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NTF2 protein

Pascal Dubessay, Christian Larroche, Pierre Fontanille
The alpha-pinene oxide lyase (Prα-POL) from Pseudomonas rhodesiae CIP107491 belongs to catabolic alpha-pinene degradation pathway. In this study, the gene encoding Prα-POL has been identified using mapping approach combined to inverse PCR (iPCR) strategy. The Prα-POL gene included a 609-bp open reading frame encoding 202 amino acids and giving rise to a 23.7 kDa protein, with a theoretical isoelectric point (pI) of 5.23. The amino acids sequence analysis showed homologies with those of proteins with unknown function from GammaProteobacteria group...
December 28, 2017: Applied Biochemistry and Biotechnology
Qiong Zhang, Bing Wang, Jinping Wei, Xiaojie Wang, Qingmei Han, Zhensheng Kang
Nuclear Transport Factor 2 (NTF2) functions as a critical regulator in balancing the GTP-and GDP-bound forms of Ran, a class of evolutionarily conserved small GTP-binding protein. During the incompatible interaction between wheat-Puccinia striiformis f. sp. tritici (Pst), a cDNA fragment encoding a putative wheat NTF2 gene was found to be significantly induced, suggesting a potential role in wheat resistance to Pst. In this work, the full length of TaNTF2 was obtained, with three copies located on 7A, 7B and 7D chromosomes, respectively...
December 16, 2017: Plant Physiology and Biochemistry: PPB
Zhiqiang Duan, Jiafu Zhao, Houqiang Xu, Haixu Xu, Xinqin Ji, Xiang Chen, Jianming Xiong
Numerous studies have shown that nuclear localization of BLM protein, a member of the RecQ helicases, mediated by nuclear localization signal (NLS) is critical for DNA recombination, replication and transcription, but the mechanism by which BLM protein is imported into the nucleus remains unknown. In this study, the nuclear import pathway for BLM was investigated. We found that nuclear import of BLM was inhibited by two dominant-negative mutants of importin β1 and NTF2/E42K, which lacks the ability to bind Ran and RanGDP, respectively, but was not inhibited by the Ran/Q69L, which is deficient in GTP hydrolysis...
October 7, 2017: Archives of Biochemistry and Biophysics
Alexandra Aubé, Shirley Campbell, Andreea R Schmitzer, Audrey Claing, Jean-François Masson
We synthesized novel ultra-low fouling ionic liquids and demonstrated their use with surface plasmon resonance (SPR) sensing for the analysis of HER2 in breast cancer cell lysates. Whilst biomarkers are commonly detected in serum, this remains challenging for cancer diagnosis due to their low concentrations in circulation and in some cases, there is a poor correlation between serum and tissue concentrations. Therefore, a cell lysate constitutes an interesting biosample for cancer diagnosis and typing, which has been largely unexploited for chemical biosensing of cancer biomarkers...
May 31, 2017: Analyst
Sigal Lechno-Yossef, Matthew R Melnicki, Han Bao, Beronda L Montgomery, Cheryl A Kerfeld
The orange carotenoid protein (OCP) governs photoprotection in the majority of cyanobacteria. It is structurally and functionally modular, comprised of a C-terminal regulatory domain (CTD), an N-terminal effector domain (NTD) and a ketocarotenoid; the chromophore spans the two domains in the ground state and translocates fully into the NTD upon illumination. Using both the canonical OCP1 from Fremyella diplosiphon and the presumably more primitive OCP2 paralog from the same organism, we show that an NTD-CTD heterodimer forms when the domains are expressed as separate polypeptides...
August 2017: Plant Journal: for Cell and Molecular Biology
Meichen Liu, Qun Wang, Hongmei Xie, Shichao Liu, Siming Wang, Hui Zhang, Yu Zhao
Reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR) analysis relies on normalization against a consistently expressed reference gene. However, it has been reported that reference gene expression levels often vary markedly between samples as they are usually selected based solely on convention. The advent of RNA sequencing technology offers the opportunity to select reference genes with the least variability in steady‑state transcript levels. To identify the most consistently stable genes, which are a prerequisite for obtaining reliable gene expression data, the present study analyzed transcriptomes from six Panax ginseng transcriptome data sets, representing six growth stages, and selected 21 candidate reference genes for screening using RT‑qPCR...
June 2017: Molecular Medicine Reports
Sarah Kube, Nils Hersch, Elena Naumovska, Thomas Gensch, Johnny Hendriks, Arne Franzen, Lisa Landvogt, Jan-Peter Siebrasse, Ulrich Kubitscheck, Bernd Hoffmann, Rudolf Merkel, Agnes Csiszár
Direct delivery of proteins and peptides into living mammalian cells has been accomplished using phospholipid liposomes as carrier particles. Such liposomes are usually taken up via endocytosis where the main part of their cargo is degraded in lysosomes before reaching its destination. Here, fusogenic liposomes, a newly developed molecular carrier system, were used for protein delivery. When such liposomes were loaded with water-soluble proteins and brought into contact with mammalian cells, the liposomal membrane efficiently fused with the cellular plasma membrane delivering the liposomal content to the cytoplasm without degradation...
January 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Susanna Krapp, Eva Greiner, Bushra Amin, Uwe Sonnewald, Björn Krenz
Stress granules (SGs) are structures within cells that regulate gene expression during stress response, e.g. viral infection. In mammalian cells assembly of SGs is dependent on the Ras-GAP SH3-domain-binding protein (G3BP). The C-terminal domain of the viral nonstructural protein 3 (nsP3) of Semliki Forest virus (SFV) forms a complex with mammalian G3BP and sequesters it into viral RNA replication complexes in a manner that inhibits the formation of SGs. The binding domain of nsP3 to HsG3BP was mapped to two tandem 'FGDF' repeat motifs close to the C-terminus of the viral proteins...
January 2, 2017: Virus Research
Tingting Huang, Chin-Yuan Chang, Jeremy R Lohman, Jeffrey D Rudolf, Youngchang Kim, Changsoo Chang, Dong Yang, Ming Ma, Xiaohui Yan, Ivana Crnovcic, Lance Bigelow, Shonda Clancy, Craig A Bingman, Ragothaman M Yennamalli, Gyorgy Babnigg, Andrzej Joachimiak, George N Phillips, Ben Shen
Comparative analysis of the enediyne biosynthetic gene clusters revealed sets of conserved genes serving as outstanding candidates for the enediyne core. Here we report the crystal structures of SgcJ and its homologue NCS-Orf16, together with gene inactivation and site-directed mutagenesis studies, to gain insight into enediyne core biosynthesis. Gene inactivation in vivo establishes that SgcJ is required for C-1027 production in Streptomyces globisporus. SgcJ and NCS-Orf16 share a common structure with the nuclear transport factor 2-like superfamily of proteins, featuring a putative substrate binding or catalytic active site...
October 2016: Journal of Antibiotics
Tim Schulte, Lifeng Liu, Marc D Panas, Bastian Thaa, Nicole Dickson, Benjamin Götte, Adnane Achour, Gerald M McInerney
Recent findings have highlighted the role of the Old World alphavirus non-structural protein 3 (nsP3) as a host defence modulator that functions by disrupting stress granules, subcellular phase-dense RNA/protein structures formed upon environmental stress. This disruption mechanism was largely explained through nsP3-mediated recruitment of the host G3BP protein via two tandem FGDF motifs. Here, we present the 1.9 Å resolution crystal structure of the NTF2-like domain of G3BP-1 in complex with a 25-residue peptide derived from Semliki Forest virus nsP3 (nsP3-25)...
July 2016: Open Biology
Lidija D Vuković, Predrag Jevtić, Zhaojie Zhang, Bradley A Stohr, Daniel L Levy
Altered nuclear size is associated with many cancers, and determining whether cancer-associated changes in nuclear size contribute to carcinogenesis necessitates an understanding of mechanisms of nuclear size regulation. Although nuclear import rates generally positively correlate with nuclear size, NTF2 levels negatively affect nuclear size, despite the role of NTF2 (also known as NUTF2) in nuclear recycling of the import factor Ran. We show that binding of Ran to NTF2 is required for NTF2 to inhibit nuclear expansion and import of large cargo molecules in Xenopus laevis egg and embryo extracts, consistent with our observation that NTF2 reduces the diameter of the nuclear pore complex (NPC) in a Ran-binding-dependent manner...
March 15, 2016: Journal of Cell Science
Jiyoung Han, Kanghwa Kim, Songmi Lee
To screen molecular chaperones similar to small heat shock proteins (sHsps), but without α-crystalline domain, heat-stable proteins from Schizosaccharomyces pombe were analyzed by 2-dimensional electrophoresis and matrix assisted laser desorption/ionization time-of-flight mass spectrometry. Sixteen proteins were identified, and four recombinant proteins, including cofilin, NTF2, pyridoxin biosynthesis protein (Snz1) and Wos2 that has an α-crystalline domain, were purified. Among these proteins, only Snz1 showed the anti-aggregation activity against thermal denaturation of citrate synthase...
September 2015: Mycobiology
Mary Christie, Chiung-Wen Chang, Gergely Róna, Kate M Smith, Alastair G Stewart, Agnes A S Takeda, Marcos R M Fontes, Murray Stewart, Beáta G Vértessy, Jade K Forwood, Bostjan Kobe
Proteins are translated in the cytoplasm, but many need to access the nucleus to perform their functions. Understanding how these nuclear proteins are transported through the nuclear envelope and how the import processes are regulated is therefore an important aspect of understanding cell function. Structural biology has played a key role in understanding the molecular events during the transport processes and their regulation, including the recognition of nuclear targeting signals by the corresponding receptors...
May 22, 2016: Journal of Molecular Biology
Philipp Knyphausen, Nora Kuhlmann, Susanne de Boor, Michael Lammers
The small GTP-binding protein Ran is involved in the regulation of essential cellular processes in interphase but also in mitotic cells: Ran controls the nucleocytoplasmic transport of proteins and RNA, it regulates mitotic spindle formation and nuclear envelope assembly. Deregulations in Ran dependent processes were implicated in the development of severe diseases such as cancer and neurodegenerative disorders. To understand how Ran-function is regulated is therefore of highest importance. Recently, several lysine-acetylation sites in Ran were identified by quantitative mass-spectrometry, some being located in highly important regions such as the P-loop, switch I, switch II and the G5/SAK motif...
October 2, 2015: Small GTPases
Aydin Beseli, Roslyn Noar, Margaret E Daub
The photoactivated toxin, cercosporin, produced by Cercospora species, plays an important role in pathogenesis of this fungus to host plants. Cercosporin has almost universal toxicity to cells due to its production of reactive oxygen species including singlet oxygen. For that reason, Cercospora species, which are highly resistant to their own toxin, are good candidates to identify genes for resistance to cercosporin and to the reactive oxygen species it produces. In previous research, the zinc cluster transcription factor CRG1 (cercosporin resistance gene 1) was found to be crucial for Cercospora species' resistance against cercosporin, and subtractive hybridization analysis identified 185 genes differentially expressed between Cercospora nicotianae wild type (wt) and a crg1 mutant...
2015: PloS One
Meena Bisht, Awanish Kumar, Pannuru Venkatesu
Ionic liquids (ILs) have found various applications in the field of biotechnology that involves protein extraction from the aqueous phase. However, the stability of biomolecules in ILs is still unpredictable. Therefore, this work aims to understand the effect of ammonium-based ILs with a fixed (trifluoromethylsulfonyl)imide [NTf2](-) anion and variable ammonium cations such as butyltrimethylammonium (IL-1), ethyldimethylpropylammonium (IL-2), diethylmethyl(2-methoxyethyl)ammonium (IL-3) and methyl-trioctylammonium (IL-4) on the stability of lysozyme...
November 2015: International Journal of Biological Macromolecules
Ole Kristensen
The crystal structure of the NTF2-like domain of the human Ras GTPase SH3 Binding Protein (G3BP), isoform 2, was determined at a resolution of 2.75 Å in complex with a peptide containing a FGDF sequence motif. The overall structure of the protein is highly similar to the homodimeric N-terminal domains of the G3BP1 and Rasputin proteins. Recently, a subset of G3BP interacting proteins was recognized to share a common sequence motif, FGDF. The most studied binding partners, USP10 and viral nsP3, interfere with essential G3BP functions related to assembly of cellular stress granules...
November 6, 2015: Biochemical and Biophysical Research Communications
Jelke J Fros, Corinne Geertsema, Karima Zouache, Jim Baggen, Natalia Domeradzka, Daniël M van Leeuwen, Jacky Flipse, Just M Vlak, Anna-Bella Failloux, Gorben P Pijlman
BACKGROUND: Chikungunya virus (CHIKV) is an arthritogenic alphavirus (family Togaviridae), transmitted by Aedes species mosquitoes. CHIKV re-emerged in 2004 with multiple outbreaks worldwide and recently reached the Americas where it has infected over a million individuals in a rapidly expanding epidemic. While alphavirus replication is well understood in general, the specific function (s) of non-structural protein nsP3 remain elusive. CHIKV nsP3 modulates the mammalian stress response by preventing stress granule formation through sequestration of G3BP...
2015: Parasites & Vectors
Lucas C Reineke, Nancy Kedersha, Martijn A Langereis, Frank J M van Kuppeveld, Richard E Lloyd
UNLABELLED: Stress granules (SGs) are dynamic cytoplasmic repositories containing translationally silenced mRNAs that assemble upon cellular stress. We recently reported that the SG nucleating protein G3BP1 promotes antiviral activity and is essential in double-stranded RNA-dependent protein kinase (PKR) recruitment to stress granules, thereby driving phosphorylation of the α subunit of eukaryotic initiation factor 2 (eIF2α). Here, we delineate the mechanism for SG-dependent PKR activation...
2015: MBio
Raphael S Wagner, Larisa E Kapinos, Neil J Marshall, Murray Stewart, Roderick Y H Lim
The transport channel of nuclear pore complexes (NPCs) contains a high density of intrinsically disordered proteins that are rich in phenylalanine-glycine (FG)-repeat motifs (FG Nups). The FG Nups interact promiscuously with various nuclear transport receptors (NTRs), such as karyopherins (Kaps), that mediate the trafficking of nucleocytoplasmic cargoes while also generating a selectively permeable barrier against other macromolecules. Although the binding of NTRs to FG Nups increases molecular crowding in the NPC transport channel, it is unclear how this impacts FG Nup barrier function or the movement of other molecules, such as the Ran importer NTF2...
February 17, 2015: Biophysical Journal
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