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  • 1.
    Addario, Barbara
    et al.
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Huang, Shenghua
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Sauer, Uwe
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Backman, Lars
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Crystallization and preliminary X-ray analysis of the Entamoeba histolytica α-actinin-2 rod domain2011In: Acta Crystallographica. Section F: Structural Biology and Crystallization Communications, ISSN 1744-3091, E-ISSN 1744-3091, Vol. 67, no 10, p. 1214-1217Article in journal (Refereed)
    Abstract [en]

    -Actinins form antiparallel homodimers that are able to cross-link actin filaments. The protein contains three domains: an N-terminal actin-binding domain followed by a central rod domain and a calmodulin-like EF-hand domain at the C-terminus. Here, crystallization of the rod domain of Entamoeba histolytica -actinin-2 is reported; it crystallized in space group P212121, with unit-cell parameters a = 47.8, b = 79.1, c = 141.8 Å. A Matthews coefficient VM of 2.6 Å3 Da-1 suggests that there are two molecules and 52.5% solvent content in the asymmetric unit. A complete native data set extending to a d-spacing of 2.8 Å was collected on beamline I911-2 at MAX-lab, Sweden.

     

  • 2.
    Bäckström, Stefan
    et al.
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Huang, Shenghua
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Wolf-Watz, Magnus
    Chemistry.
    Xie, X Q
    Faculty of Medicine, Molecular Biology (Faculty of Medicine).
    Härd, Torleif
    Grundström, Thomas
    Faculty of Medicine, Molecular Biology (Faculty of Medicine).
    Sauer, Uwe
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Crystallization and preliminary studies of the DNA-binding runt domain of AML1.2001In: Acta Crystallogr D Biol Crystallogr, ISSN 0907-4449, Vol. 57, no Pt 2, p. 269-71Article in journal (Refereed)
    Abstract [en]

    The acute myeloid leukaemia 1 (AML1) protein belongs to the Runx family of transcription factors and is crucial for haematopoietic development. The genes encoding Runx1 and its associated factor CBF beta are the most frequent targets for chromosomal rearrangements in acute human leukaemias. In addition, point mutations of Runx1 in acute leukaemias and in the familial platelet disorder FPD/AML cluster within the evolutionary conserved runt domain that binds both DNA and CBF beta. Here, the crystallization of the Runx1 runt domain is reported. Crystals belong to space groups C2 and R32 and diffract to 1.7 and 2.0 A resolution, respectively.

  • 3.
    Eneqvist, Therese
    et al.
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Lundberg, Erik
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Karlsson, Anders
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Huang, Shenghua
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Santos, Ceci­lia R A
    Power, Deborah M
    Sauer-Eriksson, Elisabeth
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP).
    High resolution crystal structures of piscine transthyretin reveal different binding modes for triiodothyronine and thyroxine.2004In: Journal of Biological Chemistry, ISSN 0021-9258, E-ISSN 1083-351X, Vol. 279, no 25, p. 26411-6Article in journal (Refereed)
    Abstract [en]

    Transthyretin (TTR) is an extracellular transport protein involved in the distribution of thyroid hormones and vitamin A. So far, TTR has only been found in vertebrates, of which piscine TTR displays the lowest sequence identity with human TTR (47%). Human and piscine TTR bind both thyroid hormones 3,5,3'-triiodo-l-thyronine (T(3)) and 3,5,3',5'-tetraiodo-l-thyronine (thyroxine, T(4)). Human TTR has higher affinity for T(4) than T(3), whereas the reverse holds for piscine TTR. X-ray structures of Sparus aurata (sea bream) TTR have been determined as the apo-protein at 1.75 A resolution and bound to ligands T(3) and T(4), both at 1.9 A resolution. The apo structure is similar to human TTR with structural changes only at beta-strand D. This strand forms an extended loop conformation similar to the one in chicken TTR. The piscine TTR.T(4) complex shows the T(4)-binding site to be similar but not identical to human TTR, whereas the TTR.T(3) complex shows the I3' halogen situated at the site normally occupied by the hydroxyl group of T(4). The significantly wider entrance of the hormone-binding channel in sea bream TTR, in combination with its narrower cavity, provides a structural explanation for the different binding affinities of human and piscine TTR to T(3) and T(4).

  • 4.
    Hainzl, Tobias
    et al.
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Huang, Shenghua
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Meriläinen, Gitte
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Brännström, Kristoffer
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Sauer-Eriksson, A Elisabeth
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Structural basis of signal-sequence recognition by the signal recognition particle 2011In: Nature Structural & Molecular Biology, ISSN 1545-9993, E-ISSN 1545-9985, Vol. 18, no 3, p. 389-391Article in journal (Refereed)
    Abstract [en]

    The signal recognition particle (SRP) recognizes and binds the signal sequence of nascent proteins as they emerge from the ribosome. We present here the 3.0-Å structure of a signal sequence bound to the Methanococcus jannaschii SRP core. Structural comparison with the free SRP core shows that signal-sequence binding induces formation of the GM-linker helix and a 180° flip of the NG domain—structural changes that ensure a hierarchical succession of events during protein targeting.

  • 5.
    Hainzl, Tobias
    et al.
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Huang, Shenghua
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Sauer-Eriksson, Elisabeth
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Interaction of signal-recognition particle 54 GTPase domain and signal-recognition particle RNA in the free signal-recognition particle.2007In: Proc Natl Acad Sci U S A, ISSN 0027-8424, Vol. 104, no 38, p. 14911-6Article in journal (Refereed)
    Abstract [en]

    The signal-recognition particle (SRP) is a ubiquitous protein-RNA complex that targets proteins to cellular membranes for insertion or secretion. A key player in SRP-mediated protein targeting is the evolutionarily conserved core consisting of the SRP RNA and the multidomain protein SRP54. Communication between the SRP54 domains is critical for SRP function, where signal sequence binding at the M domain directs receptor binding at the GTPase domain (NG domain). These SRP activities are linked to domain rearrangements, for which the role of SRP RNA is not clear. In free SRP, a direct interaction of the GTPase domain with SRP RNA has been proposed but has never been structurally verified. In this study, we present the crystal structure at 2.5-A resolution of the SRP54-SRP19-SRP RNA complex of Methanococcus jannaschii SRP. The structure reveals an RNA-bound conformation of the SRP54 GTPase domain, in which the domain is spatially well separated from the signal peptide binding site. The association of both the N and G domains with SRP RNA in free SRP provides further structural evidence for the pivotal role of SRP RNA in the regulation of the SRP54 activity.

  • 6.
    Hainzl, Tobias
    et al.
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Huang, Shenghua
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Sauer-Eriksson, Elisabeth
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Structural insights into SRP RNA: an induced fit mechanism for SRP assembly.2005In: RNA, ISSN 1355-8382, Vol. 11, no 7, p. 1043-50Article in journal (Refereed)
    Abstract [en]

    Proper assembly of large protein-RNA complexes requires sequential binding of the proteins to the RNA. The signal recognition particle (SRP) is a multiprotein-RNA complex responsible for the cotranslational targeting of proteins to biological membranes. Here we describe the crystal structure at 2.6-A resolution of the S-domain of SRP RNA from the archeon Methanococcus jannaschii. Comparison of this structure with the SRP19-bound form reveals the nature of the SRP19-induced conformational changes, which promote subsequent SRP54 attachment. These structural changes are initiated at the SRP19 binding site and transmitted through helix 6 to looped-out adenosines, which form tertiary RNA interaction with helix 8. Displacement of these adenosines enforces a conformational change of the asymmetric loop structure in helix 8. In free RNA, the three unpaired bases A195, C196, and C197 are directed toward the helical axis, whereas upon SRP19 binding the loop backbone inverts and the bases are splayed out in a conformation that resembles the SRP54-bound form. Nucleotides adjacent to the bulged nucleotides seem to be particularly important in the regulation of this loop transition. Binding of SRP19 to 7S RNA reveals an elegant mechanism of how protein-induced changes are directed through an RNA molecule and may relate to those regulating the assembly of other RNPs.

  • 7.
    Hainzl, Tobias
    et al.
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Huang, Shenghua
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Sauer-Eriksson, Elisabeth
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Structure of the SRP19 RNA complex and implications for signal recognition particle assembly.2002In: Nature, ISSN 0028-0836, Vol. 417, no 6890, p. 767-71Article in journal (Refereed)
    Abstract [en]

    The signal recognition particle (SRP) is a phylogenetically conserved ribonucleoprotein. It associates with ribosomes to mediate co-translational targeting of membrane and secretory proteins to biological membranes. In mammalian cells, the SRP consists of a 7S RNA and six protein components. The S domain of SRP comprises the 7S.S part of RNA bound to SRP19, SRP54 and the SRP68/72 heterodimer; SRP54 has the main role in recognizing signal sequences of nascent polypeptide chains and docking SRP to its receptor. During assembly of the SRP, binding of SRP19 precedes and promotes the association of SRP54 (refs 4, 5). Here we report the crystal structure at 2.3 A resolution of the complex formed between 7S.S RNA and SRP19 in the archaeon Methanococcus jannaschii. SRP19 bridges the tips of helices 6 and 8 of 7S.S RNA by forming an extensive network of direct protein RNA interactions. Helices 6 and 8 pack side by side; tertiary RNA interactions, which also involve the strictly conserved tetraloop bases, stabilize helix 8 in a conformation competent for SRP54 binding. The structure explains the role of SRP19 and provides a molecular framework for SRP54 binding and SRP assembly in Eukarya and Archaea.

  • 8.
    Huang, Shenghua
    et al.
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Hainzl, Tobias
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Grundström, Christin
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Forsman, Cecilia
    Orphan Biovitrum AB, Umeå, Sweden.
    Samuelsson, Göran
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Sauer-Eriksson, A Elisabeth
    Umeå University, Faculty of Science and Technology, Department of Chemistry. Umeå University, Faculty of Medicine, Umeå Centre for Microbial Research (UCMR).
    Structural studies of β-Carbonic Anhydrase from the Green Alga Coccomyxa: Inhibitor complexes with Anions and Acetazolamide2011In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 6, no 12, p. e28458-Article in journal (Refereed)
    Abstract [en]

    The β-class carbonic anhydrases (β-CAs) are widely distributed among lower eukaryotes, prokaryotes, archaea, and plants. Like all CAs, the β-enzymes catalyze an important physiological reaction, namely the interconversion between carbon dioxide and bicarbonate. In plants the enzyme plays an important role in carbon fixation and metabolism. To further explore the structure-function relationship of β-CA, we have determined the crystal structures of the photoautotroph unicellular green alga Coccomyxa β-CA in complex with five different inhibitors: acetazolamide, thiocyanate, azide, iodide, and phosphate ions. The tetrameric Coccomyxa β-CA structure is similar to other β-CAs but it has a 15 amino acid extension in the C-terminal end, which stabilizes the tetramer by strengthening the interface. Four of the five inhibitors bind in a manner similar to what is found in complexes with α-type CAs. Iodide ions, however, make contact to the zinc ion via a zinc-bound water molecule or hydroxide ion - a type of binding mode not previously observed in any CA. Binding of inhibitors to Coccomyxa β-CA is mediated by side-chain movements of the conserved residue Tyr-88, extending the width of the active site cavity with 1.5-1.8 Å. Structural analysis and comparisons with other α- and β-class members suggest a catalytic mechanism in which the movements of Tyr-88 are important for the CO(2)-HCO(3) (-) interconversion, whereas a structurally conserved water molecule that bridges residues Tyr-88 and Gln-38, seems important for proton transfer, linking water molecules from the zinc-bound water to His-92 and buffer molecules.

  • 9.
    Huang, Shenghua
    et al.
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Sjöblom, Björn
    Chemistry.
    Sauer-Eriksson, Elisabeth
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Jonsson, Bengt-Harald
    Chemistry.
    Organization of an efficient carbonic anhydrase: implications for the mechanism based on structure-function studies of a T199P/C206S mutant.2002In: Biochemistry, ISSN 0006-2960, Vol. 41, no 24, p. 7628-35Article in journal (Refereed)
    Abstract [en]

    Substitution of Pro for Thr199 in the active site of human carbonic anhydrase II (HCA II)(1) reduces its catalytic efficiency about 3000-fold. X-ray crystallographic structures of the T199P/C206S variant have been determined in complex with the substrate bicarbonate and with the inhibitors thiocyanate and beta-mercaptoethanol. The latter molecule is normally not an inhibitor of wild-type HCA II. All three ligands display novel binding interactions to the T199P/C206S mutant. The beta-mercaptoethanol molecule binds in the active site area with its sulfur atom tetrahedrally coordinated to the zinc ion. Thiocyanate binds tetrahedrally coordinated to the zinc ion in T199P/C206S, in contrast to its pentacoordinated binding to the zinc ion in wild-type HCA II. Bicarbonate binds to the mutant with two of its oxygens at the positions of the zinc water (Wat263) and Wat318 in wild-type HCA II. The environment of this area is more hydrophilic than the normal bicarbonate-binding site of HCA II situated in the hydrophobic part of the cavity normally occupied by the so-called deep water (Wat338). The observation of a new binding site for bicarbonate has implications for understanding the mechanism by which the main-chain amino group of Thr199 acquired an important role for orientation of the substrate during the evolution of the enzyme.

  • 10.
    Huang, Shenghua
    et al.
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Xue, Y
    Sauer-Eriksson, Elisabeth
    Umeå University, Faculty of Science and Technology, Umeå Centre for Molecular Pathogenesis (UCMP) (Faculty of Science and Technology).
    Chirica, L
    Lindskog, Sven
    Chemistry.
    Jonsson, Bengt-Harald
    Chemistry.
    Crystal structure of carbonic anhydrase from Neisseria gonorrhoeae and its complex with the inhibitor acetazolamide.1998In: J Mol Biol, ISSN 0022-2836, Vol. 283, no 1, p. 301-10Article in journal (Refereed)
    Abstract [en]

    The crystal structure of carbonic anhydrase from Neisseria gonorrhoeae has been solved to a resolution of 1.78 A by molecular replacement using human carbonic anhydrase II as a template. After refinement the R factor was 17.8% (Rfree=23.2%). There are two molecules per asymmetric unit (space group P21), but they have essentially identical structures. The fold of the N. gonorrhoeae enzyme is very similar to that of human isozyme II; 192 residues, 74 of which are identical in the two enzymes, have equivalent positions in the three-dimensional structures. This corresponds to 85% of the entire polypeptide chain of the bacterial enzyme. The only two cysteine residues in the bacterial enzyme, which has a periplasmic location in the cell, are connected by a disulfide bond. Most of the secondary structure elements present in human isozyme II are retained in N. gonorrhoeae carbonic anhydrase, but there are also differences, particularly in the few helical regions. Long deletions in the bacterial enzyme relative to human isozyme II have resulted in a considerable shortening of three surface loops. One of these deletions, corresponding to residues 128 to 139 in the human enzyme, leads to a widening of the entrance to the hydrophobic part of the active site cavity. Practically all the amino acid residues in the active site of human isozyme II are conserved in the N. gonorrhoeae enzyme and have similar structural positions. However, the imidazole ring of a histidine residue, which has been shown to function as a proton shuttle in the catalytic mechanism of the human enzyme, interacts with an extraneous entity, which has tentatively been identified as a 2-mercaptoethanol molecule from the crystallization medium. When this entity is removed by soaking the crystal in a different medium, the side-chain of His66 becomes quite mobile. The structure of a complex with the sulfonamide inhibitor, acetazolamide, has also been determined. Its position in the active site is very similar to that observed in human carbonic anhydrase II.

  • 11.
    Wikström Hultdin, Ulrika
    et al.
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Lindberg, Stina
    Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).
    Grundström, Christin
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Allgardsson, Anders
    Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine). Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Huang, Shenghua
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Stier, Günter
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Öhman, Anders
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Uhlin, Bernt Eric
    Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).
    Sauer-Eriksson, Elisabeth
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Purification, crystallization and preliminary data analysis of FocB, a transcription factor regulating fimbrial adhesin expression in uropathogenic Escherichia coli2010In: Acta Crystallographica. Section F: Structural Biology and Crystallization Communications, ISSN 1744-3091, E-ISSN 1744-3091, Vol. 66, no Pt 3, p. 337-341Article in journal (Refereed)
    Abstract [en]

    The transcription factor FocB belongs to a family of regulators encoded by several different fimbriae gene clusters in uropathogenic Escherichia coli. Recent findings suggest that FocB-family proteins may form different protein-protein complexes and that they may exert both positive and negative effects on the transcription of fimbriae genes. However, little is known about the actual role and mode of action when these proteins interact with the fimbriae operons. The 109-amino-acid FocB transcription factor from the foc gene cluster in E. coli strain J96 has been cloned, expressed and purified. The His6-tagged fusion protein was captured by Ni2+-affinity chromatography, cleaved with tobacco etch virus protease and purified by gel filtration. The purified protein is oligomeric, most likely in the form of dimers. NMR analysis guided the crystallization attempts by showing that probable conformational exchange or oligomerization is reduced at temperatures above 293 K and that removal of the highly flexible His6 tag is advantageous. The protein was crystallized using the hanging-drop vapour-diffusion method at 295 K. A native data set to 2.0 Å resolution was collected at 100 K using synchrotron radiation.

  • 12.
    Wikström Hultdin, Ulrika
    et al.
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Lindberg, Stina
    Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).
    Grundström, Christin
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Huang, Shenghua
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Uhlin, Bernt Eric
    Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).
    Sauer-Eriksson, Elisabeth
    Umeå University, Faculty of Science and Technology, Department of Chemistry.
    Structure of FocB: a member of a family of transcription factors regulating fimbrial adhesin expression in uropathogenic Escherichia coli2010In: The FEBS Journal, ISSN 1742-464X, E-ISSN 1742-4658, Vol. 277, no 16, p. 3368-3381Article in journal (Refereed)
    Abstract [en]

    In uropathogenic Escherichia coli, UPEC, different types of fimbriae are expressed in order to mediate interactions with host tissue. FocB belongs to the PapB family of transcription factors involved in the regulation of fimbriae gene clusters. Recent findings suggest that members from this family of proteins may form different protein-protein complexes and that they may exert both positive and negative effects on transcription of fimbriae genes. To elucidate the detailed function of FocB, we have determined its crystal structure at 1.4 Å resolution. FocB is an all alpha helical structure with a helix-turn-helix (HTH) motif. Interestingly, conserved residues important for DNA-binding are not located in the recognition helix of the HTH-motif, but in the preceding helix. Results from protein-DNA binding studies indicated that FocB interacts with minor groove of its cognate DNA, which also points to a DNA-interaction unusual for this motif. Packing interactions in the crystals gave two plausible dimerization interfaces. Conserved residues known to be important for protein oligomerization are present at both interfaces, suggesting that both sites play a role in a functional FocB protein.

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