MAMMALIAN REOVIRUSES CONTAIN A MYRISTOYLATED STRUCTURAL PROTEIN

被引:103
作者
NIBERT, ML
SCHIFF, LA
FIELDS, BN
机构
[1] HARVARD UNIV, SCH MED, DEPT MICROBIOL & MOLEC GENET, BOSTON, MA 02115 USA
[2] BRIGHAM & WOMENS HOSP, DEPT PATHOL, BOSTON, MA 02115 USA
[3] BRIGHAM & WOMENS HOSP, DEPT MED, BOSTON, MA 02115 USA
[4] SHIPLEY INST MED, BOSTON, MA 02115 USA
关键词
D O I
10.1128/JVI.65.4.1960-1967.1991
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The structural protein mu-1 of mammalian reoviruses was noted to have a potential N-myristoylation sequence at the amino terminus of its deduced amino acid sequence. Virions labeled with [H-3]myristic acid were used to demonstrate that mu-1 is modified by an amide-linked myristoyl group. A myristoylated peptide having a relative molecular weight (M(r)) of approximately 4,000 was also shown to be a structural component of virions and was concluded to represent the 4.2-kDa amino-terminal fragment of mu-1 which is generated by the same proteolytic cleavage that yields the carboxy-terminal fragment and major outer capsid protein mu-1C. The myristoylated 4,000-M(r) peptide was found to be present in reovirus intermediate subviral particles but to be absent from cores, indicating that it is a component of the outer capsid. A distinct large myristoylated fragment of the intact mu-1 protein was also identified in intermediate subviral particles, but no myristoylated mu-region proteins were identified in cores, consistent with the location of mu-1 in the outer capsid. Similarities between amino-terminal regions of the reovirus mu-1 protein and the poliovirus capsid polyprotein were noted. By analogy with other viruses that contain N-myristoylated structural proteins (particularly picornaviruses), we suggest that the myristoyl group attached to mu-1 and its amino-terminal fragments has an essential role in the assembly and structure of the reovirus outer capsid and in the process of reovirus entry into cells.
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页码:1960 / 1967
页数:8
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