RT Journal Article SR Electronic(1) A1 Takemoto, Yutaka A1 Hibi, TadaakiYR 2001 T1 Genes Ia, II, III, IV and V of Soybean chlorotic mottle virus are essential but the gene Ib product is non-essential for systemic infection JF Journal of General Virology, VO 82 IS 6 SP 1481 OP 1489 DO https://doi.org/10.1099/0022-1317-82-6-1481 PB Microbiology Society, SN 1465-2099, AB Soybean chlorotic mottle virus (SbCMV) is the type species of the genus ‘Soybean chlorotic mottle-like viruses’, within the family Caulimoviridae. The double-stranded DNA genome of SbCMV (8178 bp) contains eight major open reading frames (ORFs). Viral genes essential and non-essential for the replication and movement of SbCMV were investigated by mutational analysis of an infectious 1·3-mer DNA clone. The results indicated that ORFs Ia, II, III, IV and V were essential for systemic infection. The product of ORF Ib was non-essential, although the putative tRNAMet primer-binding site in ORF Ib was proved to be essential. Immunoselection PCR revealed that an ORF Ia deletion mutant was encapsidated in primarily infected cells, indicating that ORF Ia is required for virus movement but not for replication. ORF IV was confirmed to encode a capsid protein by peptide sequencing of the capsid. Analysis of the viral transcripts showed that the SbCMV DNA genome gives rise to a pregenomic RNA and an ORF VI mRNA, as shown in the case of Cauliflower mosaic virus. , UL https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-82-6-1481