title: Kluyveromyces nonfermentans sp. nov., a new yeast species isolated from the deep sea.
abstract: Eleven strains of a new species of the genus Kluyveromyces, characterized as having evanescent asci and Q-6 as the major ubiquinone, were isolated from sediments, a clam and a crab collected at depths of 1000-2000 m in Suruga Bay and Sagami Bay, Japan. A phylogenetic tree based on small-subunit (18S) rRNA gene sequences placed these isolates into a cluster of Kluyveromyces. DNA complementarity and phylogenetic trees of internal transcribed spacer (ITS) regions and 5.8S rRNA genes showed that the isolates are closely related to Kluyveromyces aestuarii, but that these two species are genetically distinct. The isolates are described as Kluyveromyces nonfermentans sp. nov. Because this species lacks the fermentative ability considered to be an important criterion for the genus Kluyveromyces, the definition of the genus has been emended. The type strain of K. nonfermentans is strain SY-33T (= JCM 10232T).
authors.affiliation: Deep-sea Microorganism Research Group, Japan Marine Science and Technology Center, (JAMSTEC), Yokosuka, Japan. nagahama@jamstec.go.jp
authors.forename: T
authors.initials: T
authors.lastname: Nagahama
authors.forename: M
authors.initials: M
authors.lastname: Hamamoto
authors.forename: T
authors.initials: T
authors.lastname: Nakase
authors.forename: K
authors.initials: K
authors.lastname: Horikoshi
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000382:microbiology*; D003386:Brachyura / Q000382:microbiology*; D004271:DNA, Fungal / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D020459:Genes, rRNA; D019015:Geologic Sediments / Q000382:microbiology*; D007716:Kluyveromyces / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology; D008969:Molecular Sequence Data; D010802:Phylogeny; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D012340:RNA, Ribosomal, 5.8S / Q000235:genetics; D012623:Seawater; D017422:Sequence Analysis, DNA
chemical_list: D004271:DNA, Fungal; D004275:DNA, Ribosomal; D012337:RNA, Ribosomal, 18S; D012340:RNA, Ribosomal, 5.8S