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Nucleic Acids Research, 1987, Vol. 15, No. 17 7045-7052
© 1987

Articles

Nucleotide sequence and secondary structure of apple scar skin viroid

Junji Hashimoto* and Hiroki Koganezawa1

National Institute of Agrobiological Resources Tsukuba Science City, Yatabe, Ibaraki 305 1Morioka Branch, Fruit Tree Research Station Shimokuriyagawa, Morioka 020-01, Japan

*To whom correspondence should be addressed. Present address: National Institute of Animal Health, Tsukuba Science City, Yatabe, Ibaraki 305, Japan

Received June 23, 1987. Revised August 5, 1987. Accepted August 5, 1987.

The complete nucleotide sequence of apple scar skin viroid(ASSV) has been established, and a probable secondary structure is proposed. A single-stranded circular ASSV RNA consists of 330 nucleotides and can assume the rodlike conformation with extensive base-pairing characteristic of all the known viroids. ASSV shows low sequence homologies with other viroids and lacks the central conserved region. These indicate that ASSV should be allocated to a separate viroid group. However, homologous sequences with potato spindle tuber viroid(PSTV) in ASSV occur in limited and scattered regions of both viroids. These homologous regions fall within the particular domains in the viroid domain model which has been previously proposed by Keese and Symons(Proc. Natl. Acad. Sci. USA. 82, 4582–4586, 1985).


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