NDLI: Analysis of the complete genome of peach chlorotic mottle virus: identification of non-AUG start codons, in vitro coat protein expression, and elucidation of serological cross-reactions

Content Provider	Springer Nature Link
Author	James, D. Varga, A. Croft, H.
Copyright Year	2007
Abstract	The entire genome of peach chlorotic mottle virus (PCMV), originally identified as Prunus persica cv. Agua virus (4N6), was sequenced and analysed. PCMV cross-reacts with antisera to diverse viruses, such as plum pox virus (PPV), genus Potyvirus, family Potyviridae; and apple stem pitting virus (ASPV), genus Foveavirus, family Flexiviridae. The PCMV genome consists of 9005 nucleotides (nts), excluding a poly(A) tail at the 3′ end of the genome. Five open reading frames (ORFs) were identified with four untranslated regions (UTR) including a 5′, a 3′, and two intergenic UTRs. The genome organisation of PCMV is similar to that of ASPV and the two genomes share a nucleotide (nt) sequence identity of 58%. PCMV ORF1 encodes the replication-associated protein complex (Mr 241,503), ORF2 – ORF4 code for the triple gene block proteins (TGBp; Mr 24,802, 12,370, and 7320, respectively), and ORF5 encodes the coat protein (CP) (Mr 42,505). Two non-AUG start codons participate in the initiation of translation: 35AUC and 7676AUA initiate translation of ORF1 and ORF5. In vitro expression with subsequent Western blot analysis confirmed ORF5 as the CP-encoding gene and confirmed that the codon AUA is able to initiate translation of the CP. Expression of a truncated CP fragment (Mr 39, 689) was demonstrated, and both proteins are expressed in vivo, since both were observed in Western blot analysis of PCMV-infected peach and Nicotiana occidentalis. The expressed proteins cross-reacted with an antiserum against ASPV. The amino acid sequences of the CPs of PCMV and ASPV CP share only 37% identity, but there are 11 shared peptides 4–8 aa residues long. These may constitute linear epitopes responsible for ASPV antiserum cross reactions. No significant common linear epitopes were associated with PPV. Extensive phylogenetic analysis indicates that PCMV is closely related to ASPV and is a new and distinct member of the genus Foveavirus.
Starting Page	2207
Ending Page	2215
Page Count	9
File Format	PDF
ISSN	03048608
Journal	Archives of Virology
Volume Number	152
Issue Number	12
e-ISSN	14328798
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-09-22
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Virology Medical Microbiology Infectious Diseases
Content Type	Text
Resource Type	Article
Subject	Virology Medicine

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