Protein species of the parvovirus minute virus of mice strain MVMp: involvement of phosphorylated VP-2 subtypes in viral morphogenesis.

Abstract:

:The pattern of induced protein species of the prototype strain of the parvovirus minute virus of mice was determined in permissive A9 mouse fibroblast cells by high-resolution two-dimensional gel electrophoresis. Identities of the viral proteins in the gels were assigned by probing two-dimensional blots with antisera raised against either purified capsids (recognizing VP-1 and VP-2) or specific coding regions of the nonstructural proteins (NS-1 and NS-2) expressed as beta-galactosidase fusion products in bacteria. All viral proteins showed posttranslational modifications, phosphate being a common substituent. The NS-1 protein migrated as a basic polypeptide in the pI range of 7.4 to 7.8 with multiple stages of modification and as a likely minor but hyperphosphorylated component in the neutral region of the gel. The NS-2 isoforms were resolved at a pI value close to 5.5 as three groups of unevenly phosphorylated polypeptides, each composed of at least two protein species. Both VP-1 and VP-2 structural polypeptides were induced as heterogeneous phosphoproteins. The major VP-2 protein could be resolved in the form of a consistent pattern of three abundant (a to c), two intermediate (d and e), and one meager (f) neutral isoelectric focusing species or subtypes. This posttranslational modification precedes and is uncoupled from viral assembly, and all of the VP-2 subtypes are packaged into empty capsids at the induced stoichiometry. However, intracellular full virions harbored additional phosphorylated subtypes (g to l) and a subtle rearrangement in the whole VP-2 composition, while mature virions purified from lysed cultures lacked these subtypes, coordinately with the emergence of six neutral VP-3 subtypes. Thus, the virion coat undergoes a chemical transition entailed by genome encapsidation, in which phosphates seem to play a major role, triggering the preferential proteolytic cleavage of the more acidic VP-2 subtypes to VP-3. Parvoviruses, with small coding capacity, may regulate some morphogenetic steps, such as assembly, genome encapsidation, and maturation, by posttranslational modifications of their structural proteins.

journal_name

J Virol

journal_title

Journal of virology

authors

Santarén JF,Ramírez JC,Almendral JM

doi

10.1128/JVI.67.9.5126-5138.1993

subject

Has Abstract

pub_date

1993-09-01 00:00:00

pages

5126-38

issue

9

eissn

0022-538X

issn

1098-5514

journal_volume

67

pub_type

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