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The AS-SCoV2 located in the acidic-domain of papain-like protein of SARS-CoV-2 and bat-SL-CoV-RatG13 guided us to suggest that the novel 2019 coronavirus probably emerged by genetic drift from bat-SL-CoV-RaTG13. The implication of this amino acid signature in papain-like protein structure arrangement and function is something worth to be explored. © 2020 Wiley Periodicals, Inc.BACKGROUND Maltotetraohydrolase, widely used in food and medical fields, possesses the ability to hydrolyze starch to produce maltooligosaccharides w