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Kikukawa, Takashi,Shimono, Kazumi,Tamogami, Jun,Miyauchi, Seiji,Kim, So Young,Kimura-Someya, Tomomi,Shirouzu, Mikako,Jung, Kwang-Hwan,Yokoyama, Shigeyuki,Kamo, Naoki American ChemicalSociety 2011 Biochemistry Vol.50 No.41
<P><I>Acetabularia</I> rhodopsins are the firstmicrobialrhodopsins discovered in a marine plant organism, <I>Acetabulariaacetabulum</I>. Previously, we expressed <I>Acetabularia</I> rhodopsin II (ARII) by a cell-free system from one of two opsingenes in <I>A. acetabulum</I> cDNA and showed that ARIIis a light-driven proton pump [Wada, T., et al. (2011) <I>J.Mol. Biol.</I><I>411</I>, 986–998]. In thisstudy, the photochemistry of ARII was examined using the flash-photolysistechnique, and data were analyzed using a sequential irreversiblemodel. Five photochemically defined intermediates (P<SUB><I>i</I></SUB>) were sufficient to simulate the data. Noticeably, both P<SUB>3</SUB> and P<SUB>4</SUB> contain an equilibrium mixture of M, N,and O. Using a transparent indium tin oxide electrode, the photoinducedproton transfer was measured over a wide pH range. Analysis of thepH-dependent proton transfer allowed estimation of the p<I>K</I><SUB>a</SUB> values of some amino acid residues. The estimated valueswere 2.6, 5.9 (or 6.3), 8.4, 9.3, 10.5, and 11.3. These values wereassigned as the p<I>K</I><SUB>a</SUB> of Asp81 (Asp85<SUP>BR</SUP>) in the dark, Asp92 (Asp96<SUP>BR</SUP>) at N, Glu199 (Glu204<SUP>BR</SUP>) at M, Glu199 in the dark, an undetermined proton-releasingresidue at the release, and the pH to start denaturation, respectively.Following this analysis, the proton transfer of ARII is discussed.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bichaw/2011/bichaw.2011.50.issue-41/bi2009932/production/images/medium/bi-2011-009932_0006.gif'></P>
김창선,유승헌,Akira Nakagiri,Takashi Shirouzu,Kozue Sotome,김선철,Nitaro Maekawa 한국식물병리학회 2012 Plant Pathology Journal Vol.28 No.4
Shiitake (Lentinula edodes) is the most economically important cultivated mushroom, but yields are impacted by its competitor, Trichoderma spp. We previously found two unidentified Trichoderma species growing in bedlogs and sawdust shiitake media in Korea. Here, we identify and re-describe those two species based on molecular sequence data, morphology, and culture characteristics. Well-supported clades based on phylogenetic analyses of internal transcribed spacer, translation elongation factor 1-α, and RNA polymerase subunit II sequences grouped one of the unidentified Trichoderma spp. with Hypocrea pseudogelatinosa and the other with Hypocrea pseudostraminea, and their morphologies matched well with the original descriptions of the two Hypocrea species. This study reports the first phylogenetic analyses of H. pseudogelatinosa and Japanese strains of H. pseudostraminea. Based on the phylogenetic results, we redescribed these two species using modern taxonomic concepts in Hypocrea/Trichoderma.
Kim, Chang Sun,Yu, Seung Hun,Nakagiri, Akira,Shirouzu, Takashi,Sotome, Kozue,Kim, Seon Cheol,Maekawa, Nitaro The Korean Society of Plant Pathology 2012 Plant Pathology Journal Vol.28 No.4
Shiitake (Lentinula edodes) is the most economically important cultivated mushroom, but yields are impacted by its competitor, Trichoderma spp. We previously found two unidentified Trichoderma species growing in bedlogs and sawdust shiitake media in Korea. Here, we identify and re-describe those two species based on molecular sequence data, morphology, and culture characteristics. Well-supported clades based on phylogenetic analyses of internal transcribed spacer, translation elongation factor 1-${\alpha}$, and RNA polymerase subunit II sequences grouped one of the unidentified Trichoderma spp. with Hypocrea pseudogelatinosa and the other with Hypocrea pseudostraminea, and their morphologies matched well with the original descriptions of the two Hypocrea species. This study reports the first phylogenetic analyses of H. pseudogelatinosa and Japanese strains of H. pseudostraminea. Based on the phylogenetic results, we redescribed these two species using modern taxonomic concepts in Hypocrea/Trichoderma.