Princess. The phylodynamic network of a global scale was classified into five clusters containing two clusters of the samples from the USA. Cluster B was a shared cluster of samples from China and the USA, while clusters A and C were of a diverse nature. Chinese samples aggregated in clusters A and B which aided in retaining the homogeneous viral genomic pool. In contrast, samples from the USA and Spain were split into distinct clusters which indicated multiple port entries and a possibility of implying a delay in quarantine measures. In the intra-USA samples, we found that sequences reported from Washington and Virginia were scattered indicating evolutionary diversity. This report provides an insight into the transmission pattern of CoV2, which is complicated to evaluate exclusively through the conventional surveillance means.