Traditional box

An RBCC (RING finger, B-box, and coiled-coil) protein was identified that belongs to the superfamilyof zinc-binding proteins and is specifically expressed in the gill of eel, Anguilla japonica. Euryhaline fishes such as eels canmigrate between freshwater and seawater, which is considered to be accomplished by efficient remodeling of the architecture and function of the gill, a major osmoregulatory organ.

10p tumor12 22-04-2013 38 3   Download

Ribonucleotide reductase is essential for the synthesis of all four dNTPs required for DNA replication. The enzyme is composed of two proteins, R1 and R2, which are both needed for activity. Expression of the R1 andR2mRNAs is restricted to the S-phase of the cell cycle, but the R1 andR2 promoters shownoobvious sequence homologies that could indicate coordination of transcription.

11p fptmusic 16-04-2013 41 3   Download

The humanSUV3gene encodes an NTP-dependent DNA⁄RNA DExH box helicase predominantly localized in mitochondria. Its orthologue in yeast is a component of the mitochondrial degradosome complex involved in the mtRNA decay pathway. In contrast to this, the physiological func-tion of human SUV3remains to be elucidated. In this report we demon-strate that the hSuv3 protein interacts with HBXIP, previously identified as a cofactor of survivin in suppression of apoptosis and as a protein that binds the HBx protein encoded by the hepatitis B virus....

12p fptmusic 12-04-2013 40 3   Download

Members of atRNA Gly 1 multigene family from the silkwormBombyx mori have been classified based on their transcriptions in homologous nuclear extracts, into three groups of highly, moderately and poorly transcribed genes. Because all these gene copies have identical coding sequences and consequently identical promoter elements (the A and B boxes), the flanking sequences modulate their expression levels. Here we demonstrate the inter-action of transcription factor TFIIIB with these genes and its role in regu-lating differential transcriptions....

15p fptmusic 12-04-2013 39 2   Download

Neuronal PAS domain protein 2 (NPAS2) is an important transcription factor associated with circadian rhythms. This protein forms a heterodimer with BMAL1, which binds to the E-box sequence to mediate circadian rhythm-regulated transcription. NPAS2 has two PAS domains with heme-binding sites in the N-terminal portion. In this study, we overexpressed wild-type and His mutants of the PAS-B domain (residues 241–416) of mouse NPAS2 and then purified and characterized the isolated heme-bound proteins....

10p fptmusic 11-04-2013 46 2   Download

Serum response factor (SRF) is a MADS transcription factor that binds to the CArG box sequence of the serum response element (SRE). Through its binding to CArG sequences, SRF activates several muscle-specific genes as well as genes that respond to mitogens. The thermodynamic parameters of the interaction of core-SRF (the 124–245 fragment of serum response fac-tor) with specific oligonucleotides from c-fos anddesminpromoters, were determined by spectroscopy.

15p fptmusic 11-04-2013 43 4   Download

The ability ofEntamoeba histolyticaTATA binding protein (EhTBP) to interact with different TATA boxes in gene promoters may be one of the key factors to perform an efficient transcription in this human parasite. In this paper we used several TATA variants to study the in vitro EhTBP DNA-binding activity and to determine the TATA-EhTBP dissociation constants. The presence of EhTBP in complexes formed by nuclear extracts (NE) and the TATTTAAA oligonucleotide, which corresponds to the canonical TATA box for E. histolytica, was demonstrated by gel-shift assays. ...

13p awards 06-04-2013 50 2   Download

Retinoid receptors are ligand-dependent transcription factors belonging to the nuclear receptor superfamily. Retinoic acid (RARa, b, c) and retinoid X (RXRa, b, c) receptors mediate the retinoid/rexinoid signal to the transcriptional machineries by interacting at the first level with coactivators or corepressors, which leads to the recruitment of enzymatically active noncovalent com-plexes at target gene promoters.

10p awards 05-04-2013 36 4   Download

A small anaerobically induced tomato transcription factor was isolated from a subtractive library. This factor, desig-nated ABZ1 (anaerobic basic leucine zipper), is anaerobi-cally induced in fruits, leaves and roots and encodes a nuclear localized protein. ABZ1 shares close structural and sequence homology with the S-family of small basic leucine zipper (bZIP) transcription factors that are implicated in stress response.Nuclear localizationofABZ1 ismediatedby the basic region and occurs under normoxic conditions. ABZ1 binds to G-box-like target sites as a dimer. ...

11p awards 05-04-2013 47 2   Download

In eukaryotes, CpG methylation is an epigenetic DNA modification that is important for heterochromatin formation. Centromere protein B (CENP-B) specifically binds to the centromeric 17 base-pair CENP-B box DNA, which contains two CpG dinucleotides. In this study, we tested complex formation by the DNA-binding domain of CENP-B with methylated and unmethylated CENP-B box DNAs, and found that CENP-B preferentially binds to the unmethylated CENP-B box DNA.

8p awards 05-04-2013 30 5   Download

The mammalian small heat shock proteinaB-crystallin can be phosphorylated at three different sites, Ser19, Ser45 and Ser59. We compared the intracellular distribution of wild-type, nonphosphorylatable and all possible pseudophos-phorylation mutants ofaB-crystallin by immunoblot and immunocytochemical analyses of stable and transiently transfected cells. We observed that pseudophosphorylation at two (especially S19D/S45D) or all three (S19D/S45D/ S59D) sites induced the partial translocationofaB-crystallin from the detergent-soluble to the detergent-insoluble frac-tion....

9p awards 05-04-2013 42 4   Download

A putative transcription factor, named RAMY, that binds to the 20-bp O2S sequences of the regulatory region of the Amy2genepromoter has been identifiedusing the yeast one-hybrid system from a rice library. The full lengthRAMY cDNA clone encodes a 218-amino acid protein and is homologous to the late embryogenesis-abundant protein (LEA5). In vitromutagenesis and electrophoretic mobility shift assays confirmed that RAMY can bind with O2S spe-cifically throughanunusual zincfingerwithaCXCX4CX2H consensus sequence. ...

0p awards 05-04-2013 58 2   Download

As a critical step of the preinitiation complex assembly in transcription, the general transcription factor TFIIB forms a complex with the TATA-box binding protein (TBP) bound to a promoter element. Transcriptional activators such as the herpes simplex virus VP16 facilitate this com-plex formation through conformational activation of TFIIB, a focal molecule of transcriptional initiation and activation.

9p dell39 03-04-2013 38 3   Download

Vascular endothelial growth factor (VEGF) is a key regu-lator of angiogenesis and post-transcriptional regulation plays a major role in VEGF expression. Both the 5¢-and 3¢-UTR are required for VEGF post-transcriptional regu-lation but factors binding to functional sequences within the 5¢-UTR have not been fully characterized. We report here the identification of complexes, binding to theVEGF mRNA 5¢-and3¢-UTR, that contain cold shock domain (CSD) and polypyrimidine tract binding (PTB) RNA binding proteins. ...

13p dell39 03-04-2013 42 5   Download

We have investigated the consequences of introducing a bisecting GlcNAc moiety into biantennary N-glycans. Computational analysis of glycan conformation with pro-longed simulation periods in vacuo and in a solvent box revealed two main effects: backfolding of thea1–6 arm and stacking of the bisectingGlcNAc and the neighboring Man/ GlcNAc residues of both antennae.Chemoenzymatic syn-thesis produced the bisecting biantennary decasaccharide N-glycan and itsa2–3(6)-sialylated variants.

17p dell39 03-04-2013 45 5   Download

The suppressors of cytokine signalling (SOCS) proteins inhibit cytokine signalling by direct interaction with Janus kinases (JAKs) or activated cytokine receptors. In addition to the N-ter-minal and SH2 domains that mediate these interactions, SOCS proteins contain a C-terminal SOCS box. Evidence suggests SOCS box-containing proteins act as part of an elongin-cullin-SOCS (ECS) E3 ubiquitin ligase complex, marking target pro-teins for degradation.

35p inspiron33 26-03-2013 58 6   Download

The zinc-finger cellular nucleic acid binding protein (CNBP) is a strikingly conserved single-stranded nucleic acid binding protein essential for normal forebrain formation during mouse and chick embryogenesis. CNBP cDNAs from a number of vertebrates have been cloned and analysed. CNBP is mainly conformed by seven retroviral Cys-Cys-His-Cys zinc-knuckles and a glycine⁄arginine rich region box.

13p inspiron33 23-03-2013 42 3   Download

RNA helicases mediate structural rearrangements of RNA or RNA–pro-tein complexes at the expense of ATP hydrolysis. Members of the DEAD box helicase family consist of two flexibly connected helicase domains. They share nine conserved sequence motifs that are involved in nucleotide binding and hydrolysis, RNA binding, and helicase activity.

11p inspiron33 23-03-2013 47 5   Download

Y-box proteins constitute an evolutionarily conserved family of DNA- and RNA-binding proteins involved in the regulation of transcription and translation. In the dipteran Chironomus tentans, a homologue to the verte-brate Y-box protein YB-1 was recently characterized and designated ctYB-1. It is transferred from nucleus to cytoplasm bound to mRNA and is likely to affect translation.

10p inspiron33 23-03-2013 34 4   Download

LeIF, aLeishmaniaprotein similar to the eukaryotic initiation factor eIF4A, which is a prototype of the DEAD box protein family, was origin-ally described as a Th1-type natural adjuvant and as an antigen that indu-ces an IL12-mediated Th1 response in the peripheral blood mononuclear cells of leishmaniasis patients.

15p inspiron33 23-03-2013 37 4   Download