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- W1517148956 abstract "Because the rotavirus spike protein VP4 contains conserved Cys residues at positions 216, 318, 380, and 774 and, for many animal rotaviruses, also at position 203, we sought to determine whether disulfide bonds were structural elements of VP4. Electrophoretic analysis of untreated and trypsin-treated rhesus rotavirus (RRV) and simain rotavirus SA11 in the presence and absence of the reducing agent dithioerythritol revealed that VP4 and its cleavage fragments VP5* and VP8* possessed intrachain disulfide bonds. Given that the VP8* fragments of RRV and SA11 contain only two Cys residues, those at positions 203 and 216, these data indicated that these two residues were covalently linked. Electrophoretic examination of truncated species of VP4 and VP4 containing Cys-->Ser mutations synthesized in reticulocyte lysates provided additional evidence that Cys-203 and Cys-216 in VP8* of RRV were linked by a disulfide bridge. VP5* expressed in vitro was able to form a disulfide bond analogous to that in the VP5* fragment of trypsin-treated RRV. Analysis of a Cys-774-->Ser mutant of VP5* showed that, while it was able to form a disulfide bond, a Cys-318-->Ser mutant of VP5* was not. These results indicated that the VP4 component of all rotaviruses, except B223, contains a disulfide bond that links Cys-318 and Cys-380 in the VP5* region of the protein. This bond is located between the trypsin cleavage site and the putative fusion domain of VP4. Because human rotaviruses lack Cys-203 and, hence, unlike many animal rotaviruses cannot possess a disulfide bond in VP8*, it is apparent that VP4 is structurally variable in nature, with human rotaviruses generally containing one disulfide linkage and animal rotaviruses generally containing two such linkages. Considered with the results of anti-VP4 antibody mapping studies, the data suggest that the disulfide bond in VP5* exists within the 2G4 epitope and may be located at the distal end of the VP4 spike on rotavirus particles." @default.
- W1517148956 created "2016-06-24" @default.
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- W1517148956 date "1993-08-01" @default.
- W1517148956 modified "2023-09-27" @default.
- W1517148956 title "Location of intrachain disulfide bonds in the VP5* and VP8* trypsin cleavage fragments of the rhesus rotavirus spike protein VP4" @default.
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- W1517148956 doi "https://doi.org/10.1128/jvi.67.8.4848-4855.1993" @default.
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