Duangupama, Thitikorn

Preferred name

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School of Science

thitikorn.du@kmitl.ac.th

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Streptomyces sennicomposti sp. nov., an actinomycete isolated from compost of Senna siamea (Lam.)
(2022-01-01)
Duangupama, Thitikorn
;
Pittayakhajonwut, Pattama
;
Intaraudom, Chakapong
;
Suriyachadkun, Chanwit
;
Sirirote, Pramote
A member of the genus Streptomyces, designated RCPT1-4T, was isolated from compost of Senna siamea (Lam.), collected from an agricultural area in Rayong province, Thailand. The spore morphology and the presence of ll-diaminopimelic acid in the peptidoglycan indicate that RCPT1-4T shows the typical properties of members of the genus Streptomyces. On the basis of the results of 16S rRNA gene sequence analysis, the strain should be classified as representing a member of the genus Streptomy-ces and was most closely related to Streptomyces fumigatiscleroticus NBRC 12999T with the highest 16S rRNA gene sequence similarity of 99.2%, followed by Streptomyces spiralis NBRC 14215T (99.0%). In addition, RCPT1-4T shared the highest average nucleotide identity by blast (ANIb) (86.0%), and digital DNA–DNA hybridization (dDDH) (32.1%) values with S. spiralis NBRC 14215T. Furthermore, several physiological and biochemical differences were observed between RCPT1-4T and the closely related type strains of species with validly published names. These taxonomic data indicated that RCPT1-4T could be considered to represent a novel species of the genus Streptomyces and the name Streptomyces sennicomposti sp. nov. is proposed for this strain. The type strain is RCPT1-4T (=TBRC 11260T=NBRC 114303T).
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Streptomyces acidipaludis sp. nov., an actinobacterium isolated from peat swamp forest soil
(2022-01-01)
Nammali, Achararak
;
Duangupama, Thitikorn
;
Pittayakhajonwut, Pattama
;
Intaraudom, Chakapong
;
Suriyachadkun, Chanwit
An actinobacterium strain PLK6-54T was isolated from Lankwai peat swamp forest soil collected from Yala province, Thailand. Strain PLK6-54T exhibited morphological and chemotaxonomic properties described for the genus Streptomyces. It formed a spiral spore chain directly on aerial mycelium. Growth was observed between 20 and 40 °C and at pH 5–8. The maximum NaCl for growth was 2% (w/v). ll-Diaminopimelic acid, arabinose and ribose were detected in the whole-cell hydrolysate. Diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylinositol and phosphatidylinositolmannoside were detected as the phospholipids. The major menaquinones were MK-10(H<inf>2</inf>) and MK-9(H<inf>6</inf>). The major cellular fatty acids were iso-C<inf>16:0</inf>, anteiso-C<inf>15:0</inf> and iso-C<inf>14:0</inf>. 16S rRNA gene sequence data supported the assignment of strain PLK6-54T to the genus Streptomyces and showed that Streptomyces rubidus NBRC 102073T (99.0%) was the closest relative. Moreover, the average nucleotide identity-blast (85.5%) and digital DNA–DNA hybridization (30.7%) values reported between strain PLK6-54T and its closest neighbour were below the threshold values for delineation of a novel species. Strain PLK6-54T could be distinguished from related validly described Streptomyces species by several phenotypic properties. The combination of genotypic and phenotypic data indicated that strain PLK6-54T is representative of a novel species of the genus Streptomyces. The name Streptomyces acidipaludis sp. nov. is proposed for strain PLK6-54T. The type strain is PLK6-54T (=TBRC 11250T=NBRC 114297T).
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Streptomyces zingiberis sp. nov., an endophytic actinobacterium isolated from the root tissue of Zingiber montanum
(2023-06-01)
Pansomsuay, Rawirat
;
Duangupama, Thitikorn
;
Pittayakhajonwut, Pattama
;
Intaraudom, Chakapong
;
Suriyachadkun, Chanwit
An endophytic actinobacterium, designated strain PLAI 1-29T, was isolated from the root tissue of Zingiber montanum collected from Pathum Thani province, Thailand. Strain PLAI 1-29T was characterized using a polyphasic taxonomic approach. It typically exhibited morphological and chemotaxonomic properties of the genus Streptomyces. Strain PLAI 1-29T produced a spiral spore chain on aerial mycelium and grew at 15–40 °C, pH 6–10 on International Streptomyces Project 2 agar. The maximum NaCl concentration for growth was 9% (w/v). Cells of strain PLAI 1-29T presented ll-diaminopimelic acid, arabinose, galactose and ribose. The detected phospholipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphati-dylinositol and phosphatidylinositol mannoside. The major menaquinones were MK-9(H<inf>6</inf>) and MK-9(H<inf>8</inf>). The major cellular fatty acids were iso-C<inf>16:0</inf>, anteiso-C<inf>15:0</inf> and anteiso-C<inf>17:0</inf> . The genome-based taxonomic details revealed the assignment of strain PLAI 1-29T to the genus Streptomyces and exhibited low threshold values for the delineation of a novel species by average nucleotide identity–blast (84.0%), average amino acid identity (80.0%) and digital DNA–DNA hybridization (27.6%) with its closest type strain, Streptomyces xinghaiensis S187T. Furthermore, several differential physiological and biochemical characteristics were detected between strain PLAI 1-29T and the closest type strain. Based on the combined phenotypic and genomic features, strain PLAI 1-29T (=TBRC 7645T=NBRC 113170T) is considered to represent a new Streptomyces species, for which we propose the name Streptomyces zingiberis sp. nov.
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Streptomyces telluris sp. nov., a promising terrestrial actinobacterium with antioxidative potentials
(2023-06-01)
Thayanuwadtanawong, Onnicha
;
Duangupama, Thitikorn
;
Bunbamrung, Nantiya
;
Pittayakhajonwut, Pattama
;
Intaraudom, Chakapong
An actinomycete strain, AA8T, which produced a long straight chain of spores (verticillati type), was isolated from the rhizosphere soil of Mangifera indica in Bangkok, Thailand. A polyphasic taxonomic study was carried out to establish the taxonomic position of the strain. Strain AA8T formed a tight taxonomic position in the 16S rRNA gene tree with Streptomyces roseifaciens MBT76T. In contrast, the genome-based taxonomic analysis showed that strain AA8T shared low average nucleotide identity-BLAST (94.1%), the digital DNA–DNA hybridization (58.2%), and the average amino acid identity (93.6%) values with S. roseifaciens MBT76T. Moreover, a combination of physiological and biochemical properties indicated that strain AA8T was distinguished from all Streptomyces species with effectively published names. Strain AA8T, therefore, represents a novel species of Streptomyces, and the name Streptomyces telluris is proposed for the strain. The type strain is AA8T (= TBRC 8483T = NBRC 113461T). The chemical investigation led to the isolation of nine known compounds (compounds 1–9). Among these compounds, compound 7 (3,4-dihydroxybenzaldehyde) possesses strong antioxidant activity equal to ascorbic acid, a powerful antioxidative agent.

Duangupama, Thitikorn

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