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11.
Yosuke Demizu Yu‐u Yabuki Mitsunobu Doi Yukiko Sato Masakazu Tanaka Masaaki Kurihara 《Journal of peptide science》2012,18(7):466-475
A pair of l ‐leucine (l ‐Leu) and d ‐leucine (d ‐Leu) was incorporated into α‐aminoisobutyric acid (Aib) peptide segments. The dominant conformations of four hexapeptides, Boc‐l ‐Leu‐Aib‐Aib‐Aib‐Aib‐l ‐Leu‐OMe (1a), Boc‐d ‐Leu‐Aib‐Aib‐Aib‐Aib‐l ‐Leu‐OMe (1b), Boc‐Aib‐Aib‐l ‐Leu‐l ‐Leu‐Aib‐Aib‐OMe (2a), and Boc‐Aib‐Aib‐d ‐Leu‐l ‐Leu‐Aib‐Aib‐OMe (2b), were investigated by IR, 1H NMR, CD spectra, and X‐ray crystallographic analysis. All peptides 1a,b and 2a,b formed 310‐helical structures in solution. X‐ray crystallographic analysis revealed that right‐handed (P) 310‐helices were present in 1a and 1b and a mixture of right‐handed (P) and left‐handed (M) 310‐helices was present in 2b in their crystalline states. Copyright © 2012 European Peptide Society and John Wiley & Sons, Ltd. 相似文献
12.
13.
Shigeaki Nonoyama Mitsunobu Shimadzu Hano Toru Kuniaki Seyama Hiroyuki Nunoi Michael Neubauer Jun-ichi Yata Hans D. Ochs 《Human genetics》1997,99(5):624-627
X-linked hyper-IgM syndrome (XHIM) is a rare primary immunodeficiency caused by a defective CD40 ligand. We identified mutations
of the CD40 ligand gene in 13 unrelated Japanese XHIM patients. Of the four patients with missense mutations, one had a mutation
within the transmembrane domain, and the three others had mutations affecting the TNF homology region of the extracellular
domain. Two of the missense mutations resulted in the substitution of amino acids that are highly conserved in TNF family
proteins. Three patients had nonsense mutations, all of which resulted in the truncation of the TNF homology domain of the
CD40 ligand. Three patients had genomic DNA deletions of 2, 3 or 4 nucleotides, respectively. All of the deletions were flanked
by direct repeat sequences, suggesting that these deletions were caused by slipped mispairing. Three patients had mutations
within introns resulting in altered splicing, and multiple splicing products were found in one patient. Thus, each of the
13 Japanese patients had different mutations, 9 of them being novel mutations. These results indicate that mutations in XHIM
are highly heterogeneous, although codon 140 seems to be a hot spot of the CD40 ligand gene since two additional point mutations
were located at Trp 140, bringing the total numbers of mutations affecting codon 140 to six. In one XHIM family with a missense
mutation, prenatal diagnosis was performed by single-strand conformation polymorphism analysis of genomic DNA of a male fetus.
Received: 20 August 1996 相似文献
14.
Circularly polarized luminescence of helically assembled pyrene π‐stacks on RNA and DNA duplexes
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Mitsunobu Nakamura Fuyuki Ota Tadao Takada Kazuo Akagi Kazushige Yamana 《Chirality》2018,30(5):602-608
In this report, we describe the circularly polarized luminescence (CPL) of the RNA duplexes having one to four 2′‐O‐pyrene modified uridines ( Upy ) and the DNA duplexes having two, four, and six pyrene modified non‐nucleosidic linkers ( Py ). Both the pyrene π‐stack arrays formed on the RNA and DNA double helical structures exhibited pyrene excimer fluorescence. In the pyrene‐modified RNA systems, the RNA duplex having four Upy s gives CPL emission with glum value of <0.01 at 480 nm. The structure of pyrene stacks on the RNA duplex may be rigidly regulated with increase in the Upy domains, which resulted in the CPL emission. In the DNA systems, the pyrene‐modified duplexes containing two and four Pys exhibited CPL emission with glum values of <0.001 at 505 nm. The pyrene π‐stack arrays presented here show CPL emission. However, the glum values are relatively small when compared with our previous system consisting of the pyrene‐zipper arrays on RNA. 相似文献
15.
Segregative cell division and the cytoskeleton in two species of the genus Struvea (Cladophorales,Ulvophyceae, Chlorophyta)
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Kazuo Okuda Satoko Sekida Ami Hasebe Misa Iwabuchi Mitsunobu Kamiya Tasuku Hishinuma 《Phycological Research》2016,64(4):219-229
The detailed segregative cell division (SCD) processes and changes in the arrangement of cortical microtubules and actin filaments were examined in two species of Struvea. SCD was initiated by the appearance of annular constrictions along the lateral side of a mother cell. The constrictions decreased in diameter, became thin, tubular in shape, and pinched the protoplasm of the mother cell into several protoplasmic sections. The protoplasmic sections expanded and developed into daughter cells, which appressed each other, and were arranged in a single row. Lateral branches protruded from the upper parts of the daughter cells. The protoplasm of the lateral branches was divided by secondary SCDs and was distributed amongst the new daughter cells. SCD and lateral branch formation were essential for morphogenesis in Struvea. Cortical microtubules were arranged parallel and longitudinally to the cell axis before SCD. When SCD was initiated, there was considerable undulation of the cortical microtubules and several transverse bundles appeared in the cytoplasmic zone where annular constrictions occurred. A microtubule‐disrupting drug (amiprophos methyl) inhibited SCD. Actin filaments maintained reticulate patterns before and during SCD. These results demonstrated that SCD in Struvea species was quite distinct from that in Dictyosphaeria cavernosa reported previously. 相似文献
16.
Edashige K Ohta S Tanaka M Kuwano T Valdez DM Hara T Jin B Takahashi S Seki S Koshimoto C Kasai M 《Biology of reproduction》2007,77(2):365-375
The permeability to water and cryoprotectants of the plasma membrane is crucial to the successful cryopreservation of embryos. Previously, we have shown in mouse morulae that water and glycerol move across the plasma membrane by facilitated diffusion, and we have suggested that aquaporin 3 plays an important role in their movement. In the present study, we clarify the contribution of aquaporin 3 to the movement of water and various cryoprotectants in mouse morulae by measuring the Arrhenius activation energies for permeability to cryoprotectants and water, through artificial expression of aquaporin 3 using Aqp3 cRNA in mouse oocytes, and by suppressing the expression of aquaporin 3 in morulae by injecting double-stranded RNA of Aqp3 at the one-cell zygote stage. The results show that aquaporin 3 plays an important role in the facilitated diffusion of water, glycerol, and ethylene glycol, but not of acetamide and dimethylsulfoxide. On the other hand, in a propylene glycol solution, aquaporin 3 in morulae transported neither propylene glycol nor water by facilitated diffusion, probably because of strong water-solute interactions. These results provide important information for understanding the permeability of the plasma membrane of the mouse embryo. 相似文献
17.
18.
Yusuke Hasegawa Tadao Takada Mitsunobu Nakamura Kazushige Yamana 《Bioorganic & medicinal chemistry letters》2017,27(15):3555-3557
We describe the synthesis, binding, and electrochemical properties of ferrocene-conjugated oligonucleotides (Fc-oligos). The key step for the preparation of Fc-oligos contains the coupling of vinylferrocene to 5-iododeoxyuridine via Heck reaction. The Fc-conjugated deoxyuridine phosphoramidite was used in the Fc-oligonucleotide synthesis. We show that thiol-modified Fc-oligos deposited onto gold electrodes possess potential ability in electrochemical detection of DNA base mismatch. 相似文献
19.
Marginal distribution and high heterozygosity of asexual Caloglossa vieillardii (Delesseriaceae,Rhodophyta) along the Australian coasts
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In animals and land plants, many asexual species originate through inter‐ or intraspecific crosses, and such heterozygous asexuals frequently are more abundant than their sexual relatives in marginal habitats. Although asexual species have been reported in various macroalgal taxa, detailed information regarding their distribution, heterozygosity, and origin is limited. Because many asexual tetrasporophyte strains of Caloglossa vieillardii have been isolated from South Australia, far from their core tropical habitats, we re‐examined the distribution range of asexual C. vieillardii and genotyped these and other western Pacific strains using an actin gene marker. We confirmed the marginal distribution of the asexuals; however, a small patch of sexual thalli was newly discovered 450 km further west from asexual populations in South Australia. Three heterozygous genotypes and one homozygous genotypes were detected from nine asexual populations; 21 heterozygous strains were obligately asexual, but one homozygous strain suddenly produced sexual gametophytes after several years of culture. We hypothesized that the most abundant heterozygous genotype (defined as type 3/4) in asexual populations occurred by a cross between type 3 and type 4 allele gametophytes, both of which were isolated from the Australian coasts. In the crossing experiments, certain combinations between type 3 females and type 4 males produced tetrasporophytes, which recycled successive tetrasporophytes. In the culture experiments, whereas both sexual and asexual strains successfully produced tetraspores at 12°C, no sexual strains released carpospores below 14°C. However, it is uncertain whether this slight difference of maturation temperature was related to the marginal distribution of asexual C. vieillardii. 相似文献
20.
Nobuhiro Akuzawa Makoto Kurabayashi Tsukasa Suzuki Daisuke Yoshinari Mitsunobu Kobayashi Yoshifumi Tanahashi Fujio Makita Ryusei Saito 《Diagnostic pathology》2017,12(1):74