Observation of the Color-Suppressed Decay B̅ 0→D0π0

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<教職大学院>反省的実践家としての教師の成長過程解明への一考察― カード構造化法で見えてきたこと ―(報告書の概要)

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実践哲学ノート（34）

application/pdfDie vorliegende Arbeit forscht nach dem Sinn des Menschen als menschliches Naturwesens. Der Kern des Sinnes des Menschen ist aber nichts anderes als Menschlichkeit (Humanitat). Also behandle ich die praktische Philosophie uberhaupt, namentlich die menschliche praktische Philosophie Yoshiaki Utsunomiyas. Dabei zugleich mochte ich sein Denken selbst und auch seine Denkweise lernen. Danach mochte ich den Sinn des menschlichen Naturwesens auf Grund der Menschlichkeit (Humanitat) aufklaren und ferner den Menschen an sich selbst als systematische Totalitat der drei Lebenstatigkeiten, die aus Konsumieren, Produzieren und Verkehren bestehen, zeigen. Der Sinn des Menschen enthalt die Menschlichkeit (Humanitat) als sein ubergreifendes Moment in sich. Daher mussten wir vor allem die Menschlichkeit (Humanitat) untersuchen.departmental bulletin pape

センタン イリョウ ニ トモナウ セイメイ リンリジョウ ノ ショモンダイ

video/mp4講演者所属: 大阪弁護士会vide

Full-length MYRF is a type-II membrane protein.

<p>(A) Predicted sequence features of MYRF and sequence diagrams of various MYRF constructs used for experiments. (B) Western blot of HeLa cells transfected with pcDNA3 and 3F-MYRF. (C) The top band of HeLa cells that were transfected with 5M-MYRF-3F has the same electrophoretic mobility as full-length protein products for the same construct that were obtained with an <i>in vitro</i> translation system. (D) Full-length forms of MYRF consist of two closely spaced bands that represent glycosylated and unglycosylated full-length MYRF, respectively (indicated by the two arrows). (E) HeLa cells transfected with 3F-MYRF were disrupted using a Dounce-type homogenizer, and then centrifuged at 200× <i>g</i> for 5 min to obtain a supernatant fraction. It was mixed with 0.1 volume of each of the following chemicals: 5 M NaCl, 1 M Na₂CO₃ (pH 11), and 10% SDS. After incubation for 20 min at room temperature, mixtures were centrifuged at 20,000× <i>g</i> for 15 min at 4°C to separate supernatant (S) from pellet (P). Calnexin, a known integral membrane protein, served as a control. (F) Membrane topology of GFP-MYRF-3F and 3F-MYRF-L690A-GFP in HeLa cells. When cell membranes were selectively permeated by digitonin, FLAG IF signals of GFP-MYRF-3F could not be detected, indicating that the C-terminus of MYRF is located within the ER lumen. In contrast, FLAG IF signals of 3F-MYRF-L690A-GFP were robustly detected even when cell membranes were selectively permeated by digitonin, indicating that the N-terminus of full-length MYRF is located on the cytoplasmic side of ER membranes. Scale bar, 10 µm.</p

Full-length MYRF is generated as a membrane protein.

<p>(A) Predicted sequence features of MYRF and sequence diagrams of various MYRF constructs used for IF microscopy. Stars in blue indicate predicted NLSs at K₂₄₅KRK₂₄₈ and K₄₈₂KGK₄₈₅. (B) IF images of GFP-MYRF, MYRF-GFP, MYRFΔTM-GFP, and MYRF-1:756-GFP in HeLa cells. (C) IF image of 3F-MYRF-GFP in HeLa cells. Scale bar, 10 µm.</p

The ICA domain catalyzes trimerization-dependent auto-proteolysis in entirely distinct protein and cellular contexts.

<p>(A) In K1F bacteriophage, the C-terminal ICA domain within each tailspike endosialidase auto-catalytically removes itself following tailspike trimerization, guiding maturation of the six tailspikes surrounding the phage tail (shown for phage K1E, adapted from <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.1001624#pbio.1001624-Leiman1" target="_blank">[55]</a>). (B) Once generated as a type-II membrane protein, the ICA domain is thought to induce the trimerization of MYRF, upon which it cleaves itself, generating two independent trimers. The N-terminal trimer translocates to the nucleus and activates the transcription of myelin genes by direct DNA binding. The transcriptional role of the N-terminal trimer serves to promote the terminal differentiation of OLs, likely aided by an as-yet-unknown function of the C-terminal trimer that remains in the ER.</p

Auto-processing is essential for the functions of MYRF.

<p>(A) The transcriptional activity of various MYRF constructs was estimated by their ability to activate the transcription of <i>Edn2</i> in HeLa cells. Values are means ± SEM. (B) Examples of transfected CG4 cells that matured to express MBP or O1. (C) Quantification of the proportion of transfected CG4 cells expressing MBP or O1. Values are means ± SEM. *<i>p</i><0.05, **<i>p</i><0.01, and ***<i>p</i><0.001. Scale bar, 10 µm.</p

The ICA domain autonomously mediates the proteolytic processing of MYRF.

<p>(A) Multiple sequence alignment of the ICA domains from eukaryotes, a bacterium, and a phage, generated with ClustalW <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.1001624#pbio.1001624-Larkin1" target="_blank">[54]</a>. Strictly conserved residues are shown in red. The numbering system is based on MYRF. (B) The auto-processing mechanism for MYRF postulated based on the ICA domain and its known properties. (C) Western blots of HeLa cells transfected with various MYRF constructs, showing the effects of mutations in the ICA domain on the proteolytic processing of MYRF. (D) IF image of 3F-MYRF-S578A and 3F-MYRF-K583A in HeLa cells. (E) The amino acid sequence of MYRF (residues N567-R692) was mapped onto the crystal structure of an ICA domain (PDB ID: 3GW6) using the alignment shown in <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.1001624#pbio.1001624.s003" target="_blank">Figure S3A</a>. In the zoomed active site are shown two key catalytic residues (S578 and K583, both belonging to the same subunit) in stick model and two strictly conserved residues (V670 of one subunit and G626 of a different subunit) in space filling model. Shown below are L683, I687, and L690 that were predicted to form a leucine zipper. For visual clarity, clipped images were generated when deemed necessary. (F) (Left) Western blot showing that the proteolytic processing of MYRF is independent of its membrane insertion. MYRF-1:756 is a mutant truncated before the TM domain at L756. (Middle) Western blot showing the proteolytic processing of MYRF-319:708 in HeLa cells and <i>E. coli</i>. (Right) Western blot showing the normal processing of full-length MYRF in budding yeast. Scale bar, 10 µm.</p

The N-terminal trimer is formed by the ICA domain and enters the nucleus.

<p>(A) Predicted sequence features of MYRF and sequence diagrams of various MYRF constructs used for experiments. (B) Western blots showing co-immunoprecipitation results for the MYRF constructs. “Input” was incubated with FLAG antibody-coated beads and then spun down to separate “Sup” from “Bead” fractions. The failure of MYRF-1:577 to homo-oligomerize demonstrated the importance of the ICA domain for the N-terminal trimer formation. (C) When the NLSs (NLS1 and NLS2) were deleted, the nuclear translocation of the N-terminal trimer was partially blocked. Scale bar, 20 µm.</p