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Yi Zhang, Hong Xu
Mitochondria are generated by the expression of genes on both nuclear and mitochondrial genome. Mitochondrial biogenesis is highly plastic in response to cellular energy demand, developmental signals and environmental stimuli. Mechanistic target of rapamycin (mTOR) pathway regulates mitochondrial biogenesis to co-ordinate energy homeostasis with cell growth. The local translation of mitochondrial proteins on the outer membrane facilitates their efficient import and thereby allows prodigious mitochondrial biogenesis during rapid cell growth and proliferation...
December 15, 2016: Biochemical Society Transactions
Lei Xu, Ren Kong, Jingyu Zhu, Huiyong Sun, Shan Chang
LARP7, a member of the La-related proteins (LARPs), shares a conserved La module comprising the La-motif (LAM) and the RNA-recognition motif (RRM1), binding exclusively to the non-coding RNA 7SK. LARP7 is a component of the small nuclear ribonucleoprotein (7SKsnRNP) required for the stability and function of the RNA, and implicated in the transcription termination and regulation of translation. In the current work, molecular dynamics simulations were employed to investigate the recently determined crystal structures of the La module of LARP7 in complexs with a stretch of uridines at the 3'-end of 7SK in the presence and absence of RNA and two different mutants...
July 19, 2016: Molecular BioSystems
Yi Zhang, Yong Chen, Marjan Gucek, Hong Xu
Early embryonic development features rapid nuclear DNA replication cycles, but lacks mtDNA replication. To meet the high-energy demands of embryogenesis, mature oocytes are furnished with vast amounts of mitochondria and mtDNA However, the cellular machinery driving massive mtDNA replication in ovaries remains unknown. Here, we describe a Drosophila AKAP protein, MDI that recruits a translation stimulator, La-related protein (Larp), to the mitochondrial outer membrane in ovaries. The MDI-Larp complex promotes the synthesis of a subset of nuclear-encoded mitochondrial proteins by cytosolic ribosomes on the mitochondrial surface...
May 17, 2016: EMBO Journal
Dian-Fu Chen, Cheng Lin, Hong-Liang Wang, Li Zhang, Li Dai, Sheng-Nan Jia, Rong Zhou, Ran Li, Jin-Shu Yang, Fan Yang, James S Clegg, Hiromichi Nagasawa, Wei-Jun Yang
BACKGROUND: In eukaryotes, tRNA trafficking between the nucleus and cytoplasm is a complex process connected with cell cycle regulation. Such trafficking is therefore of fundamental importance in cell biology, and disruption of this process has grave consequences for cell viability and survival. To cope with harsh habitats, Artemia has evolved a special reproductive mode to release encysted embryos in which cell division can be maintained in a dormancy state for a long period. RESULTS: Using Artemia as a peculiar model of the cell cycle, an La-related protein from Artemia, named Ar-Larp, was found to bind to tRNA and accumulate in the nucleus, leading to cell cycle arrest and controlling the onset of diapause formation in Artemia...
March 3, 2016: BMC Biology
Leigh A McGarvie, Marta Martinez-Lopez, Ann M Burgess, Hamish G MacDougall, Ian S Curthoys
BACKGROUND/HYPOTHESIS: With the video head impulse test (vHIT), the vertical VOR gain is defined as (vertical eye velocity/vertical head velocity), but compensatory eye movements to vertical canal stimulation usually have a torsional component. To minimize the contribution of torsion to the eye movement measurement, the horizontal gaze direction should be directed 40° from straight ahead so it is in the plane of the stimulated canal plane pair. HYPOTHESIS: as gaze is systematically moved horizontally away from canal plane alignment, the measured vertical VOR gain should decrease...
2015: Frontiers in Neurology
Feng Zhang, Haizheng Zhong, Cheng Chen, Xian-gang Wu, Xiangmin Hu, Hailong Huang, Junbo Han, Bingsuo Zou, Yuping Dong
Organometal halide perovskites are inexpensive materials with desirable characteristics of color-tunable and narrow-band emissions for lighting and display technology, but they suffer from low photoluminescence quantum yields at low excitation fluencies. Here we developed a ligand-assisted reprecipitation strategy to fabricate brightly luminescent and color-tunable colloidal CH3NH3PbX3 (X = Br, I, Cl) quantum dots with absolute quantum yield up to 70% at room temperature and low excitation fluencies. To illustrate the photoluminescence enhancements in these quantum dots, we conducted comprehensive composition and surface characterizations and determined the time- and temperature-dependent photoluminescence spectra...
April 28, 2015: ACS Nano
Luigi Martino, Simon Pennell, Geoff Kelly, Baptiste Busi, Paul Brown, R Andrew Atkinson, Nicholas J H Salisbury, Zi-Hao Ooi, Kang-Wei See, Stephen J Smerdon, Caterina Alfano, Tam T T Bui, Maria R Conte
The La-related proteins (LARPs) form a diverse group of RNA-binding proteins characterized by the possession of a composite RNA binding unit, the La module. The La module comprises two domains, the La motif (LaM) and the RRM1, which together recognize and bind to a wide array of RNA substrates. Structural information regarding the La module is at present restricted to the prototypic La protein, which acts as an RNA chaperone binding to 3' UUUOH sequences of nascent RNA polymerase III transcripts. In contrast, LARP6 is implicated in the regulation of collagen synthesis and interacts with a specific stem-loop within the 5' UTR of the collagen mRNA...
January 2015: Nucleic Acids Research
Samuel Deem, Cordell R Davis, James P Tierney
Laparoscopic radical prostatectomy (LARP) has been accepted as first line therapy for clinically localized prostate cancer. Complications have been low and outcomes are comparable to that of open surgery with potential benefits including shorter hospital stay, less pain and quicker return to normal activity. Unexplained paralysis following LARP is a rare entity with no reported cases in the current literature. We report a case of complete motor paralysis following LARP. An extensive multidisciplinary evaluation did not definitively establish a diagnosis...
2008: Journal of Robotic Surgery
Nathaniel H Thayer, Christina K Leverich, Matthew P Fitzgibbon, Zara W Nelson, Kiersten A Henderson, Philip R Gafken, Jessica J Hsu, Daniel E Gottschling
Long-lived proteins have been implicated in age-associated decline in metazoa, but they have only been identified in extracellular matrices or postmitotic cells. However, the aging process also occurs in dividing cells undergoing repeated asymmetric divisions. It was not clear whether long-lived proteins exist in asymmetrically dividing cells or whether they are involved in aging. Here we identify long-lived proteins in dividing cells during aging using the budding yeast, Saccharomyces cerevisiae. Yeast mother cells undergo a limited number of asymmetric divisions that define replicative lifespan...
September 30, 2014: Proceedings of the National Academy of Sciences of the United States of America
Joke Dijkstra-Eshuis, Tine W L Van den Bos, Rosa Splinter, Rob F M Bevers, Willemijn C G Zonneveld, Hein Putter, Rob C M Pelger, Petra J Voorham-van der Zalm
AIMS: Laparoscopic radical prostatectomy (LARP) may cause stress urinary incontinence (SUI). This study reports the effects of preoperative pelvic floor muscle therapy (PFMT) on SUI and quality of life (QoL) in men undergoing LARP. MATERIALS AND METHODS: In this single-center randomized controlled trial, 122 patients undergoing LARP were assigned to an intervention group of PFMT with biofeedback once a week preoperatively, with 4 weeks' follow-up or to a control group receiving standard care...
February 2015: Neurourology and Urodynamics
Laurent Chatel-Chaix, Marie-Anne Germain, Alena Motorina, Éric Bonneil, Pierre Thibault, Martin Baril, Daniel Lamarre
Hepatitis C virus (HCV) orchestrates the different stages of its life cycle in time and space through the sequential participation of HCV proteins and cellular machineries; hence, these represent tractable molecular host targets for HCV elimination by combination therapies. We recently identified multifunctional Y-box-binding protein 1 (YB-1 or YBX1) as an interacting partner of NS3/4A protein and HCV genomic RNA that negatively regulates the equilibrium between viral translation/replication and particle production...
November 2013: Journal of Virology
Rawaa H Hussain, Mariam Zawawi, Mark A Bayfield
The La module is a conserved tandem arrangement of a La motif and RNA recognition motif whose function has been best characterized in genuine La proteins. The best-characterized substrates of La proteins are pre-tRNAs, and previous work using tRNA mediated suppression in Schizosaccharomyces pombe has demonstrated that yeast and human La enhance the maturation of these using two distinguishable activities: UUU-3'OH-dependent trailer binding/protection and a UUU-3'OH independent activity related to RNA chaperone function...
October 2013: Nucleic Acids Research
Xiao-Juan Wang, Ya-Kun Pang, Hui Cheng, Fang Dong, Hao-Yue Liang, Ying-Chi Zhang, Xiao-Min Wang, Jing Xu, Tao Cheng, Wei-Ping Yuan
Larp4b is a member of the LARP family, which can interact with RNA and generally stimulate the translation of mRNA. Abnormal expression of Larp4b can be found in leukemia patients in our previous study. This study was purposed to detect the relative expression of Larp4b mRNA in different subpopulations of mouse hematopoietic cells, to construct lentivirus vector containing shLarp4b targeting mouse gene Larp4b and to explore its effects on mouse Lin(-) cells infected with shLarp4b by lentivirus. SF-LV-shLarP4b-EGFP and control vectors were constructed and two-plasmid lentivirus packing system was used to transfect 293T cells...
June 2013: Zhongguo Shi Yan Xue Ye Xue za Zhi
Hamish Gavin Macdougall, Leigh Andrew McGarvie, Gabor Michael Halmagyi, Ian Stewart Curthoys, Konrad Peter Weber
BACKGROUND: The video head impulse test (vHIT) is a useful clinical tool to detect semicircular canal dysfunction. However vHIT has hitherto been limited to measurement of horizontal canals, while scleral search coils have been the only accepted method to measure head impulses in vertical canals. The goal of this study was to determine whether vHIT can detect vertical semicircular canal dysfunction as identified by scleral search coil recordings. METHODS: Small unpredictable head rotations were delivered by hand diagonally in the plane of the vertical semicircular canals while gaze was directed along the same plane...
2013: PloS One
Rémy Merret, Luigi Martino, Cécile Bousquet-Antonelli, Sara Fneich, Julie Descombin, Elodie Billey, Maria R Conte, Jean-Marc Deragon
La-related proteins (LARPs) are largely uncharacterized factors, well conserved throughout evolution. Recent reports on the function of human LARP4 and LARP6 suggest that these proteins fulfill key functions in mRNA metabolism and/or translation. We report here a detailed evolutionary history of the LARP4 and 6 families in eukaryotes. Genes coding for LARP4 and 6 were duplicated in the common ancestor of the vertebrate lineage, but one LARP6 gene was subsequently lost in the common ancestor of the eutherian lineage...
January 2013: RNA
Bangyue Zhang, Jianheng Jia, Min Yang, Chunxia Yan, Yuzhen Han
Leaf senescence is the final stage of leaf life history, and it can be regulated by multiple internal and external cues. La-related proteins (LARPs), which contain a well-conserved La motif (LAM) domain and normally a canonical RNA recognition motif (RRM) or noncanonical RRM-like motif, are widely present in eukaryotes. Six LARP genes (LARP1a-1c and LARP6a-6c) are present in Arabidopsis, but their biological functions have not been studied previously. In this study, we investigated the biological roles of LARP1c from the LARP1 family...
October 2012: Molecules and Cells
Xin Peng, Qing Sun, Na Li, Li-jun Yang, Jing Dai, Xi-zheng Shan
OBJECTIVE: The purpose of this study was to set up a method to analyze the vertical semicircular canal function and study the normal values of the vertical semicircular canal function using the vertical plane swing test. METHODS: A prospective analysis of 100 normal persons (aged from 18 to 59 years), who were treated by using the vertical plane swing test with the newly developed automatic vestibular function diagnosis and therapy system (SRM-IV). These persons were rotated 180° at a sinusoidal speed (acceleration 45°/s, maximum speed 90°/s) in the vertical semicircular canal plane...
January 2012: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
Luca Schenk, Dominik M Meinel, Katja Strässer, André P Gerber
The La-motif (LAM) is an ancient and ubiquitous RNA-binding domain defining a superfamily of proteins, which comprises the genuine La proteins and La-related proteins (LARPs). In contrast to La, which binds and stabilizes pre-tRNAs and other RNA polymerase III transcripts, data on function and RNA targets of the LARPs have remained scarce. We have undertaken a global approach to elucidate the previously suggested role of the yeast LARP Slf1p in copper homeostasis. By applying RNA-binding protein immunopurification-microarray (RIP-Chip) analysis, we show that Slf1p and its paralog Sro9p copurify with overlapping sets of hundreds of functionally related mRNAs, including many transcripts coding for ribosomal proteins and histones...
March 2012: RNA
Jarrett T Whelan, Sarah E Hollis, Dong Seok Cha, Adam S Asch, Myon-Hee Lee
The Ras-ERK/MAP (Mitogen-Activated Protein) kinase signaling pathway governs many cellular processes such as proliferation, differentiation, cell fate, homeostasis, and survival in all eukaryotes. Constitutive activation of the Ras-ERK/MAPK signaling pathway often leads to promotion of abnormal cell growth and tumorigenesis. Although the regulation of the Ras-ERK/MAPK signaling pathway by post-translational modification has been well elucidated, post-transcriptional regulations of this pathway are beginning to emerge in invertebrates and this work is extended to humans...
March 2012: Journal of Cellular Physiology
Esther Zanin, Anne Pacquelet, Claudia Scheckel, Rafal Ciosk, Monica Gotta
LA-related protein 1 (LARP-1) belongs to an RNA-binding protein family containing a LA motif. Here, we identify LARP-1 as a regulator of sex determination. In C. elegans hermaphrodites, a complex regulatory network regulates the switch from sperm to oocyte production. We find that simultaneous depletion of larp-1 and the Nanos homologue nos-3 results in germline masculinization. This phenotype is accompanied by a strong reduction of the levels of TRA-1, a GLI-family transcription factor that promotes oogenesis...
August 15, 2010: Journal of Cell Science
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