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2020 ; 18
(1
): 278
Nephropedia Template TP
gab.com Text
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English Wikipedia
Evolving geographic diversity in SARS-CoV2 and in silico analysis of replicating
enzyme 3CL(pro) targeting repurposed drug candidates
#MMPMID32646487
Chitranshi N
; Gupta VK
; Rajput R
; Godinez A
; Pushpitha K
; Shen T
; Mirzaei M
; You Y
; Basavarajappa D
; Gupta V
; Graham SL
J Transl Med
2020[Jul]; 18
(1
): 278
PMID32646487
show ga
BACKGROUND: Severe acute respiratory syndrome (SARS) has been initiating
pandemics since the beginning of the century. In December 2019, the world was hit
again by a devastating SARS episode that has so far infected almost four million
individuals worldwide, with over 200,000 fatalities having already occurred by
mid-April 2020, and the infection rate continues to grow exponentially. SARS
coronavirus 2 (SARS-CoV-2) is a single stranded RNA pathogen which is
characterised by a high mutation rate. It is vital to explore the mutagenic
capability of the viral genome that enables SARS-CoV-2 to rapidly jump from one
host immunity to another and adapt to the genetic pool of local populations.
METHODS: For this study, we analysed 2301 complete viral sequences reported from
SARS-CoV-2 infected patients. SARS-CoV-2 host genomes were collected from The
Global Initiative on Sharing All Influenza Data (GISAID) database containing 9
genomes from pangolin-CoV origin and 3 genomes from bat-CoV origin, Wuhan
SARS-CoV2 reference genome was collected from GeneBank database. The Multiple
sequence alignment tool, Clustal Omega was used for genomic sequence alignment.
The viral replicating enzyme, 3-chymotrypsin-like cysteine protease (3CL(pro))
that plays a key role in its pathogenicity was used to assess its affinity with
pharmacological inhibitors and repurposed drugs such as anti-viral flavones,
biflavanoids, anti-malarial drugs and vitamin supplements. RESULTS: Our results
demonstrate that bat-CoV shares?>?96% similar identity, while pangolin-CoV shares
85.98% identity with Wuhan SARS-CoV-2 genome. This in-depth analysis has
identified 12 novel recurrent mutations in South American and African viral
genomes out of which 3 were unique in South America, 4 unique in Africa and 5
were present in-patient isolates from both populations. Using state of the art in
silico approaches, this study further investigates the interaction of repurposed
drugs with the SARS-CoV-2 3CL(pro) enzyme, which regulates viral replication
machinery. CONCLUSIONS: Overall, this study provides insights into the evolving
mutations, with implications to understand viral pathogenicity and possible new
strategies for repurposing compounds to combat the nCovid-19 pandemic.