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The nucleotide sequence of a near left-terminal region from the genome of Molluscum contagiosum virus subtype I (MCVI) was determined. This region was contained within three adjacent BamHI fragments, designated L (2.4 kilobases (kb)), M (1.8 kb), and N (1.6 kb). BamHI cleavage of MCVI DNA produced another 1.6-kb fragment (N'), which had been mapped 30-50 kb from the L,M region. The MCVI restriction fragments were cloned and end-sequenced. The N fragment that maps at the L,M region was identified by the polymerase chain reaction, using primers devised from the sequence of each fragment. The results from this analysis led to establish the relative position of these fragments within the MCVI genome. The analysis of 3.6 kb of DNA sequence revealed the presence of ten open reading frames (ORFs). Comparison of the amino acid sequence of these ORFs to the amino acid sequence of vaccinia virus (VAC) proteins revealed that two complete MCVI ORFs, termed N1L and L1L, showed high degree of homology with VAC F9 and F10 genes, respectively. The F10 gene encodes a 52-kDa serine/threonine protein kinase (protein kinase 2), an essential protein involved in virus morphogenesis. The MCVI homologue (L1L) encoded a putative polypeptide of 443 aa, with a calculated molecular mass of 53 kDa, and 60.5/30.2% sequence identity/similarity to VAC F10. The MCV N1L (213 aa, 24 kDa) showed 42.6/40.6% amino acid sequence identity/similarity to VAC F9, a gene of unknown function encoding a 24-kDa protein with a hydrophobic C-terminal domain, which was conserved in MCVI. The genomic arrangement of MCVI N1L and L1L was equivalent to that of the vaccinia and variola virus homologues. However, the ORFs contained within MCVI fragment M (leftward) showed no homology, neither similarity in genetic organization, to the genes encoded by the corresponding regions of vaccinia and variola viruses.

virus genes

Sequence analysis of aMolluscum contagiosum virus DNA region which includes the gene encoding protein kinase 2 and other genes with unique organization