ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Publication Date: 2009-10-23
    Description: Maturation of precursor transfer RNA (pre-tRNA) includes excision of the 5' leader and 3' trailer sequences, removal of introns and addition of the CCA terminus. Nucleotide modifications are incorporated at different stages of tRNA processing, after the RNA molecule adopts the proper conformation. In bacteria, tRNA(Ile2) lysidine synthetase (TilS) modifies cytidine into lysidine (L; 2-lysyl-cytidine) at the first anticodon of tRNA(Ile2) (refs 4-9). This modification switches tRNA(Ile2) from a methionine-specific to an isoleucine-specific tRNA. However, the aminoacylation of tRNA(Ile2) by methionyl-tRNA synthetase (MetRS), before the modification by TilS, might lead to the misincorporation of methionine in response to isoleucine codons. The mechanism used by bacteria to avoid this pitfall is unknown. Here we show that the TilS enzyme specifically recognizes and modifies tRNA(Ile2) in its precursor form, thereby avoiding translation errors. We identified the lysidine modification in pre-tRNA(Ile2) isolated from RNase-E-deficient Escherichia coli and did not detect mature tRNA(Ile2) lacking this modification. Our kinetic analyses revealed that TilS can modify both types of RNA molecule with comparable efficiencies. X-ray crystallography and mutational analyses revealed that TilS specifically recognizes the entire L-shape structure in pre-tRNA(Ile2) through extensive interactions coupled with sequential domain movements. Our results demonstrate how TilS prevents the recognition of tRNA(Ile2) by MetRS and achieves high specificity for its substrate. These two key points form the basis for maintaining the fidelity of isoleucine codon translation in bacteria. Our findings also provide a rationale for the necessity of incorporating specific modifications at the precursor level during tRNA biogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nakanishi, Kotaro -- Bonnefond, Luc -- Kimura, Satoshi -- Suzuki, Tsutomu -- Ishitani, Ryuichiro -- Nureki, Osamu -- England -- Nature. 2009 Oct 22;461(7267):1144-8. doi: 10.1038/nature08474.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Information, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, Kanagawa 225-8501, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19847269" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acyl-tRNA Synthetases/*chemistry/genetics/*metabolism ; Apoproteins/genetics/metabolism ; Bacillus subtilis ; Bacterial Proteins/*chemistry/genetics/*metabolism ; Base Sequence ; Catalytic Domain ; Crystallography, X-Ray ; Escherichia coli ; Geobacillus ; Kinetics ; Lysine/analogs & derivatives/metabolism ; Mass Spectrometry ; Models, Molecular ; Molecular Sequence Data ; *Protein Biosynthesis ; Pyrimidine Nucleosides/metabolism ; RNA, Transfer, Ile/genetics/metabolism ; Substrate Specificity
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 2011-05-13
    Description: Protein translocation across the bacterial membrane, mediated by the secretory translocon SecYEG and the SecA ATPase, is enhanced by proton motive force and membrane-integrated SecDF, which associates with SecYEG. The role of SecDF has remained unclear, although it is proposed to function in later stages of translocation as well as in membrane protein biogenesis. Here, we determined the crystal structure of Thermus thermophilus SecDF at 3.3 A resolution, revealing a pseudo-symmetrical, 12-helix transmembrane domain belonging to the RND superfamily and two major periplasmic domains, P1 and P4. Higher-resolution analysis of the periplasmic domains suggested that P1, which binds an unfolded protein, undergoes functionally important conformational changes. In vitro analyses identified an ATP-independent step of protein translocation that requires both SecDF and proton motive force. Electrophysiological analyses revealed that SecDF conducts protons in a manner dependent on pH and the presence of an unfolded protein, with conserved Asp and Arg residues at the transmembrane interface between SecD and SecF playing essential roles in the movements of protons and preproteins. Therefore, we propose that SecDF functions as a membrane-integrated chaperone, powered by proton motive force, to achieve ATP-independent protein translocation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3697915/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3697915/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tsukazaki, Tomoya -- Mori, Hiroyuki -- Echizen, Yuka -- Ishitani, Ryuichiro -- Fukai, Shuya -- Tanaka, Takeshi -- Perederina, Anna -- Vassylyev, Dmitry G -- Kohno, Toshiyuki -- Maturana, Andres D -- Ito, Koreaki -- Nureki, Osamu -- R01 GM074840/GM/NIGMS NIH HHS/ -- England -- Nature. 2011 May 11;474(7350):235-8. doi: 10.1038/nature09980.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21562494" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Arginine/metabolism ; Asparagine/metabolism ; Bacterial Proteins/*chemistry/*metabolism ; Crystallography, X-Ray ; Hydrogen-Ion Concentration ; Membrane Proteins/*chemistry/*metabolism ; Membrane Transport Proteins/*chemistry/*metabolism ; Models, Biological ; Models, Molecular ; Nuclear Magnetic Resonance, Biomolecular ; Periplasm/chemistry/metabolism ; Protein Structure, Tertiary ; Protein Transport ; Protein Unfolding ; Proton-Motive Force ; Static Electricity ; Structure-Activity Relationship ; Thermus thermophilus/*chemistry/cytology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Publication Date: 2012-01-24
    Description: Channelrhodopsins (ChRs) are light-gated cation channels derived from algae that have shown experimental utility in optogenetics; for example, neurons expressing ChRs can be optically controlled with high temporal precision within systems as complex as freely moving mammals. Although ChRs have been broadly applied to neuroscience research, little is known about the molecular mechanisms by which these unusual and powerful proteins operate. Here we present the crystal structure of a ChR (a C1C2 chimaera between ChR1 and ChR2 from Chlamydomonas reinhardtii) at 2.3 A resolution. The structure reveals the essential molecular architecture of ChRs, including the retinal-binding pocket and cation conduction pathway. This integration of structural and electrophysiological analyses provides insight into the molecular basis for the remarkable function of ChRs, and paves the way for the precise and principled design of ChR variants with novel properties.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4160518/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4160518/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kato, Hideaki E -- Zhang, Feng -- Yizhar, Ofer -- Ramakrishnan, Charu -- Nishizawa, Tomohiro -- Hirata, Kunio -- Ito, Jumpei -- Aita, Yusuke -- Tsukazaki, Tomoya -- Hayashi, Shigehiko -- Hegemann, Peter -- Maturana, Andres D -- Ishitani, Ryuichiro -- Deisseroth, Karl -- Nureki, Osamu -- Howard Hughes Medical Institute/ -- England -- Nature. 2012 Jan 22;482(7385):369-74. doi: 10.1038/nature10870.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22266941" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacteriorhodopsins/chemistry ; Binding Sites ; Cations/*metabolism ; Cattle ; Chlamydomonas reinhardtii/*chemistry/genetics ; Crystallography, X-Ray ; Ion Channel Gating/*radiation effects ; Ion Channels/*chemistry/genetics/radiation effects ; *Light ; Models, Molecular ; Mutation ; Protein Conformation ; Recombinant Fusion Proteins/chemistry/genetics/radiation effects ; Retinaldehyde/metabolism ; Rhodopsin/*chemistry/genetics/radiation effects ; Schiff Bases/chemistry ; Static Electricity
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 2014-04-18
    Description: Newly synthesized membrane proteins must be accurately inserted into the membrane, folded and assembled for proper functioning. The protein YidC inserts its substrates into the membrane, thereby facilitating membrane protein assembly in bacteria; the homologous proteins Oxa1 and Alb3 have the same function in mitochondria and chloroplasts, respectively. In the bacterial cytoplasmic membrane, YidC functions as an independent insertase and a membrane chaperone in cooperation with the translocon SecYEG. Here we present the crystal structure of YidC from Bacillus halodurans, at 2.4 A resolution. The structure reveals a novel fold, in which five conserved transmembrane helices form a positively charged hydrophilic groove that is open towards both the lipid bilayer and the cytoplasm but closed on the extracellular side. Structure-based in vivo analyses reveal that a conserved arginine residue in the groove is important for the insertion of membrane proteins by YidC. We propose an insertion mechanism for single-spanning membrane proteins, in which the hydrophilic environment generated by the groove recruits the extracellular regions of substrates into the low-dielectric environment of the membrane.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kumazaki, Kaoru -- Chiba, Shinobu -- Takemoto, Mizuki -- Furukawa, Arata -- Nishiyama, Ken-ichi -- Sugano, Yasunori -- Mori, Takaharu -- Dohmae, Naoshi -- Hirata, Kunio -- Nakada-Nakura, Yoshiko -- Maturana, Andres D -- Tanaka, Yoshiki -- Mori, Hiroyuki -- Sugita, Yuji -- Arisaka, Fumio -- Ito, Koreaki -- Ishitani, Ryuichiro -- Tsukazaki, Tomoya -- Nureki, Osamu -- England -- Nature. 2014 May 22;509(7501):516-20. doi: 10.1038/nature13167. Epub 2014 Apr 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan [2] Global Research Cluster, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan [3]. ; 1] Faculty of Life Sciences, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto 603-8555, Japan [2]. ; 1] Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan [2] Global Research Cluster, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan. ; Department of Systems Biology, Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan. ; Cryobiofrontier Research Center, Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka, Iwate 020-8550, Japan. ; Theoretical Molecular Science Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan. ; Global Research Cluster, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan. ; SR Life Science Instrumentation Unit, RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan. ; Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan. ; Department of Bioengineering Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan. ; Institute for Virus Research, Kyoto University, Shogoin Kawara-cho, Sakyo-ku, Kyoto 606-8507, Japan. ; Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan. ; Faculty of Life Sciences, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto 603-8555, Japan. ; 1] Department of Systems Biology, Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan [2] JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24739968" target="_blank"〉PubMed〈/a〉
    Keywords: Arginine/metabolism ; Bacillus/*chemistry ; Bacterial Proteins/*chemistry/*metabolism ; Cell Membrane/chemistry/*metabolism ; Conserved Sequence ; Crystallography, X-Ray ; Hydrophobic and Hydrophilic Interactions ; Membrane Transport Proteins/*chemistry/*metabolism ; Molecular Chaperones/chemistry/metabolism ; Protein Folding ; Static Electricity ; Structure-Activity Relationship
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Publication Date: 2012-10-16
    Description: PIWI-interacting RNAs (piRNAs) silence transposons to maintain genome integrity in animal germ lines. piRNAs are classified as primary and secondary piRNAs, depending on their biogenesis machinery. Primary piRNAs are processed from long non-coding RNA precursors transcribed from piRNA clusters in the genome through the primary processing pathway. Although the existence of a ribonuclease participating in this pathway has been predicted, its molecular identity remained unknown. Here we show that Zucchini (Zuc), a mitochondrial phospholipase D (PLD) superfamily member, is an endoribonuclease essential for primary piRNA biogenesis. We solved the crystal structure of Drosophila melanogaster Zuc (DmZuc) at 1.75 A resolution. The structure revealed that DmZuc has a positively charged, narrow catalytic groove at the dimer interface, which could accommodate a single-stranded, but not a double-stranded, RNA. DmZuc and the mouse homologue MmZuc (also known as Pld6 and MitoPLD) showed endoribonuclease activity for single-stranded RNAs in vitro. The RNA cleavage products bear a 5'-monophosphate group, a hallmark of mature piRNAs. Mutational analyses revealed that the conserved active-site residues of DmZuc are critical for the ribonuclease activity in vitro, and for piRNA maturation and transposon silencing in vivo. We propose a model for piRNA biogenesis in animal germ lines, in which the Zuc endoribonuclease has a key role in primary piRNA maturation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nishimasu, Hiroshi -- Ishizu, Hirotsugu -- Saito, Kuniaki -- Fukuhara, Satoshi -- Kamatani, Miharu K -- Bonnefond, Luc -- Matsumoto, Naoki -- Nishizawa, Tomohiro -- Nakanaga, Keita -- Aoki, Junken -- Ishitani, Ryuichiro -- Siomi, Haruhiko -- Siomi, Mikiko C -- Nureki, Osamu -- England -- Nature. 2012 Nov 8;491(7423):284-7. doi: 10.1038/nature11509. Epub 2012 Oct 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, Tokyo 113-0032, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23064230" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Biocatalysis ; Catalytic Domain ; Crystallography, X-Ray ; DNA Transposable Elements/genetics ; Drosophila Proteins/*chemistry/*metabolism ; Drosophila melanogaster/*enzymology/genetics ; Endoribonucleases/*chemistry/*metabolism ; Gene Silencing ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; RNA, Small Interfering/biosynthesis/chemistry/genetics/*metabolism ; Structure-Activity Relationship
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Publication Date: 2006-07-01
    Description: Glutaminyl-transfer RNA (Gln-tRNA(Gln)) in archaea is synthesized in a pretranslational amidation of misacylated Glu-tRNA(Gln) by the heterodimeric Glu-tRNA(Gln) amidotransferase GatDE. Here we report the crystal structure of the Methanothermobacter thermautotrophicus GatDE complexed to tRNA(Gln) at 3.15 angstroms resolution. Biochemical analysis of GatDE and of tRNA(Gln) mutants characterized the catalytic centers for the enzyme's three reactions (glutaminase, kinase, and amidotransferase activity). A 40 angstrom-long channel for ammonia transport connects the active sites in GatD and GatE. tRNA(Gln) recognition by indirect readout based on shape complementarity of the D loop suggests an early anticodon-independent RNA-based mechanism for adding glutamine to the genetic code.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oshikane, Hiroyuki -- Sheppard, Kelly -- Fukai, Shuya -- Nakamura, Yuko -- Ishitani, Ryuichiro -- Numata, Tomoyuki -- Sherrer, R Lynn -- Feng, Liang -- Schmitt, Emmanuelle -- Panvert, Michel -- Blanquet, Sylvain -- Mechulam, Yves -- Soll, Dieter -- Nureki, Osamu -- New York, N.Y. -- Science. 2006 Jun 30;312(5782):1950-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Information, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama-shi, Kanagawa 226-8501, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16809540" target="_blank"〉PubMed〈/a〉
    Keywords: Acylation ; Adenosine Triphosphate/metabolism ; Ammonia/metabolism ; Anticodon ; Binding Sites ; Catalytic Domain ; Computer Simulation ; Crystallography, X-Ray ; Dimerization ; *Genetic Code ; Glutamine/*metabolism ; Hydrogen Bonding ; Magnesium/metabolism ; Methanobacteriaceae/*enzymology/genetics ; Models, Molecular ; Mutation ; Nitrogenous Group Transferases/*chemistry/*metabolism ; Nucleic Acid Conformation ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; RNA, Archaeal/*chemistry/metabolism ; RNA, Transfer, Gln/*chemistry/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Publication Date: 2014-04-20
    Description: Tight junctions are cell-cell adhesion structures in epithelial cell sheets that surround organ compartments in multicellular organisms and regulate the permeation of ions through the intercellular space. Claudins are the major constituents of tight junctions and form strands that mediate cell adhesion and function as paracellular barriers. We report the structure of mammalian claudin-15 at a resolution of 2.4 angstroms. The structure reveals a characteristic beta-sheet fold comprising two extracellular segments, which is anchored to a transmembrane four-helix bundle by a consensus motif. Our analyses suggest potential paracellular pathways with distinctive charges on the extracellular surface, providing insight into the molecular basis of ion homeostasis across tight junctions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Suzuki, Hiroshi -- Nishizawa, Tomohiro -- Tani, Kazutoshi -- Yamazaki, Yuji -- Tamura, Atsushi -- Ishitani, Ryuichiro -- Dohmae, Naoshi -- Tsukita, Sachiko -- Nureki, Osamu -- Fujiyoshi, Yoshinori -- New York, N.Y. -- Science. 2014 Apr 18;344(6181):304-7. doi: 10.1126/science.1248571.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cellular and Structural Physiology Institute, Nagoya University, Chikusa, Nagoya 464-8601, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24744376" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Claudins/*chemistry ; Crystallography, X-Ray ; Mice ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits/chemistry ; Static Electricity ; Tight Junctions/*chemistry/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...