Structural organization of the termini of the L and S components of the genome of pseudorabies virus.

Abstract:

:The sequences of several hundred nucleotides around the junctions between the L and S components in concatemeric DNA and in mature virion DNA were ascertained. The two ends of the mature genome (which are joined in concatemeric DNA) show no sequence homology. Several directly repeated elements are present near both ends of the genome. Furthermore, the last 82 nucleotides at the left end of the L component (and of the genome) are repeated in inverted form (inverted repeat within the L component [IRL]) approximately 350 to 600 nucleotides downstream (depending on the virus isolate) bracketing the UL2 component. A comparison between the sequences at the right and left ends of the L component of the genome showed patchy homology, probably representing a vestigial inverted repeat bracketing the L component (IRL). Furthermore, less than 5% of the genomes have an L component that is in the orientation opposite to that of most of the viral genomes, indicating that the vestigial IRL that brackets the UL sequence may be sufficient to mediate inversion of the L component in some of the genomes. On the other hand, the UL2 component, which is bracketed by a perfect IRL, does not invert to a greater extent than does the L component (if it inverts at all). Analysis of the nucleotide sequence at the concatemeric junction of three different pseudorabies virus isolates showed almost complete sequence conservation. The sequence and organization of the repeated elements in the different isolates were almost identical, despite their different histories and origins. The high degree of conservation of these repeated elements implies that they may fulfill an essential function in the life cycle of the virus.

journal_name

J Virol

journal_title

Journal of virology

authors

DeMarchi JM,Lu ZQ,Rall G,Kupershmidt S,Ben-Porat T

doi

10.1128/JVI.64.10.4968-4977.1990

subject

Has Abstract

pub_date

1990-10-01 00:00:00

pages

4968-77

issue

10

eissn

0022-538X

issn

1098-5514

journal_volume

64

pub_type

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