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   1                                              RRE recognition triggers a crucial coil-to-helix transit
  
     3 The precise secondary structure of the HIV-1 RRE has been controversial, since studies have reported 
  
  
  
     7 ation, the secondary structures of the HIV-2 RRE and two RNA folding precursors have been identified 
     8 nalysis collectively suggests that the HIV-2 RRE undergoes two conformational transitions before assu
  
  
    11 cence titration assay revealed high-affinity RRE RNA binding by all 22 metal-chelate-Rev species, wit
    12 c compounds, as a specific and high-affinity RRE-IIB binder which inhibits the interaction of the Rev
    13 ssess whether BALF5 might be activated by an RRE-dependent mechanism, an Rta mutant (Rta K156A), defi
  
    15 stem by an additional base pair, creating an RRE that was more responsive to lower concentrations of 
  
    17 t (Rta K156A), deficient for DNA binding and RRE activation but competent for Zp/Rp activation, was u
  
  
  
  
  
    23  able to promote replication of the Rev- and RRE-defective HIV-1 in both human lymphoid cell lines an
    24 (nucleocapsid) locally melts the TAR RNA and RRE-IIB RNA hairpins, whereas arginine-rich motif protei
  
  
  
  
    29   In SSKH cells, Rev failed to activate both RRE-mediated reporter gene [chloramphenicol acetyltransf
  
  
    32  also reflected at the levels of cytoplasmic RRE-chloramphenicol acetyltransferase mRNAs, indicating 
  
    34 t the first crystal structure of a Rev dimer-RRE complex, revealing a dramatic rearrangement of the R
    35 nter in a protein and suggest that dinuclear RRE species, not mononuclear DNICs, may be the primary i
  
    37 transactivation of reporters containing each RRE showed that their promoter strengths in a transient-
    38 lectrophoretic mobility shift assays of each RRE demonstrated that the highly purified Rdbd protein d
    39 ngth Ets-1 binds equivalently to BTE and EBS-RRE probes, while recombinant GABPalpha/beta preferentia
  
    41 osslinking experiments with radiolabeled EBS-RRE and BTE oligonucleotides showed that these probes sp
    42 ning GABP, we were able to show that the EBS-RRE preferentially binds Ets-1, while the BTE binds both
  
    44 Ss contained in the RRE and BTE, we used EBS-RRE and BTE oligonucleotides in electrophoretic mobility
    45 he level of relative replication efficiency (RRE) depends on the number and type of transcription fac
  
  
    48 of virion (Rev) to the Rev response element (RRE) and subsequent oligomerization in a cooperative man
  
  
  
    52 assembly of Rev on the Rev response element (RRE) is essential for the nuclear export of unspliced an
  
    54  multiple sites in the Rev response element (RRE) of viral mRNA transcripts in nuclei of host cells, 
    55 NA containing either a Rev response element (RRE) or a Mason-Pfizer monkey virus (MPMV) constitutive 
    56 V-1 protein Rev on the Rev Response Element (RRE) regulates nuclear export of genomic viral RNA and p
    57  been proposed for the Rev-response element (RRE) responsible for viral mRNA export, how it recruits 
    58 oop II region of HIV-1 Rev response element (RRE) RNA enhanced binding of HIV-1 Rev protein to the RR
    59 n homooligomer and the Rev response element (RRE) RNA to mediate nuclear export of unspliced viral mR
  
    61 al RNAs containing the Rev Response Element (RRE) through the Crm1 nuclear export pathway to the cyto
    62 al Rev protein and the Rev response element (RRE), a structured element located in the Env region of 
    63 bunits assemble on the Rev Response Element (RRE), a structured region present in these RNAs, and dir
    64  within viral RNA, the Rev response element (RRE), and escorts RRE-containing RNAs from the nucleus. 
    65 ral mRNAs encoding the Rev response element (RRE), thereby facilitating viral late gene expression.  
    66 virus (HIV) mRNAs, the Rev response element (RRE), to recruit the cellular nuclear export receptor Cr
    67 transcripts harbor the Rev Response Element (RRE), which orchestrates the interaction with the Rev AR
    68  or, unexpectedly, the Rev response element (RRE), which regulates the nuclear export of gRNAs and ot
    69 P to mediate export of Rev response element (RRE)-containing human immunodeficiency virus (HIV) RNA, 
  
    71 ies with, HIV-1 Rev in Rev-response element (RRE)-mediated gene expression and virus replication.    
  
  
  
  
    76 hich we have named the Ras response element (RRE); whereas the response of multiple growth factors (F
  
  
    79  is dependent on the Ras responsive element (RRE) binding protein (RREB1), which negatively regulates
    80 interactions with an RTA-responsive element (RRE) could complement the loss of one RBPjkappa binding 
  
    82 interaction with the Rev responsive element (RRE) of HIV-1 mRNA has been studied by directly observin
    83  viral elements, the Rev-responsive element (RRE) of the human immunodeficiency virus (HIV), and the 
  
    85 ions between the HIV Rev-responsive element (RRE) RNA and the HIV regulatory protein Rev, are crucial
  
    87 munodeficiency virus Rev-responsive element (RRE) RNA by the Rev protein is an essential step in the 
    88 ind and activate the Rev-responsive element (RRE) RNA or heterologous MS2 phage operator RNA, we anal
  
    90 otein that binds the Rev responsive element (RRE) within the env gene of the HIV-1 RNA genome, activa
    91 ously reported 16-bp RTA-responsive element (RRE), and the same mutation also both reduced RTA-mediat
    92  As opposed to HIV's Rev-responsive element (RRE), the Rex-responsive element (RxRE) is present in al
    93 SNV) facilitates Rev/Rev-responsive element (RRE)-independent expression of intron-containing human i
  
    95 uclear export element (Rev-response element [RRE]) used by HIV-1 and EIAV with the hepatitis B virus 
  
  
  
  
   100 e RNA motifs known as Rev response elements (RREs) is required for transport of unspliced and partial
  
   102  a special focus on Ras responsive elements (RREs), the MAP kinases (Erks, p38 and JNK) and Ca2+-spec
   103 sest relatives of Sam68, marginally enhanced RRE-mediated transactivation, while QK isoforms that are
  
  
   106 l model of a Rev dimer bound to an essential RRE hairpin and to visualize the complete Rev-RRE RNP, d
   107 s)(2)(NO)(4)], having a Roussin's red ester (RRE) formula, and that mononuclear DNICs account for onl
   108 structurally related to Roussin's Red Ester (RRE, [Fe2 (NO)4 (Cys)2 ]) and Roussin's Black Salt (RBS,
   109 eities in tempo (relative rate of evolution, RRE) and mode (selection pressure, Ka/Ks) in six organis
   110 M10 resistance, which prompted us to examine RRE structure using a novel chemical probing strategy.  
  
   112 uction correlated with the failure to export RRE-containing CAT mRNA and unspliced viral mRNAs to the
  
  
  
  
   117  mutants that preserved the Rev response for RRE RNA localized to the nuclei; those with poor or no R
  
  
  
   121 constants and chemical reactivity toward HIV RRE RNA have been determined and evaluated in terms of r
  
   123 d nuclear residence times and differences in RRE binding affinity may have compromised their activati
  
   125 immunodeficiency virus type 1 (HIV-1) Rev in RRE (Rev response element)-mediated gene expression and 
  
  
   128 d the functional contributions of individual RRE domains and now report that several domains contribu
   129  analysis showed strong enrichment for known RREs but little or no enrichment for Rp or Zp, suggestin
  
  
  
  
  
  
   136  loops from HIV-1 Rev Response Element mRNA (RRE RNA) and ribosomal 16S A-site RNA (16S RNA) by metal
   137 footprinting results and studies with mutant RRE sequences indicate that the internal loop of RRE is 
   138 ing within the internal purine-rich bulge of RRE-IIB in a manner analogous to what has been observed 
  
   140  viral Rev protein induces nuclear export of RRE-containing RNAs, as required for virus replication. 
  
  
   143 sequences indicate that the internal loop of RRE is required for specific binding of DB340 as with th
  
   145 specific hydrogen bonding for recognition of RRE, shape recognition, through contact with the sugar-p
  
  
   148 e the effects of these KH family proteins on RRE- and CTE (constitutive transport element of type-D r
   149 t two classes of proflavine binding sites on RRE-IIB: a high-affinity site that competes with the Rev
   150 s used to directly assess Rev "loading" onto RRE and its variants, indicating that this is unaffected
  
  
   153 turally intronless genes, but not the CTE or RRE from intron-containing genes, significantly enhanced
  
  
  
   157 ctly to the polyadenylated nuclear RNA (PAN) RRE motif, failed to bind to the RAP RRE and interfered 
  
  
  
   161 ory efficacy of proflavin on the Rev peptide-RRE binding, even in the presence of substantial levels 
   162 nsor for sensitively quantifying Rev peptide-RRE interaction and characterizing the potential inhibit
  
   164 responsive element of the PAN promoter (pPAN RRE) was previously identified, and our data suggested d
  
   166 , an extensive mutagenesis study on the pPAN RRE was carried out by using EMSAs and reporter assays. 
   167 ociation constant (K(d)) of Rdbd on the pPAN RRE was determined to be approximately 8 x 10(-9) M, sug
  
  
   170  in the NOESY spectrum of the 2:1 proflavine.RRE-IIB complex indicate that the two proflavine molecul
   171 ndicate that formation of the 2:1 proflavine.RRE-IIB complex stabilizes base pairing and stacking wit
   172 ng interaction occurs with a 2:1 (proflavine:RRE-IIB) stoichiometry, and NOEs observed in the NOESY s
   173 A (PAN) RRE motif, failed to bind to the RAP RRE and interfered with RRE-bound C/EBPalpha in EMSA exp
   174  suggest that RTA transactivation of the RAP RRE is mediated by an interaction with DNA-bound C/EBPal
  
  
  
  
   179 RE hairpin and to visualize the complete Rev-RRE RNP, demonstrating that RRE binding drives assembly 
  
  
  
   183  trajectories recorded during individual Rev-RRE assembly reactions has revealed the microscopic rate
   184  assembly and dissociation of individual Rev-RRE complexes in the presence or absence of DDX1 were ob
  
  
   187 rted in previous bulk kinetic studies of Rev-RRE association, indicating that oligomerization is an e
  
   189 tering (SAXS) reveals two major steps of Rev-RRE complex formation, beginning with rapid Rev binding 
  
  
   192  or dominant-negative mutants suppressed Rev-RRE-function in the export of incompletely spliced HIV-1
  
  
  
  
   197 el of activity throughout infection, the Rev-RRE system can fluctuate, presumably to control replicat
   198 interface that enhances association with Rev-RRE and poises NES binding sites to interact with a Rev 
  
  
  
   202 m of the RRE promotes greater functional Rev/RRE activity compared to the four stem-loop counterpart.
  
  
   205 -1 structural proteins in the absence of Rev/RRE is caused by inefficient accumulation of mRNA in the
  
  
  
  
  
   211   Mechanistic studies indicated that the Rev/RRE-mediated inhibition did not involve either nuclear r
  
   213 ) into a truncated form of the RRE sequence (RRE-IIB) allowed the binding of an arginine-rich peptide
   214 uorescently labeled Rev monomers to a single RRE molecule was visualized, and the event frequencies a
  
  
  
   218 are necessary and sufficient for substantial RRE function, provided they are joined by a flexible lin
   219 dependent viral gag-pol mRNAs bearing tandem RREs (GP-2xRRE), rescue virus particle production in mur
  
   221  their high-affinity binding to the targeted RRE mRNA following coupling to the Rev peptide, this cla
   222 the complete Rev-RRE RNP, demonstrating that RRE binding drives assembly of Rev homooligomers into as
  
   224 eins that can bind to HIV RNA containing the RRE in vivo but are unable to mediate the export of this
   225  accounts for the specificity of Rev for the RRE and thus the specific recognition of the viral RNA. 
  
  
  
  
   230    However, two silent G->A mutations in the RRE (RRE61) confer RevM10 resistance, which prompted us 
   231 H3NE) that bind to the EBSs contained in the RRE and BTE, we used EBS-RRE and BTE oligonucleotides in
  
   233 a high-affinity site in stem-loop IIB of the RRE and proceeds rapidly by addition of single Rev monom
   234 stem, we demonstrated that the region of the RRE and TATA box constitutes an ORF50/Rta-dependent prom
   235  partially spliced viral RNA; binding of the RRE by the viral Rev protein induces nuclear export of R
   236 onstrate that the five stem-loop form of the RRE promotes greater functional Rev/RRE activity compare
   237 nopurine (2-AP) into a truncated form of the RRE sequence (RRE-IIB) allowed the binding of an arginin
  
  
   240 igh affinity for the Rev binding site on the RRE (K(d) <or= 10 nM), but few compounds have a high spe
  
   242 by cooperative oligomerization of Rev on the RRE scaffold and utilizes both protein-protein and prote
   243 in enhancement of Rev oligomerization on the RRE that is correlated with an RNA structural change wit
   244 cate that Rev assembles cooperatively on the RRE via a series of symmetrical tail-to-tail and head-to
  
  
  
  
  
   250 DX1 acts as an RNA chaperone, remodeling the RRE into a conformation that is pre-organized to bind th
  
  
  
  
  
  
   257  mutants, we show that DDX1 acts through the RRE RNA to specifically accelerate the nucleation step o
  
  
   260 DX21 was shown to enhance Rev binding to the RRE in a manner similar to that previously described for
  
   262 nity binding of multiple Rev monomers to the RRE is achieved on a much faster timescale than reported
  
   264 ggest that RSG 1.2 binds more tightly to the RRE sequence than Rev by forming more base-specific cont
   265 show here that initial binding of Rev to the RRE triggers RNA tertiary structural changes, enabling f
   266 t the binding of an ORF50/Rta protein to the RRE was essential for ori-Lyt-dependent DNA replication.
  
  
   269  The structure supports a model in which the RRE utilizes the inherent plasticity of Rev subunit inte
   270 ssay, both K-Rta and ORF59 interact with the RRE and C/EBPalpha binding motifs within oriLyt in cells
   271 ripts in vivo, interacting directly with the RRE and Rev in vitro, and promoting Rev oligomerization 
  
   273 yt DNA through RTA, which interacts with the RRE, as well as K8, which binds to a cluster of C/EBP bi
  
  
   276      We undertook a comparative study of the RREs of PAN RNA, ORF57, vIL-6, and Kpsn to understand ho
  
  
   279  assess functional differences between these RRE 'conformers', we created conformationally locked mut
  
  
  
   283  the stoichiometry of Rev peptide binding to RRE can be accurately determined by using this single-QD
   284 competes with the Rev peptide for binding to RRE-IIB (K(D) approximately 0.1 +/- 0.05 microM) and a w
   285  proflavine competes with Rev for binding to RRE-IIB by binding as a dimer to a single high-affinity 
   286     The results indicate that DB340 binds to RRE in a highly structured and cooperative complex at a 
   287  essential viral protein Rev, which binds to RRE RNA, to export their unspliced and partially spliced
   288 de-RNA complexes of Rev and RSG 1.2 bound to RRE stem IIB have been solved and reveal gross structura
  
  
  
   292 d that enables concurrent recognition of two RREs, thereby plausibly targeting tandem RREs present in
  
   294 e N-terminal domain of SuiB adopts a typical RRE (RiPP recognition element) motif, which has been imp
   295 ing replication, identify previously unknown RREs, such as one in BALF5p, and highlight the complexit
   296 dramatic rearrangement of the Rev-dimer upon RRE binding through re-packing of its hydrophobic protei
   297 end-diastolic diameter changes compared with RRE were -2.8 mm (-5.2 to -0.4 mm; P=0.02) in HIIT and -
   298 the Rev and RSG 1.2 peptides in complex with RRE stem IIB have been simulated to better understand on
  
  
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