title: RNA Polymerase II Second Largest Subunit Molecular Identification of Boletus griseipurpureus Corner From Thailand and Antibacterial Activity of Basidiocarp Extracts.
abstract: BACKGROUND
  Boletus griseipurpureus Corner, an edible mushroom, is a putative ectomycorrhizal fungus. Currently, the taxonomic boundary of this mushroom is unclear and its bitter taste makes it interesting for evaluating its antibacterial properties.
  
  
  OBJECTIVE
  The purpose of this study was to identify the genetic variation of this mushroom and also to evaluate any antibacterial activities.
  
  
  METHODS
  Basidiocarps were collected from 2 north-eastern provinces, Roi Et and Ubon Ratchathani, and from 2 southern provinces, Songkhla and Surat Thani, in Thailand. Genomic DNA was extracted and molecular structure was examined using the RNA polymerase II (RPB2) analysis. Antibacterial activities of basidiocarp extracts were conducted with Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 29523 and methicillin-resistant Staphylococcus aureus (MRSA) 189 using the agar-well diffusion method.
  
  
  RESULTS
  All the samples collected for this study constituted a monophyletic clade, which was closely related with the Boletus group of polypore fungi. For the antibacterial study, it was found that the crude methanol extract of basidiomes inhibited the growth of all bacteria in vitro more than the crude ethyl acetate extract.
  
  
  CONCLUSIONS
  Basidomes collected from four locations in Thailand had low genetic variation and their extracts inhibited the growth of all tested bacteria. The health benefits of this edible species should be evaluated further.
authors.affiliation: Center of Excellence on Agricultural Biotechnology, Science and Technology, Bangkok, Thailand ; Rajamangala University of Technology, Srivijaya Trang Campus, Thammarat, Thailand ; School of Science, Walailak University, Nakhon Si Thammarat, Thailand.
authors.forename: Amornrat
authors.initials: A
authors.lastname: Aung-Aud-Chariya
authors.affiliation: School of Science, Walailak University, Nakhon Si Thammarat, Thailand.
authors.forename: Phuwadol
authors.initials: P
authors.lastname: Bangrak
authors.affiliation: Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand.
authors.forename: Saisamorn
authors.initials: S
authors.lastname: Lumyong
authors.affiliation: School of Science, Walailak University, Nakhon Si Thammarat, Thailand.
authors.forename: Worrapong
authors.initials: W
authors.lastname: Phupong
authors.affiliation: National Institutes of Molecular Biology and Biotechnology, University of the Philippines Los Banos, Laguna, Phillippines.
authors.forename: Nelly Siababa
authors.initials: NS
authors.lastname: Aggangan
authors.affiliation: School of Science, Walailak University, Nakhon Si Thammarat, Thailand.
authors.forename: Niyom
authors.initials: N
authors.lastname: Kamlangdee
keywords: Antibacterial Agents; Antibody Diversity; Boletus
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