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2020 ; 286
(ä): 198058
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Role of the GTNGTKR motif in the N-terminal receptor-binding domain of the
SARS-CoV-2 spike protein
#MMPMID32531235
Behloul N
; Baha S
; Shi R
; Meng J
Virus Res
2020[Sep]; 286
(ä): 198058
PMID32531235
show ga
The 2019 novel coronavirus disease (COVID-19) that emerged in China has been
declared as public health emergency of international concern by the World Health
Organization and the causative pathogen was named severe acute respiratory
syndrome coronavirus 2 (SARS-CoV-2). In this report, we analyzed the structural
characteristics of the N-terminal domain of the S1 subunit (S1-NTD) of the
SARS-CoV-2 spike protein in comparison to the SARS-CoV in particular, and to
other viruses presenting similar characteristic in general. Given the severity
and the wide and rapid spread of the SARS-CoV-2 infection, it is very likely that
the virus recognizes other receptors/co-receptors besides the ACE2. The NTD of
the SARS-CoV-2 contains a receptor-binding motif different from that of SARS-CoV,
with some insertions that could confer to the new coronavirus new receptor
binding abilities. In particular, motifs similar to the insertion 72GTNGTKR78
have been found in structural proteins of other viruses; and these motifs were
located in putative regions involved in recognizing protein and sugar receptors,
suggesting therefore that similar binding abilities could be displayed by the
SARS-CoV-2 S1-NTD. Moreover, concerning the origin of these NTD insertions, our
findings point towards an evolutionary acquisition rather than the hypothesis of
an engineered virus.