Thawai, Chitti

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Thawai, Chitti
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chitti.th@kmitl.ac.th

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    Item type:Publication,
    Planotetraspora kaengkrachanensis sp. nov. and Planotetraspora phitsanulokensis sp. nov., isolated from soil
    (2010-09-01)
    Suriyachadkun, Chanwit
    ;
    Chunhametha, Suwanee
    ;
    Thawai, Chitti
    ;
    Tamura, Tomohiko
    ;
    Potacharoen, Wanchern
    Two novel bacterial strains were isolated from tropical rain forest soil from Thailand. Strains A-T 0875<sup>T</sup> and A-T 1383<sup>T</sup> stained Gram-positive and were filamentous bacteria that developed cylindrical sporangia containing four oval- to rod-shaped spores at the ends of short sporangiophores on branched aerial mycelium. The cell-wall peptidoglycan contained meso-diaminopimelic acid, glutamic acid and alanine as cell-wall amino acids; whole-cell hydrolysates contained rhamnose, madurose, glucose, galactose and 3-O-methylmannose as whole-cell sugars. The predominant menaquinone was MK-9(H<inf>4</inf>). Mycolic acids were not detected. The diagnostic phospholipid was phosphatidylethanolamine. The predominant cellular fatty acids were iso-C<inf>16:0</inf> and 10-methyl-C<inf>17:0</inf>. For both strains, the G+C content of the genomic DNA was 71 mol%. Phenotypic and chemotaxonomic analyses showed that the characteristics of the two isolates were typical of members of the genus Planotetraspora. Furthermore, 16S rRNA gene sequence analysis also indicated that the strains belonged to the genus Planotetraspora but as representatives of two novel species. Following an evaluation of our phenotypic, chemotaxonomic and genotypic studies, two novel species are proposed, Planotetraspora kaengkrachanensis sp. nov. (type strain A-T 0875 <sup>T</sup> = BCC 24832<sup>T</sup> = NBRC 104272<sup>T</sup>) and Planotetraspora phitsanulokensis sp. nov. (type strain A-T 1383<sup>T</sup> = BCC 26045<sup>T</sup> = NBRC 104273<sup>T</sup>). © 2010 IUMS.
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    Actinaurispora siamensis gen. nov., sp. nov., a new member of the family Micromonosporaceae
    (2010-07-01)
    Thawai, Chitti
    ;
    Tanasupawat, Somboon
    ;
    Suwanborirux, Khanit
    ;
    Kudo, Takuji
    Two actinomycete strains, CM2-8<sup>T</sup> and CM2-12, were isolated from temperate peat swamp forest soil in Chiang Mai Province, Thailand. Their taxonomic positions were determined using a polyphasic approach. Chemotaxonomic characteristics of these strains coincided with those of the family Micromonosporaceae, i.e. cell wall chemotype II, N-glycolyl type of muramic acid, and type II phospholipids. Phylogenetic analysis based on 16S rRNA gene sequence data also indicated that these strains fell within the family Micromonosporaceae and formed a distinct taxon in the Micromonosporaceae phylogenetic tree. On the basis of phylogenetic analysis, characteristic patterns of 16S rRNA gene signature nucleotides and chemotaxonomic data, it is proposed that the novel isolates belong to a new genus, Actinaurispora gen. nov. The type species of the genus is proposed as Actinaurispora siamensis sp. nov., with strain CM2-8<sup>T</sup> (=JCM 15677<sup>T</sup>=BCC 34762<sup>T</sup>) as the type strain. © 2010 IUMS.
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    Biological insights into the piericidin family of microbial metabolites
    (2022-02-01)
    Azad, Sepideh M.
    ;
    Jin, Yu
    ;
    Ser, Hooi Leng
    ;
    Goh, Bey Hing
    ;
    Lee, Learn Han
    Extensively produced by members of the genus Streptomyces, piericidins are a large family of microbial metabolites, which consist of main skeleton of 4-pyridinol with methylated polyketide side chain. Nonetheless, these metabolites show differences in their bioactive potentials against micro-organisms, insects and tumour cells. Due to its close structural similarity with coenzyme Q, piericidins also possess an inhibitory activity against NADH dehydrogenase as well as Photosystem II. This review studied the latest research progress of piericidins, covering the chemical structure and physical properties of newly identified members, bioactivities, biosynthetic pathway with gene clusters and future prospect. With the increasing incidence of drug-resistant human pathogen strains and cancers, this review aimed to provide clues for the development of either new potential antibiotics or anti-tumour agents.