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https://www.readbyqxmd.com/read/28441794/reciprocal-interactions-of-leukemic-cells-with-bone-marrow-stromal-cells-promote-enrichment-of-leukemic-stell-cell-compartments-in-response-to-curcumin-and-daunorubicin
#1
Saeed Mohammadi, Mohsen Nikbakht, Seyed Mehdi Sajjadi, Fariba Rad, Bahram Chahardouli, Javid Sabour Takanlu, Shahrbano Rostami, Kamran Alimoghaddam, Ardeshir Ghavamzadeh, Seyed H Ghaffari
A predominant challenge in developing curative leukemia therapy is interactions of leukemic cells with the bone marrow stromal microenvironment. We aimed to investigate the role of stromal cells, such as bone marrow mesenchymal stromal cells (BMSCs) and osteoblasts (OBs), in curcumin (CUR) and daunorubicin (DNR) induced apoptosis of acute myeloid leukemia (AML) cells. We used KG1 and U937 as leukemia cell line models and treated them with CUR and DNR. The cells were then co-cultured with BMSCs or a combination of BMSCs and OBs as feeders...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28441628/potassium-deficiency-affects-the-carbon-nitrogen-balance-in-cotton-leaves
#2
Wei Hu, Taylor D Coomer, Dimitra A Loka, Derrick M Oosterhuis, Zhiguo Zhou
Potassium (K) plays important roles in the metabolism of carbon (C) and nitrogen (N), but studies of K deficiency affecting C-N balance are lacking. This study explored the influence of K deficiency on C-N interaction in cotton leaves by conducting a field experiment with cotton cultivar DP0912 under two K rates (K0: 0 kg K2O ha(-1) and K67: 67 kg K2O ha(-1)) and a controlled environment experiment with K-deficient solution (K1: 0 mM K(+)) and K-sufficient solution (K2: 6 mM K(+)). The results showed that leaf K content, leaf number, leaf area, boll number, reproductive dry weight and total dry weight were significant lower under K deficiency (K0 or K1)...
April 6, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28441625/influence-of-co-existed-tetrabromobisphenol-a-tbbpa-and-hexavalent-chromium-on-the-cellular-characteristics-of-pycnoporus-sanguineus-during-their-removal-and-reduction
#3
Mi Feng, Hua Yin, Hui Peng, Xintong Liu, Pingping Yang, Guining Lu, Zhi Dang
Simultaneous TBBPA removal and Cr(VI) reduction by Pycnoporus sanguineus together with the effect of these co-existed pollutants on the fungal cellular characteristics were investigated in this study, aiming at illuminating the mechanism involved in the interactions between contaminants and microbial cells. The results revealed that Cr(VI) reduction and TBBPA removal declined from 92.5%, 75.4-30.6%, 44.8% when Cr(VI) concentration increased from 5 to 40mg/L, respectively. The removal efficiencies for Cr(VI) and TBBPA reached 61...
April 22, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28441541/molecular-interaction-of-2-4-diacetylphloroglucinol-dapg-with-human-serum-albumin-hsa-the-spectroscopic-calorimetric-and-computational-investigation
#4
Pragna Lakshmi T, Moumita Mondal, Krishna Ramadas, Sakthivel Natarajan
Drug molecule interaction with human serum albumin (HSA) affects the distribution and elimination of the drug. The compound, 2,4-diacetylphloroglucinol (DAPG) has been known for its antimicrobial, antiviral, antihelminthic and anticancer properties. However, its interaction with HSA is not yet reported. In this study, the interaction between HSA and DAPG was investigated through steady-state fluorescence, time-resolved fluorescence (TRF), circular dichroism (CD), Fourier transform infrared (FT-IR) spectroscopy, isothermal titration calorimetry (ITC), molecular docking and molecular dynamics simulation (MDS)...
April 18, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28441533/a-global-view-of-rna-protein-interactions-identifies-post-transcriptional-regulators-of-root-hair-cell-fate
#5
Shawn W Foley, Sager J Gosai, Dongxue Wang, Nur Selamoglu, Amelia C Sollitti, Tino Köster, Alexander Steffen, Eric Lyons, Fevzi Daldal, Benjamin A Garcia, Dorothee Staiger, Roger B Deal, Brian D Gregory
The Arabidopsis thaliana root epidermis is comprised of two cell types, hair and nonhair cells, which differentiate from the same precursor. Although the transcriptional programs regulating these events are well studied, post-transcriptional factors functioning in this cell fate decision are mostly unknown. Here, we globally identify RNA-protein interactions and RNA secondary structure in hair and nonhair cell nuclei. This analysis reveals distinct structural and protein binding patterns across both transcriptomes, allowing identification of differential RNA binding protein (RBP) recognition sites...
April 24, 2017: Developmental Cell
https://www.readbyqxmd.com/read/28441530/aubergine-controls-germline-stem-cell-self-renewal-and-progeny-differentiation-via-distinct-mechanisms
#6
Xing Ma, Xiujuan Zhu, Yingying Han, Benjamin Story, Trieu Do, Xiaoqing Song, Su Wang, Ying Zhang, Marco Blanchette, Madelaine Gogol, Kate Hall, Allison Peak, Perera Anoja, Ting Xie
Piwi family protein Aubergine (Aub) maintains genome integrity in late germ cells of the Drosophila ovary through Piwi-associated RNA-mediated repression of transposon activities. Although it is highly expressed in germline stem cells (GSCs) and early progeny, it remains unclear whether it plays any roles in early GSC lineage development. Here we report that Aub promotes GSC self-renewal and GSC progeny differentiation. RNA-iCLIP results show that Aub binds the mRNAs encoding self-renewal and differentiation factors in cultured GSCs...
April 24, 2017: Developmental Cell
https://www.readbyqxmd.com/read/28441527/proteostasis-or-aging-let-the-chips-fall-where-they-may
#7
Robyn Branicky, Siegfried Hekimi
The conserved E3 ubiquitin ligase CHIP/CHN-1 contributes to proteostasis by ubiquitylating HSP70 and HSP90-interacting proteins. In a recent issue of Cell,Tawo et al. (2017) show that CHIP/CHN-1 also directly ubiquitylates the insulin receptor INSR/DAF-2 to regulate its turnover. These findings suggest an unexpected interpretation of the effects of altered proteostasis on survival.
April 24, 2017: Developmental Cell
https://www.readbyqxmd.com/read/28441450/commensal-bacteria-and-essential-amino-acids-control-food-choice-behavior-and-reproduction
#8
Ricardo Leitão-Gonçalves, Zita Carvalho-Santos, Ana Patrícia Francisco, Gabriela Tondolo Fioreze, Margarida Anjos, Célia Baltazar, Ana Paula Elias, Pavel M Itskov, Matthew D W Piper, Carlos Ribeiro
Choosing the right nutrients to consume is essential to health and wellbeing across species. However, the factors that influence these decisions are poorly understood. This is particularly true for dietary proteins, which are important determinants of lifespan and reproduction. We show that in Drosophila melanogaster, essential amino acids (eAAs) and the concerted action of the commensal bacteria Acetobacter pomorum and Lactobacilli are critical modulators of food choice. Using a chemically defined diet, we show that the absence of any single eAA from the diet is sufficient to elicit specific appetites for amino acid (AA)-rich food...
April 2017: PLoS Biology
https://www.readbyqxmd.com/read/28441351/probing-temperature-and-ph-dependent-binding-between-quantum-dots-and-bovine-serum-albumin-by-fluorescence-correlation-spectroscopy
#9
Zonghua Wang, Qiyan Zhao, Menghua Cui, Shichao Pang, Jingfang Wang, Ying Liu, Liming Xie
Luminescent quantum dots (QDs) with unique optical properties have potential applications in bio-imaging. The interaction between QDs and bio-molecules is important to the biological effect of QDs in vivo. In this paper, we have employed fluorescence correlation spectroscopy (FCS) to probe the temperature- and pH-dependent interactions between CdSe QDs with carboxyl (QDs-COOH) and bovine serum albumin (BSA) in buffer solutions. The results have shown that microscopic dissociation constant K'D is in the range of (1...
April 25, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28441340/selection-characterization-and-interaction-studies-of-a-dna-aptamer-for-the-detection-of-bifidobacterium-bifidum
#10
Lujun Hu, Linlin Wang, Wenwei Lu, Jianxin Zhao, Hao Zhang, Wei Chen
A whole-bacterium-based SELEX (Systematic Evolution of Ligands by Exponential Enrichment) procedure was adopted in this study for the selection of an ssDNA aptamer that binds to Bifidobacterium bifidum. After 12 rounds of selection targeted against B. bifidum, 30 sequences were obtained and divided into seven families according to primary sequence homology and similarity of secondary structure. Four FAM (fluorescein amidite) labeled aptamer sequences from different families were selected for further characterization by flow cytometric analysis...
April 25, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28441108/novel-clades-of-the-hu-ihf-superfamily-point-to-unexpected-roles-in-the-eukaryotic-centrosome-chromosome-partitioning-and-biological-conflicts
#11
A Maxwell Burroughs, Gurmeet Kaur, Dapeng Zhang, L Aravind
The HU superfamily of proteins, with a unique DNA-binding mode, has been extensively studied as the primary chromosome-packaging protein of the bacterial superkingdom. Representatives also play a role in DNA-structuring during recombination events and in eukaryotic organellar genome maintenance. However, beyond these well-studied roles, little is understood of the functional diversification of this large superfamily. Using sensitive sequence and structure analysis methods we identify multiple novel clades of the HU superfamily...
April 25, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28441013/cytotoxicity-of-pyrazine-based-cyclometalated-c-n-pz-c-au-iii-carbene-complexes-impact-of-the-nature-of-the-ancillary-ligand-on-the-biological-properties
#12
Benoît Bertrand, Julio Fernandez-Cestau, Jesus Angulo, Marco M D Cominetti, Zoë A E Waller, Mark Searcey, Maria A O'Connell, Manfred Bochmann
The synthesis of a series of cyclometalated gold(III) complexes supported by pyrazine-based (C^N^C)-type pincer ligands is reported, including the crystal structure of a cationic example. The compounds provide a new platform for the study of antiproliferative properties of gold(III) complexes. Seven complexes were tested: the neutral series (C^N(pz)^C)AuX [X = Cl (1), 6-thioguanine (4), C≡CPh (5), SPh (6)] and an ionic series that included the N-methyl complex [(C^N(pzMe)^C)AuCl]BF4 (7) and the N-heterocyclic carbene complexes [(C^N(pz)^C)AuL](+) with L = 1,3-dimethylbenzimidazol-2-ylidene (2) or 1,3,7,9-tetramethylxanthin-8-ylidene (3)...
April 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28441004/insights-into-the-mechanisms-by-which-clostridial-neurotoxins-discriminate-between-gangliosides
#13
Joshua R Burns, Gregory S Lambert, Michael R Baldwin
Botulinum neurotoxins (BoNTs) and Tetanus neurotoxin (TeNT) are the causative agents of the paralytic diseases botulism and tetanus, respectively. Entry of toxins into neurons is mediated through initial interactions with gangliosides, followed by binding to a protein co-receptor. Herein we aimed to understand the mechanism through which individual neurotoxins recognize the carbohydrate motif of gangliosides. Using cell-based and in vitro binding assays, in conjunction with structure-driven site directed mutagenesis, a conserved hydrophobic residue within the BoNTs that contributes to both affinity and specificity towards Sia5-containing gangliosides was identified...
April 25, 2017: Biochemistry
https://www.readbyqxmd.com/read/28440919/rev7-the-regulatory-subunit-of-pol%C3%AE-undergoes-uv-induced-and-cul4-dependent-degradation
#14
Audesh Bhat, Zhoushuai Qin, Guifen Wang, Wangyang Chen, Wei Xiao
In eukaryotic cells, Rev7 interacts with Rev3 and functions as a regulatory subunit of Polζ, a translesion DNA synthesis (TLS) polymerase. In addition to its role in TLS, mammalian Rev7, also known as Mad2B/Mad2L2, participates in multiple cellular activities including cell cycle progression and double-strand break repair through its interaction with several proteins. Here we show that in mammalian cells Rev7 undergoes ubiquitin/proteasome-mediated degradation upon UV irradiation in a time-dependent manner...
April 25, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28440909/roles-of-the-pdz-binding-motif-of-hpv-16-e6-protein-in-oncogenic-transformation-of-human-cervical-keratinocytes
#15
Yuki Yoshimatsu, Tomomi Nakahara, Katsuyuki Tanaka, Yuki Inagawa, Mako Narisawa-Saito, Takashi Yugawa, Shin-Ichi Ohno, Masatoshi Fujita, Hitoshi Nakagama, Tohru Kiyono
The high-risk human papillomavirus E6 proteins have been shown to interact with and lead degradation of PDZ-domain-containing proteins through its carboxy-terminal motif. This PDZ-binding motif plays important roles in transformation of cultured cells and carcinogenesis of E6-transgenic mice. However, its biological effects on the natural host cells have not been elucidated. We have examined its roles in an in vitro carcinogenesis model for cervical cancer, in which E6 and E7 together with activated HRAS (HRAS(G)(12V) ) can induce tumorigenic transformation of normal human cervical keratinocytes...
April 25, 2017: Cancer Science
https://www.readbyqxmd.com/read/28440894/chromatin-sumoylation-in-heat-stress-to-protect-pause-and-organise-sumo-stress-response-on-chromatin
#16
REVIEW
Einari A Niskanen, Jorma J Palvimo
Post-translational modifications, e.g. SUMO modifications (SUMOylation), provide a mechanism for swiftly changing a protein's activity. Various stress conditions trigger a SUMO stress response (SSR) - a stress-induced rapid change in the conjugation of SUMO to multiple proteins, which predominantly targets nuclear proteins. The SSR has been postulated to protect stressed cells by preserving the functionality of crucial proteins. However, it is unclear how it exerts its protective functions. Interestingly, heat stress (HS) increases SUMOylation of proteins at active promoters and enhancers...
April 25, 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/28440865/generation-of-wavy-structure-on-lipid-membrane-by-peripheral-proteins-a-linear-elastic-analysis
#17
Paritosh Mahata, Sovan Lal Das
We carry out a linear elastic analysis to study wavy structure generation on lipid membrane by peripheral membrane proteins. We model the lipid membrane as linearly elastic and anisotropic material. The hydrophobic insertion by proteins into the lipid membrane has been idealized as penetration of rigid rodlike inclusions into the membrane and the electrostatic interaction between protein and membrane has been modeled by a distributed surface traction acting on the membrane surface. With the proposed model we study curvature generation by several binding domains of peripheral membrane proteins containing BAR domains and amphipathic alpha-helices...
April 25, 2017: FEBS Letters
https://www.readbyqxmd.com/read/28440746/dual-interaction-of-scaffold-protein-tim44-of-mitochondrial-import-motor-with-channel-forming-translocase-subunit-tim23
#18
See-Yeun Ting, Nicholas L Yan, Brenda A Schilke, Elizabeth A Craig
Proteins destined for the mitochondrial matrix are targeted to the inner membrane Tim17/23 translocon by their presequences. Inward movement is driven by the matrix-localized, Hsp70-based motor. The scaffold Tim44, interacting with the matrix face of the translocon, recruits other motor subunits and binds incoming presequence. The basis of these interactions and their functional relationships remains unclear. Using site-specific in vivo crosslinking and genetic approaches in Saccharomyces cerevisiae, we found that both domains of Tim44 interact with the major matrix-exposed loop of Tim23, with the C-terminal domain (CTD) binding Tim17 as well...
April 25, 2017: ELife
https://www.readbyqxmd.com/read/28440734/cholinergic-activation-suppresses-palmitate-induced-macrophage-activation-and-improves-acylation-stimulating-protein-resistance-in-co-cultured-adipocytes
#19
Jing Wu, Zhou-Yang Jiao, Rui-Zhen Li, Hui-Ling Lu, Hao-Hao Zhang, Katherine Cianflone
Acylation-stimulating protein (ASP), produced through activation of the alternative complement immune system, modulates lipid metabolism. Using a trans-well co-culture cell model, the mitigating role of α7-nicotinic acetylcholine receptor (α7nAChR)-mediated cholinergic pathway on ASP resistance was evaluated. ASP signaling in adipocytes via its receptor C5L2 and signaling intermediates Gαq, Gβ, phosphorylated protein kinase C-α, and protein kinase C-ζ were markedly suppressed in the presence of TNFα or medium from palmitate-treated RAW264...
May 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28440563/the-sumo-e3-ligase-mdsiz1-promotes-anthocyanin-accumulation-by-sumoylating-mdmyb1-under-low-temperature-conditions-in-apple
#20
Li-Jie Zhou, Yuan-Yuan Li, Rui-Fen Zhang, Chun-Ling Zhang, Xing-Bin Xie, Cheng Zhao, Yu-Jin Hao
MdMYB1 acts as a crucial component of the MYB-bHLH-WD40 (MBW) complex to regulate anthocyanin biosynthesis in red-skinned apples (Malus domestica), but little is known about its posttranslational regulation. Here, a SUMO E3 ligase MdSIZ1 was screened out as an MdMYB1-interacting protein with a yeast two-hybridization approach. The interaction between MdSIZ1 and MdMYB1 was further verified with pull-down and CoIP assays. Furthermore, it was found that MdSIZ1 directly sumoylated MdMYB1 proteins in vivo and in vitro, especially under moderately low temperature (17 °C) conditions, and that this sumoylation was required for MdMYB1 protein stability...
April 25, 2017: Plant, Cell & Environment
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