GROUP-I INTRONS FOUND IN NUCLEAR SMALL-SUBUNIT RIBOSOMAL-RNA GENES OFTHE BALLISTOCONIDIOGENOUS ANAMORPHIC YEAST BENSINGTONIA-CILIATA AND BENSINGTONIA-YAMATOANA
M. Takashima et al., GROUP-I INTRONS FOUND IN NUCLEAR SMALL-SUBUNIT RIBOSOMAL-RNA GENES OFTHE BALLISTOCONIDIOGENOUS ANAMORPHIC YEAST BENSINGTONIA-CILIATA AND BENSINGTONIA-YAMATOANA, Journal of General and Applied Microbiology, 42(3), 1996, pp. 189-200
Four group I introns were found in the nuclear small subunit ribosomal
RNA genes (SSU rDNA) of the ballistoconidiogenous anamorphic yeast ge
nus Bensingtonia. Two of them were found in B. ciliata, type species o
f the genus, with the length of 335 nt and 341 nt. The remaining two w
ere found in B. yamatoana with lengths of 454 nt and 457 nt, respectiv
ely, The four introns were located at two different sites within the S
SU rDNA. The first insertion site was the same position as group I int
rons found in the SSU rDNA of Dunaliella parva-5', Dunaliella salina,
Protomyces inouyei-5' and Ustilago maydis, The second insertion site w
as shared among group I introns found in the SSU rDNA of Chlorella ell
ipsoidea, Hildenbrandia rubra, Pneumocystis carinii and Protomyces ino
uyei-3'. The putative secondary structures of the introns resembled th
ose of subgroup IC1. Principal coordinate analysis of core regions of
15 group I introns found in SSU rDNA of eukaryotes showed that the seq
uence of B. ciliata-5' intron resembled that of the B. yamatoana-5' in
tron, and the sequence of the B. yamatoana-3' intron resembled that of
the Protomyces inouyei-5' intron, Bensingtonia ciliata-3' intron had
relatively different sequences compared to other group I introns exami
ned. Group I introns in the nuclear SSU rDNA of red and green algae, a
scomycetes and basidiomycetes, examined in this study, were scattered
on the principal coordinate analysis.