76
|
Yang H, Gors J, Meng M. Face-semblance leads to faster visual search and breaking interocular suppression. J Vis 2011. [DOI: 10.1167/11.11.661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
77
|
|
78
|
Sha L, Meng M. The effect of familiarity and novelty on visual preference across different object and scene categories. J Vis 2011. [DOI: 10.1167/11.11.840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
79
|
Pallett P, Meng M. Aftereffects for contrast-negated faces in gender and emotion categorization. J Vis 2011. [DOI: 10.1167/11.11.598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
80
|
Prasanth KR, Huang YW, Liou MR, Wang RYL, Hu CC, Tsai CH, Meng M, Lin NS, Hsu YH. Glyceraldehyde 3-phosphate dehydrogenase negatively regulates the replication of Bamboo mosaic virus and its associated satellite RNA. J Virol 2011; 85:8829-40. [PMID: 21715476 PMCID: PMC3165797 DOI: 10.1128/jvi.00556-11] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2011] [Accepted: 06/21/2011] [Indexed: 01/24/2023] Open
Abstract
The identification of cellular proteins associated with virus replicase complexes is crucial to our understanding of virus-host interactions, influencing the host range, replication, and virulence of viruses. A previous in vitro study has demonstrated that partially purified Bamboo mosaic virus (BaMV) replicase complexes can be employed for the replication of both BaMV genomic and satellite BaMV (satBaMV) RNAs. In this study, we investigated the BaMV and satBaMV 3' untranslated region (UTR) binding proteins associated with these replicase complexes. Two cellular proteins with molecular masses of ∼35 and ∼55 kDa were specifically cross-linked with RNA elements, whereupon the ∼35-kDa protein was identified as the glycolytic enzyme glyceraldehyde 3-phosphate dehydrogenase (GAPDH). Gel mobility shift assays confirmed the direct interaction of GAPDH with the 3' UTR sequences, and competition gel shift analysis revealed that GAPDH binds preferentially to the positive-strand BaMV and satBaMV RNAs over the negative-strand RNAs. It was observed that the GAPDH protein binds to the pseudoknot poly(A) tail of BaMV and stem-loop-C poly(A) tail of satBaMV 3' UTR RNAs. It is important to note that knockdown of GAPDH in Nicotiana benthamiana enhances the accumulation of BaMV and satBaMV RNA; conversely, transient overexpression of GAPDH reduces the accumulation of BaMV and satBaMV RNA. The recombinant GAPDH principally inhibits the synthesis of negative-strand RNA in exogenous RdRp assays. These observations support the contention that cytosolic GAPDH participates in the negative regulation of BaMV and satBaMV RNA replication.
Collapse
|
81
|
Liu KC, Huang AC, Wu PP, Lin HY, Chueh FS, Yang JS, Lu CC, Chiang JH, Meng M, Chung JG. Gallic acid suppresses the migration and invasion of PC-3 human prostate cancer cells via inhibition of matrix metalloproteinase-2 and -9 signaling pathways. Oncol Rep 2011; 26:177-84. [PMID: 21503582 DOI: 10.3892/or.2011.1264] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Accepted: 03/15/2011] [Indexed: 11/06/2022] Open
Abstract
Epidemiological studies have demonstrated that a natural diet or consumption of fruits or vegetables can decrease the risk of cancer development. Cancer cells can migrate to and invade other organs or tissues that cause more difficulty to treat them and this also results in the need for treatments targeting multiple cellular pathways. Gallic acid (GA) has been demonstrated to possess multiple biological activities including anticancer function. However, no report exist on GA inhibited invasion and migration of human prostate cancer cells. We investigated the effects of migration and invasion in GA-treated PC-3 human prostate cancer cells with a series of in vitro experiments. Boyden chamber transwell assay was used to examine the migration and invasion of PC-3 cells. Western blotting, real-time PCR and gelatin zymography were used for determining the protein levels, gene expression and enzyme activities of matrix metalloproteinase-2 (MMP-2) and -9 in vitro. Results indicated that GA inhibited the invasion and migration of PC-3 cells and these effects are dose-dependent. GA inhibited the protein levels of MMP-2 and -9, son of sevenless homolog 1 (SOS1), growth factor receptor-bound protein 2 (GRB2), protein kinase C (PKC) and nuclear factor-κ B (NF-κB) p65, c-Jun N-terminal kinase (JNK), extracellular signal-regulated kinase 1/2 (ERK1/2), p38, p-AKT (Thr308) and p-AKT (Ser473), but it promoted the levels of phosphatidylinositol 3-kinase (PI3K) and AKT in PC-3 cells. GA also reduced the enzyme activities of MMP-2 and -9 in the examined cells. Moreover, the down-regulation of focal adhesion kinase (FAK) and Ras homolog gene family, member A (Rho A) mRNA expression levels, and up-regulation of the tissue inhibitor of metalloproteinase-1 (TIMP1) gene levels occurred in GA-treated PC-3 cells after 24 h treatment. Based on these observations, we suggest that GA might modulate through blocking the p38, JNK, PKC and PI3K/AKT signaling pathways and reducing the NF-κB protein level, resulting in the inhibition of MMP-2 and -9 of PC-3 human prostate cancer cells.
Collapse
|
82
|
Meng M, Yu L, Yao T, Sheng R, Hu Y, Zeng S. Development of a UPLC-MS-MS Method for Quantitative Determination of BYYT-25 in Rat Plasma and Its Application to a Pharmacokinetic Study. J Chromatogr Sci 2011. [DOI: 10.1093/chrsci/49.3.255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
83
|
Hu RH, Lin MC, Hsu YH, Meng M. Mutational effects of the consensus aromatic residues in the mRNA capping domain of Bamboo mosaic virus on GTP methylation and virus accumulation. Virology 2011; 411:15-24. [PMID: 21227477 DOI: 10.1016/j.virol.2010.12.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Revised: 10/29/2010] [Accepted: 12/14/2010] [Indexed: 10/18/2022]
Abstract
RNA viruses classified in the alphavirus-like superfamily possess a distinct capping domain, catalyzing GTP methylation and subsequent transfer of the m(7)GMP moiety from m(7)GTP to the 5'-diphosphate end of viral RNA. The H68A mutation in the capping domain of Bamboo mosaic virus enhanced GTP methylation but disabled the following transguanylation, making it possible to characterize the enzyme's methyltransferase activity separately. To explore the involvement of aromatic amino acids in substrate recognition, consensus aromatic residues in the viral domain were subjected to mutational analysis in the background of H68A. Several residues, including Y126, F144, F161, Y192, Y203, Y213, and W222, were found to be critical for GTP methylation and S-adenosylmethionine (AdoMet) binding. These mutations, except for Y213, also adversely affected the GTP binding, but less extensively. In general, the mutations decreasing the activity for GTP methylation also had correspondingly detrimental effects on virus accumulation.
Collapse
|
84
|
Ostrovsky Y, Moulson M, Meng M, Choi K, Gandhi T, Sinha P. Haptic and visual defragmentation of shapes. J Vis 2010. [DOI: 10.1167/9.8.896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
85
|
Gorlin S, Meng M, Sharma J, Sugihara H, Sur M, Sinha P. Decoding top-down information: Imaging prior knowledge in the visual system. J Vis 2010. [DOI: 10.1167/9.8.783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
86
|
Sha L, Meng M. The timing of categorical face perception. J Vis 2010. [DOI: 10.1167/10.7.676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
87
|
Pallett P, Meng M. Contrast-Negation Impairs Gender but Not Emotion Discrimination. J Vis 2010. [DOI: 10.1167/10.7.603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
88
|
Meng M, Cherian T, Singal G, Sinha P. Functional lateralization of face processing. J Vis 2010. [DOI: 10.1167/10.7.562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
89
|
Meng M, Singal G, Cherian T, Sinha P. Neural correlates of categorical face perception. J Vis 2010. [DOI: 10.1167/8.6.407] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
90
|
Meng M, Cherian T, Sinha P. Neural basis of contextual modulation on categorical face perception. J Vis 2010. [DOI: 10.1167/9.8.456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
91
|
Meng M, Potter MC. Amodal completion when perceiving and remembering RSVP pictures. J Vis 2010. [DOI: 10.1167/6.6.467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
92
|
Ferneyhough E, Meng M, Tong F. Interactions between binocular rivalry and perceptual filling-in of visual phantoms. J Vis 2010. [DOI: 10.1167/6.6.45] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
93
|
Meng M, Remus DA, Tong F. Effects of perceptual grouping in human primary visual cortex. J Vis 2010. [DOI: 10.1167/3.9.755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
94
|
Meng M, Cherian T, Gabrieli S, Gabrieli J, Sinha P. Using computer vision to probe the neural correlates of categorical face perception. J Vis 2010. [DOI: 10.1167/7.9.126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
95
|
Meng M, Tong F. Binocular rivalry can fully gate the formation of visual phantoms. J Vis 2010. [DOI: 10.1167/5.8.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
96
|
Tong F, Wong A, Meng M, McKeeff TJ. Brain areas involved in attentional control and perception of ambiguous figures. J Vis 2010. [DOI: 10.1167/2.7.677] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
97
|
Rubin N, Hupe JM, Meng M, Tong F. Stimulus strength and dominance duration in perceptual bi-stability. Part I: the unperceived stimulus affects the very first dominance epoch. J Vis 2010. [DOI: 10.1167/2.7.461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
98
|
Meng M, Tong F. Can attention bias bistable perception? Differences between rivalry and ambiguous figures. J Vis 2010. [DOI: 10.1167/2.7.447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
99
|
Chen IH, Lin JW, Chen YJ, Wang ZC, Liang LF, Meng M, Hsu YH, Tsai CH. The 3'-terminal sequence of Bamboo mosaic virus minus-strand RNA interacts with RNA-dependent RNA polymerase and initiates plus-strand RNA synthesis. MOLECULAR PLANT PATHOLOGY 2010; 11:203-12. [PMID: 20447270 PMCID: PMC6640325 DOI: 10.1111/j.1364-3703.2009.00597.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
A 3'-terminal, 77-nucleotide sequence of Bamboo mosaic virus (BaMV) minus-strand RNA (Ba-77), comprising a 5' stem-loop, a spacer and a 3'-CUUUU sequence, can be used to initiate plus-strand RNA synthesis in vitro. To understand the mechanism of plus-strand RNA synthesis, mutations were introduced in the 5' untranslated region of BaMV RNA, resulting in changes at the 3' end of minus-strand RNA. The results showed that at least three uridylate residues in 3'-CUUUU are required and the changes at the penultimate U are deleterious to viral accumulation in Nicotiana benthamiana protoplasts. Results from UV-crosslinking and in vitro RNA-dependent RNA polymerase competition assays suggested that the replicase preferentially interacts with the stem structure of Ba-77. Finally, CMV/83 + UUUUC, a heterologus RNA, which possesses about 80 nucleotides containing the 3'-CUUUU pentamer terminus, and which folds into a secondary structure similar to that of Ba-77, could be used as template for RNA production by the BaMV replicase complex in vitro.
Collapse
|
100
|
Cheng YM, Hsieh FC, Meng M. Functional analysis of conserved aromatic amino acids in the discoidin domain of Paenibacillus beta-1,3-glucanase. Microb Cell Fact 2009; 8:62. [PMID: 19930717 PMCID: PMC2789033 DOI: 10.1186/1475-2859-8-62] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2009] [Accepted: 11/25/2009] [Indexed: 02/01/2023] Open
Abstract
The 190-kDa Paenibacillus beta-1,3-glucanase (LamA) contains a catalytic module of the glycoside hydrolase family 16 (GH16) and several auxiliary domains. Of these, a discoidin domain (DS domain), present in both eukaryotic and prokaryotic proteins with a wide variety of functions, exists at the carboxyl-terminus. To better understand the bacterial DS domain in terms of its structure and function, this domain alone was expressed in Escherichia coli and characterized. The results indicate that the DS domain binds various polysaccharides and enhances the biological activity of the GH16 module on composite substrates. We also investigated the importance of several conserved aromatic residues in the domain's stability and substrate-binding affinity. Both were affected by mutations of these residues; however, the effect on protein stability was more notable. In particular, the forces contributed by a sandwiched triad (W1688, R1756, and W1729) were critical for the presumable beta-sandwich fold.
Collapse
|