A slender tract of glycine residues is required for translocation of the VP2 protein N-terminal domain through the parvovirus MVM capsid channel to initiate infection

被引:15
|
作者
Castellanos, Milagros [1 ]
Perez, Rebeca [1 ]
Rodriguez-Huete, Alicia [1 ]
Grueso, Esther [1 ]
Almendral, Jose M. [1 ]
Mateu, Mauricio G. [1 ]
机构
[1] Univ Autonoma Madrid, Ctr Biol Mol Severn Ochoa CSIC UAM, E-28049 Madrid, Spain
关键词
conformational dynamics; macromolecular assembly; peptide translocation; structure-function relationship; virus entry and infection; MINUTE VIRUS; CANINE PARVOVIRUS; CELL ENTRY; VP1N-TERMINAL SEQUENCE; NUCLEAR TRANSPORT; HOST-RANGE; MICE; VIRION; GENOME; EXTERNALIZATION;
D O I
10.1042/BJ20130503
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Viruses constitute paradigms to study conformational dynamics in biomacromolecular assemblies. Infection by the parvovirus MVM (minute virus of mice) requires a conformational rearrangement that involves the intracellular externalization through capsid channels of the 2Nt (N-terminal region of VP2). We have investigated the role in this process of conserved glycine residues in an extended glycine-rich tract located immediately after 2Nt. Based on the virus structure, residues with hydrophobic side chains of increasing volume were substituted for glycine residues 31 or 33. Mutations had no effect on capsid assembly or stability, but inhibited virus infectivity. All mutations, except those to alanine residues which had minor effects, impaired 2Nt externalization in nuclear maturing virions and in purified virions, to an extent that correlated with the side chain size. Different biochemical and biophysical analyses were consistent with this result. Importantly, all of the tested glycine residue replacements impaired the capacity of the virion to initiate infection, at ratios correlating with their restrictive effects on 2Nt externalization. Thus small residues within the evolutionarily conserved glycine-rich tract facilitate 2Nt externalization through the capsid channel, as required by this virus to initiate cell entry. The results demonstrate the exquisite dependence on geometric constraints of a biologically relevant translocation event in a biomolecular complex.
引用
收藏
页码:87 / 94
页数:8
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