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: 2002-04-16
    Description: One of the most complex biosynthetic processes in metallobiochemistry is the assembly of nitrogenase, the key enzyme in biological nitrogen fixation. We describe here the crystal structure of an iron-molybdenum cofactor-deficient form of the nitrogenase MoFe protein, into which the cofactor is inserted in the final step of MoFe protein assembly. The MoFe protein folds as a heterotetramer containing two copies each of the homologous alpha and beta subunits. In this structure, one of the three alpha subunit domains exhibits a substantially changed conformation, whereas the rest of the protein remains essentially unchanged. A predominantly positively charged funnel is revealed; this funnel is of sufficient size to accommodate insertion of the negatively charged cofactor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schmid, Benedikt -- Ribbe, Markus W -- Einsle, Oliver -- Yoshida, Mika -- Thomas, Leonard M -- Dean, Dennis R -- Rees, Douglas C -- Burgess, Barbara K -- New York, N.Y. -- Science. 2002 Apr 12;296(5566):352-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Chemistry and Chemical Engineering, Mail Code 147-75CH, Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11951047" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Azotobacter vinelandii/*enzymology ; Binding Sites ; Crystallization ; Crystallography, X-Ray ; Dimerization ; Hydrogen Bonding ; Models, Molecular ; Molecular Sequence Data ; Molybdoferredoxin/*chemistry/genetics/*metabolism ; Protein Conformation ; Protein Folding ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Static Electricity ; Surface Properties
    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 ...
  • 2
    Publication Date: 2002-09-07
    Description: A high-resolution crystallographic analysis of the nitrogenase MoFe-protein reveals a previously unrecognized ligand coordinated to six iron atoms in the center of the catalytically essential FeMo-cofactor. The electron density for this ligand is masked in structures with resolutions lower than 1.55 angstroms, owing to Fourier series termination ripples from the surrounding iron and sulfur atoms in the cofactor. The central atom completes an approximate tetrahedral coordination for the six iron atoms, instead of the trigonal coordination proposed on the basis of lower resolution structures. The crystallographic refinement at 1.16 angstrom resolution is consistent with this newly detected component being a light element, most plausibly nitrogen. The presence of a nitrogen atom in the cofactor would have important implications for the mechanism of dinitrogen reduction by nitrogenase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Einsle, Oliver -- Tezcan, F Akif -- Andrade, Susana L A -- Schmid, Benedikt -- Yoshida, Mika -- Howard, James B -- Rees, Douglas C -- New York, N.Y. -- Science. 2002 Sep 6;297(5587):1696-700.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Division of Chemistry and Chemical Engineering, California Institute of Technology, Mail Code 147-75CH, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12215645" target="_blank"〉PubMed〈/a〉
    Keywords: Azotobacter vinelandii/enzymology ; Coenzymes/*chemistry/metabolism ; Crystallography, X-Ray ; Ligands ; Models, Molecular ; Molybdoferredoxin/*chemistry/metabolism ; Nitrogen/chemistry ; Nitrogenase/*chemistry/metabolism ; Protein Conformation
    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 ...
  • 3
    Publication Date: 2011-04-16
    Description: The formate transporter FocA was described to switch its mode of operation from a passive export channel at high external pH to a secondary active formate/H(+) importer at low pH. The crystal structure of Salmonella typhimurium FocA at pH 4.0 shows that this switch involves a major rearrangement of the amino termini of individual protomers in the pentameric channel. The amino-terminal helices open or block transport in a concerted, cooperative action that indicates how FocA is gated in a pH-dependent way. Electrophysiological studies show that the protein acts as a specific formate channel at pH 7.0 and that it closes upon a shift of pH to 5.1.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lu, Wei -- Du, Juan -- Wacker, Tobias -- Gerbig-Smentek, Elke -- Andrade, Susana L A -- Einsle, Oliver -- New York, N.Y. -- Science. 2011 Apr 15;332(6027):352-4. doi: 10.1126/science.1199098.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lehrstuhl fur Biochemie, Institut fur organische Chemie und Biochemie, Albert-Ludwigs-Universitat Freiburg, Albertstrasse 21, 79104 Freiburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21493860" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/*chemistry/isolation & purification/*metabolism ; Crystallization ; Crystallography, X-Ray ; Formates/*metabolism ; Hydrogen-Ion Concentration ; *Ion Channel Gating ; Ion Channels/*chemistry/isolation & purification/*metabolism ; Ion Transport ; Models, Molecular ; Protein Conformation ; Protein Multimerization ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Subunits/chemistry/metabolism ; Salmonella typhimurium/*chemistry/metabolism ; Static Electricity
    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 ...
  • 4
    Publication Date: 2014-09-27
    Description: The mechanism of nitrogenase remains enigmatic, with a major unresolved issue concerning how inhibitors and substrates bind to the active site. We report a crystal structure of carbon monoxide (CO)-inhibited nitrogenase molybdenum-iron (MoFe)-protein at 1.50 angstrom resolution, which reveals a CO molecule bridging Fe2 and Fe6 of the FeMo-cofactor. The mu2 binding geometry is achieved by replacing a belt-sulfur atom (S2B) and highlights the generation of a reactive iron species uncovered by the displacement of sulfur. The CO inhibition is fully reversible as established by regain of enzyme activity and reappearance of S2B in the 1.43 angstrom resolution structure of the reactivated enzyme. The substantial and reversible reorganization of the FeMo-cofactor accompanying CO binding was unanticipated and provides insights into a catalytically competent state of nitrogenase.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4205161/" 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/PMC4205161/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Spatzal, Thomas -- Perez, Kathryn A -- Einsle, Oliver -- Howard, James B -- Rees, Douglas C -- GM45162/GM/NIGMS NIH HHS/ -- P41GM103393/GM/NIGMS NIH HHS/ -- P41RR001209/RR/NCRR NIH HHS/ -- R01 GM045162/GM/NIGMS NIH HHS/ -- R37 GM045162/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2014 Sep 26;345(6204):1620-3. doi: 10.1126/science.1256679.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Division of Chemistry and Chemical Engineering, MailCode 114-96, California Institute of Technology, Pasadena, CA 91125, USA. spatzal@caltech.edu dcrees@caltech.edu. ; Howard Hughes Medical Institute and Division of Chemistry and Chemical Engineering, MailCode 114-96, California Institute of Technology, Pasadena, CA 91125, USA. ; Institut fur Biochemie, Albert-Ludwigs-Universitat Freiburg, 79104 Freiburg, Germany. BIOSS Centre for Biological Signalling Studies, Albert-Ludwigs-Universitat Freiburg, 79104 Freiburg, Germany. ; Howard Hughes Medical Institute and Division of Chemistry and Chemical Engineering, MailCode 114-96, California Institute of Technology, Pasadena, CA 91125, USA. Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25258081" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon Monoxide/*chemistry ; Catalytic Domain ; Crystallography, X-Ray ; Enzyme Activation ; Ligands ; Molybdoferredoxin/antagonists & inhibitors/*chemistry ; *Nitrogen Fixation ; Protein Binding ; Sulfur/chemistry
    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 ...
  • 5
    Publication Date: 2011-10-11
    Description: Fructose-1,6-bisphosphate (FBP) aldolase/phosphatase is a bifunctional, thermostable enzyme that catalyses two subsequent steps in gluconeogenesis in most archaea and in deeply branching bacterial lineages. It mediates the aldol condensation of heat-labile dihydroxyacetone phosphate (DHAP) and glyceraldehyde-3-phosphate (GAP) to FBP, as well as the subsequent, irreversible hydrolysis of the product to yield the stable fructose-6-phosphate (F6P) and inorganic phosphate; no reaction intermediates are released. Here we present a series of structural snapshots of the reaction that reveal a substantial remodelling of the active site through the movement of loop regions that create different catalytic functionalities at the same location. We have solved the three-dimensional structures of FBP aldolase/phosphatase from thermophilic Thermoproteus neutrophilus in a ligand-free state as well as in complex with the substrates DHAP and FBP and the product F6P to resolutions up to 1.3 A. In conjunction with mutagenesis data, this pinpoints the residues required for the two reaction steps and shows that the sequential binding of additional Mg(2+) cations reversibly facilitates the reaction. FBP aldolase/phosphatase is an ancestral gluconeogenic enzyme optimized for high ambient temperatures, and our work resolves how consecutive structural rearrangements reorganize the catalytic centre of the protein to carry out two canonical reactions in a very non-canonical type of bifunctionality.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Du, Juan -- Say, Rafael F -- Lu, Wei -- Fuchs, Georg -- Einsle, Oliver -- England -- Nature. 2011 Oct 9;478(7370):534-7. doi: 10.1038/nature10458.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lehrstuhl fur Biochemie, Institut fur organische Chemie und Biochemie, Albert-Ludwigs-Universitat Freiburg, Albertstrasse 21, 79104 Freiburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21983965" target="_blank"〉PubMed〈/a〉
    Keywords: Biocatalysis ; Catalytic Domain ; Crystallography, X-Ray ; Dihydroxyacetone Phosphate/metabolism ; Fructose-Bisphosphate Aldolase/*chemistry/*metabolism ; Fructosediphosphates/metabolism ; Fructosephosphates/metabolism ; Glyceraldehyde 3-Phosphate/metabolism ; Magnesium/metabolism ; Models, Molecular ; Phosphoric Monoester Hydrolases/*chemistry/*metabolism ; Protein Conformation ; Schiff Bases/chemistry ; Temperature ; Thermoproteus/*enzymology
    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: 2011-08-16
    Description: Nitrous oxide (N(2)O) is generated by natural and anthropogenic processes and has a critical role in environmental chemistry. It has an ozone-depleting potential similar to that of hydrochlorofluorocarbons as well as a global warming potential exceeding that of CO(2) 300-fold. In bacterial denitrification, N(2)O is reduced to N(2) by the copper-dependent nitrous oxide reductase (N(2)OR). This enzyme carries the mixed-valent Cu(A) centre and the unique, tetranuclear Cu(Z) site. Previous structural data were obtained with enzyme isolated in the presence of air that is catalytically inactive without prior reduction. Its Cu(Z) site was described as a [4Cu:S] centre, and the substrate-binding mode and reduction mechanism remained elusive. Here we report the structure of purple N(2)OR from Pseudomonas stutzeri, handled under the exclusion of dioxygen, and locate the substrate in N(2)O-pressurized crystals. The active Cu(Z) cluster contains two sulphur atoms, yielding a [4Cu:2S] stoichiometry; and N(2)O bound side-on at Cu(Z), in close proximity to Cu(A). With the substrate located between the two clusters, electrons are transferred directly from Cu(A) to N(2)O, which is activated by side-on binding in a specific binding pocket on the face of the [4Cu:2S] centre. These results reconcile a multitude of available biochemical data on N(2)OR that could not be explained by earlier structures, and outline a mechanistic pathway in which both metal centres and the intervening protein act in concert to achieve catalysis. This structure represents the first direct observation, to our knowledge, of N(2)O bound to its reductase, and sheds light on the functionality of metalloenzymes that activate inert small-molecule substrates. The principle of using distinct clusters for substrate activation and for reduction may be relevant for similar systems, in particular nitrogen-fixing nitrogenase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pomowski, Anja -- Zumft, Walter G -- Kroneck, Peter M H -- Einsle, Oliver -- England -- Nature. 2011 Aug 14;477(7363):234-7. doi: 10.1038/nature10332.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lehrstuhl fur Biochemie, Institut fur organische Chemie und Biochemie, Albert-Ludwigs-Universitat Freiburg, Albertstr. 21, 79104 Freiburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21841804" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Copper/chemistry/*metabolism ; Crystallography, X-Ray ; Electrons ; Hydrophobic and Hydrophilic Interactions ; Models, Molecular ; Nitrous Oxide/chemistry/*metabolism ; Oxidoreductases/*chemistry/*metabolism ; Protein Binding ; Protein Conformation ; Protein Multimerization ; Pseudomonas stutzeri/*enzymology ; Sulfur/chemistry/*metabolism
    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 ...
  • 7
    Publication Date: 2015-02-03
    Description: The six-electron reduction of sulfite to sulfide is the pivot point of the biogeochemical cycle of the element sulfur. The octahaem cytochrome c MccA (also known as SirA) catalyses this reaction for dissimilatory sulfite utilization by various bacteria. It is distinct from known sulfite reductases because it has a substantially higher catalytic activity and a relatively low reactivity towards nitrite. The mechanistic reasons for the increased efficiency of MccA remain to be elucidated. Here we show that anoxically purified MccA exhibited a 2- to 5.5-fold higher specific sulfite reductase activity than the enzyme isolated under oxic conditions. We determined the three-dimensional structure of MccA to 2.2 A resolution by single-wavelength anomalous dispersion. We find a homotrimer with an unprecedented fold and haem arrangement, as well as a haem bound to a CX15CH motif. The heterobimetallic active-site haem 2 has a Cu(I) ion juxtaposed to a haem c at a Fe-Cu distance of 4.4 A. While the combination of metals is reminiscent of respiratory haem-copper oxidases, the oxidation-labile Cu(I) centre of MccA did not seem to undergo a redox transition during catalysis. Intact MccA tightly bound SO2 at haem 2, a dehydration product of the substrate sulfite that was partially turned over due to photoreduction by X-ray irradiation, yielding the reaction intermediate SO. Our data show the biometal copper in a new context and function and provide a chemical rationale for the comparatively high catalytic activity of MccA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hermann, Bianca -- Kern, Melanie -- La Pietra, Luigi -- Simon, Jorg -- Einsle, Oliver -- England -- Nature. 2015 Apr 30;520(7549):706-9. doi: 10.1038/nature14109. Epub 2015 Feb 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lehrstuhl Biochemie, Institut fur Biochemie, Albert-Ludwigs-Universitat Freiburg, Albertstrasse 21, 79104 Freiburg, Germany. ; Microbial Energy Conversion &Biotechnology, Department of Biology, Technische Universitat Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany. ; 1] Lehrstuhl Biochemie, Institut fur Biochemie, Albert-Ludwigs-Universitat Freiburg, Albertstrasse 21, 79104 Freiburg, Germany [2] BIOSS Centre for Biological Signalling Studies, Schanzlestrasse 1, 79104 Freiburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25642962" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/*chemistry/isolation & purification/metabolism ; Biocatalysis ; Catalytic Domain ; Copper/*metabolism ; Crystallography, X-Ray ; Cysteine/analogs & derivatives/metabolism ; Heme/*analogs & derivatives/metabolism ; Models, Molecular ; Oxidation-Reduction ; Oxidoreductases Acting on Sulfur Group Donors/*chemistry/isolation & ; purification/metabolism ; Sulfites/metabolism ; Sulfur Dioxide/metabolism ; Wolinella/*enzymology
    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 ...
  • 8
    Publication Date: 2011-11-19
    Description: The identity of the interstitial light atom in the center of the FeMo cofactor of nitrogenase has been enigmatic since its discovery. Atomic-resolution x-ray diffraction data and an electron spin echo envelope modulation (ESEEM) analysis now provide direct evidence that the ligand is a carbon species.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3268367/" 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/PMC3268367/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Spatzal, Thomas -- Aksoyoglu, Muge -- Zhang, Limei -- Andrade, Susana L A -- Schleicher, Erik -- Weber, Stefan -- Rees, Douglas C -- Einsle, Oliver -- GM45162/GM/NIGMS NIH HHS/ -- R37 GM045162/GM/NIGMS NIH HHS/ -- R37 GM045162-22/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2011 Nov 18;334(6058):940. doi: 10.1126/science.1214025.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut fur Organische Chemie und Biochemie, Albert-Ludwigs-Universitat Freiburg, Freiburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22096190" target="_blank"〉PubMed〈/a〉
    Keywords: Azotobacter vinelandii/*chemistry ; Carbon/*chemistry ; Crystallography, X-Ray ; Electron Spin Resonance Spectroscopy ; Models, Molecular ; Molecular Structure ; Molybdoferredoxin/*chemistry ; Nitrogen/chemistry
    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 ...
  • 9
    Publication Date: 2012-10-22
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Publication Date: 2012-07-30
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    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...