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https://www.readbyqxmd.com/read/29787767/influence-of-gag-and-rre-sequences-on-hiv-1-rna-packaging-signal-structure-and-function
#1
Siarhei Kharytonchyk, Joshua D Brown, Krista Stilger, Saif Yasin, Aishwarya S Iyer, John Collins, Michael F Summers, Alice Telesnitsky
The packaging signal (Ψ) and Rev. responsive element (RRE), enable unspliced HIV-1 RNAs' export from the nucleus and packaging into virions. For some retroviruses, engrafting Ψ onto a heterologous RNA is sufficient to direct encapsidation. In contrast, HIV-1 RNA packaging requires 5' leader Ψ elements plus poorly defined additional features. We previously defined minimal 5' leader sequences competitive with intact Ψ for HIV-1 packaging, and here examined the potential roles of additional downstream elements...
May 19, 2018: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29786452/identification-of-a-novel-hiv-1-unique-recombinant-form-composed-of-crf01_ae-subtype-b-and-crf65_cpx-among-men-who-have-sex-with-men-in-jilin-china
#2
Yuan-Long Lin, Bo Song, Bing Shao, Si-Yu Liu, Qing-Qing Huo, Jin Li, Jia-Ye Wang, Fu-Xiang Wang
Current HIV-1 epidemic in China is featured by diverse subtypes and continual emergence of new recombinant viruses. This study identified a novel unique recombinant form (URF) JL16013 among men who has sex with men (MSM) in Jilin, China. The JL16013 virus was different from all known subtypes and set up a distinct branch on the phylogenetic tree. This virus had a CRF01_AE backbone with two subtype B' fragments and one CRF65_cpx fragment inserted into gag, pol, env and nef regions, suggesting that this novel URF might originated from the CRF01_AE, subtype B' and CRF65_cpx viruses that were co-circulating in Jilin province...
May 22, 2018: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/29780384/discrimination-between-human-leukocyte-antigen-class-i-bound-and-co-purified-hiv-derived-peptides-in-immunopeptidomics-workflows
#3
Thomas Partridge, Annalisa Nicastri, Anna E Kliszczak, Louis-Marie Yindom, Benedikt M Kessler, Nicola Ternette, Persephone Borrow
Elucidation of novel peptides presented by human leukocyte antigen (HLA) class I alleles by immunopeptidomics constitutes a powerful approach that can inform the rational design of CD8+ T cell inducing vaccines to control infection with pathogens such as human immunodeficiency virus type 1 (HIV-1) or to combat tumors. Recent advances in the sensitivity of liquid chromatography tandem mass spectrometry instrumentation have facilitated the discovery of thousands of natural HLA-restricted peptides in a single measurement...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29773649/ptap-motif-duplication-in-the-p6-gag-protein-confers-a-replication-advantage-on-hiv-1-subtype-c
#4
Shilpee Sharma, Prabhu S Arunachalam, Malini Menon, Viswanath Ragupathy, Ravi Vijaya Satya, Joshua Jebaraj, Shambhu Ganeshappa Aralaguppe, Chaitra Rao, Sreshtha Pal, Shanmugam Saravanan, Kailapuri G Murugavel, Pachamuthu Balakrishnan, Suniti Solomon, Indira Hewlett, Udaykumar Ranga
HIV-1 subtype C (HIV-1C) may duplicate longer amino acid stretches in the p6 Gag protein, leading to the creation of an additional Pro-Thr/Ser-Ala-Pro (PTAP) motif necessary for viral packaging. However, the biological significance of a duplication of the PTAP motif for HIV-1 replication and pathogenesis has not been experimentally validated. In a longitudinal study of two different clinical cohorts of select HIV-1 seropositive, drug-naive individuals from India, we found that 8 of 50 of these individuals harbored a mixed infection of viral strains discordant for the PTAP duplication...
May 17, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29773224/early-env-specific-ctls-effectively-suppress-viral-replication-in-shiv-controller-macaques
#5
Jin Fan, Hua Liang, Tao Shen, Shuo Wang, Xiaolin Ji, Cassian Yee, Fengmin Lu, Yiming Shao
Early immunological events in acute HIV infection are thought to fundamentally influence long-term disease outcomes. Though the contribution of Gag-specific CD8 T cell responses to early viral control is well established, little is known about the role of Env-specific CD8 T cell responses in controlling viral replication during acute infection. In a macaque simian-human immunodeficiency virus (SHIV) model, some macaques who were able to control SHIV replication after ART interruption showed expansion of Env-specific CD8 T cell responses during acute infection, compared to macaques who progressed to viral rebound...
May 5, 2018: Cellular Immunology
https://www.readbyqxmd.com/read/29772651/properties-and-functions-of-feline-immunodeficiency-virus-gag-domains-in-virion-assembly-and-budding
#6
REVIEW
Silvia A González, José L Affranchino
Feline immunodeficiency virus (FIV) is an important cat pathogen worldwide whose biological and pathophysiological properties resemble those of human immunodeficiency virus type 1 (HIV-1). Therefore, the study of FIV not only benefits its natural host but is also useful for the development of antiviral strategies directed against HIV-1 infections in humans. FIV assembly results from the multimerization of a single but complex viral polypeptide, the Gag precursor. In this review, we will first give an overview of the current knowledge of the proteins encoded by the FIV pol , env , rev , vif, and orf-A genes, and then we will describe and discuss in detail the critical roles that each of the FIV Gag domains plays in virion morphogenesis...
May 16, 2018: Viruses
https://www.readbyqxmd.com/read/29760693/treatment-intensification-in-hiv-infected-patients-is-associated-with-reduced-frequencies-of-regulatory-t-cells
#7
Eva M Grützner, Tanja Hoffmann, Eva Wolf, Elke Gersbacher, Ashley Neizert, Renate Stirner, Ramona Pauli, Albrecht Ulmer, Jürgen Brust, Johannes R Bogner, Hans Jaeger, Rika Draenert
In untreated HIV infection, the efficacy of T cell responses decreases over the disease course, resulting in disease progression. The reasons for this development are not completely understood. However, immunosuppressive cells are supposedly crucially involved. Treatment strategies to avoid the induction of these cells preserve immune functions and are therefore the object of intense research efforts. In this study, we assessed the effect of treatment intensification [=5-drug antiretroviral therapy (ART)] on the development of suppressive cell subsets...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29752967/hiv-1-matrix-protein-interactions-with-trna-implications-for-membrane-targeting
#8
Christy R Gaines, Emre Tkacik, Amalia Rivera-Oven, Phoebe Somani, Alecia Achimovich, Tawakalitou Alabi, Angela Zhu, Noel Getachew, Ae Lim Yang, Matthew McDonough, Tarik Hawkins, Zoe Spadaro, Michael F Summers
The N-terminally myristoylated matrix domain (MA) of the HIV-1 Gag polyprotein promotes virus assembly by targeting Gag to the inner leaflet of the plasma membrane (PM). Recent studies indicate that, prior to membrane binding, MA associates with cytoplasmic tRNAs (including tRNALys3 ), and in vitro studies of tRNA-dependent MA interactions with model membranes have led to proposals that competitive tRNA interactions contribute to membrane discrimination. We have characterized interactions between native, mutant, and unmyristylated (myr-) MA proteins and recombinant tRNALys3 by NMR spectroscopy and isothermal titration calorimetry (ITC)...
May 9, 2018: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29748537/single-molecule-fate-of-hiv-1-envelope-reveals-late-stage-viral-lattice-incorporation
#9
Carmen A Buttler, Nairi Pezeshkian, Melissa V Fernandez, Jesse Aaron, Sofya Norman, Eric O Freed, Schuyler B van Engelenburg
Human immunodeficiency virus type 1 (HIV-1) assembly occurs on the inner leaflet of the host cell plasma membrane, incorporating the essential viral envelope glycoprotein (Env) within a budding lattice of HIV-1 Gag structural proteins. The mechanism by which Env incorporates into viral particles remains poorly understood. To determine the mechanism of recruitment of Env to assembly sites, we interrogate the subviral angular distribution of Env on cell-associated virus using multicolor, three-dimensional (3D) superresolution microscopy...
May 10, 2018: Nature Communications
https://www.readbyqxmd.com/read/29748498/single-viruses-on-the-fluorescence-microscope-imaging-molecular-mobility-interactions-and-structure-sheds-new-light-on-viral-replication
#10
REVIEW
Nagma Parveen, Doortje Borrenberghs, Susana Rocha, Jelle Hendrix
Viruses are simple agents exhibiting complex reproductive mechanisms. Decades of research have provided crucial basic insights, antiviral medication and moderately successful gene therapy trials. The most infectious viral particle is, however, not always the most abundant one in a population, questioning the utility of classic ensemble-averaging virology. Indeed, viral replication is often not particularly efficient, prone to errors or containing parallel routes. Here, we review different single-molecule sensitive fluorescence methods that we employ routinely to investigate viruses...
May 10, 2018: Viruses
https://www.readbyqxmd.com/read/29743369/intrastructural-help-harnessing-t-helper-cells-induced-by-licensed-vaccines-for-improvement-of-hiv-env-antibody-responses-to-virus-like-particle-vaccines
#11
Hassan Elsayed, Ghulam Nabi, William J McKinstry, Keith K Khoo, Johnson Mak, Andres M Salazar, Matthias Tenbusch, Vladimir Temchura, Klaus Überla
Induction of persistent antibody responses by vaccination is generally thought to depend on efficient help by T follicular helper cells. Since the T helper cell response to HIV Env may not be optimal, we explored the possibility to improve the HIV Env antibody response to virus-like particle (VLP) vaccines by recruiting T helper cells induced by a commonly-used licensed vaccines to provide help for Env-specific B cells. B cells specific for the surface protein of a VLP can internalize the entire VLP and thus present peptides derived from the surface and core proteins on their MHC-II molecules...
May 9, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29739909/a-high-frequency-of-hiv-specific-circulating-follicular-helper-t-cells-is-associated-with-preserved-memory-b-cell-responses-in-hiv-controllers
#12
M Claireaux, M Galperin, D Benati, A Nouël, M Mukhopadhyay, J Klingler, P de Truchis, D Zucman, S Hendou, F Boufassa, C Moog, O Lambotte, L A Chakrabarti
Follicular helper T cells (Tfh) play an essential role in the affinity maturation of the antibody response by providing help to B cells. To determine whether this CD4+ T cell subset may contribute to the spontaneous control of HIV infection, we analyzed the phenotype and function of circulating Tfh (cTfh) in patients from the ANRS CO21 CODEX cohort who naturally controlled HIV-1 replication to undetectable levels and compared them to treated patients with similarly low viral loads. HIV-specific cTfh (Tet+ ), detected by Gag-major histocompatibility complex class II (MHC-II) tetramer labeling in the CD45RA- CXCR5+ CD4+ T cell population, proved more frequent in the controller group ( P = 0...
May 8, 2018: MBio
https://www.readbyqxmd.com/read/29739342/high-prevalence-of-hiv-1-transmitted-drug-resistance-among-therapy-na%C3%A3-ve-burmese-entering-travelers-at-dehong-ports-in-yunnan-china
#13
Qicai Xuan, Shuwen Liang, Weihong Qin, Shuting Yang, A-Mei Zhang, Ting Zhao, Hui Su, Zhiqing Xia, Binghui Wang, Xueshan Xia
BACKGROUND: The overall success of Human immunodeficiency virus type 1 (HIV-1) antiretroviral therapy (ART) was heavily challenged upon the occurrence of drug resistance. Dehong Prefecture witnessed not only the first report of HIV-1 infection but also the experimental adoption of antiviral treatment in China. The transmission and epidemic of HIV-1 in Dehong is impacted by cross-border activities. The characteristics of HIV-1 drug resistance among therapy-naïve Burmese entering travelers in Yunnan and their speculated origin are still not clarified...
May 8, 2018: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29737194/characterization-of-cellular-immune-responses-in-thai-individuals-with-and-without-hiv-associated-neurocognitive-disorders
#14
Silvia Ratto-Kim, Alexandra Schuetz, Pasiri Sithinamsuwan, John Barber, Nicholas Hutchings, Sukalaya Lerdlum, James L K Fletcher, Yuwadee Phuang-Ngern, Weerawan Chuenarom, Somporn Tipsuk, Mantana Pothisri, Tanate Jadwattanakul, Supunnee Jirajariyavej, Chayada Sajjaweerawan, Siriwat Akapirat, Thep Chalermchai, Duanghathai Suttichom, Boot Keawboon, Peeriya Prueksakaew, Putthachard Karnsomlap, David Clifford, Robert H Paul, Mark de Souza, Jerome H Kim, Jintinant Anaworanich, Victor Valcour
HIV-associated cognitive disorder (HAND) remains a challenge despite antiretroviral therapy (ART), and has been linked to monocyte/macrophage (M/M) migration to the brain. Due to the potential impact of T cell effector mechanisms in eliminating activated/HIV-infected M/M, T cell activation may play a role in the development of HAND. We sought to investigate the relationship between cognition and both CD8+ T-cell activation (HLA-DR+/CD38+) and HIV-specific CD8+ T-cell responses at the time of HIV diagnosis and 12 months post initiation of ART...
May 8, 2018: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/29734365/nod2-is-required-for-antigen-specific-humoral-responses-against-antigens-orally-delivered-using-a-recombinant-lactobacillus-vaccine-platform
#15
Sara A Bumgardner, Lin Zhang, Alora S LaVoy, Barbara Andre, Chad B Frank, Akinobu Kajikawa, Todd R Klaenhammer, Gregg A Dean
Safe and efficacious orally-delivered mucosal vaccine platforms are desperately needed to combat the plethora of mucosally transmitted pathogens. Lactobacillus spp. have emerged as attractive candidates to meet this need and are known to activate the host innate immune response in a species- and strain-specific manner. For selected bacterial isolates and mutants, we investigated the role of key innate immune pathways required for induction of innate and subsequent adaptive immune responses. Co-culture of murine macrophages with L...
2018: PloS One
https://www.readbyqxmd.com/read/29732988/appearance-of-drug-resistance-mutations-among-the-dominant-hiv-1-subtype-crf01_ae-in-maumere-indonesia
#16
Dwi Wahyu Indriati, Tomohiro Kotaki, Siti Qamariyah Khairunisa, Adiana Mutamsari Witaningrum, Muhammad Qushai Yunifiar Matondang, Shuhei Ueda, Nasronudin, Asep Purnama, Dwi Kurniawan, Masanori Kameoka
BACKGROUND AND OBJECTIVES: Human Immunodeficiency Virus (HIV) is still a major health issue in Indonesia. In recent years, the appearance of drug resistance-associated mutations has reduced the effectiveness of antiretroviral therapy (ART). We conducted genotypic studies, including the detection of drug resistance-associated mutations (from first-line regimen drugs), on HIV-1 genes derived from infected individuals in Maumere, West Nusa Tenggara. Maumere, a transit city in West Nusa Tenggara, which has a high HIV-1 transmission rate...
May 1, 2018: Current HIV Research
https://www.readbyqxmd.com/read/29727193/myristoylation-and-oligonucleotide-interaction-modulate-peptide-and-protein-surface-properties-the-case-of-the-hiv-1-matrix-domain
#17
Luis B P Socas, Ernesto Ambroggio
Myristoylated proteins typically develop a tight association with membranes. One example is the matrix domain (MA) of the HIV-1 Gag protein. In addition, MA is able to bind the Sel25 RNA sequence, a ligand that can act as competitor for the interaction with the membrane. These properties make HIV-1 MA an attractive molecule to understand how protein and peptide surface properties can be controlled by myristoylation and oligonucleotide interaction. In this line, we analyzed the stability, thermodynamics and the topography of Langmuir monolayers composed of the myristoylated or unmyristoylated versions of MA in the presence or the absence of a single strand DNA (ssDNASel25) analog of the Sel25 RNA sequence...
May 4, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29724686/hiv-specific-t-cells-generated-from-naive-t-cells-suppress-hiv-in-vitro-and-recognize-wide-epitope-breadths
#18
Shabnum Patel, Elizabeth Chorvinsky, Shuroug Albihani, Conrad Russell Cruz, R Brad Jones, Elizabeth J Shpall, David M Margolis, Richard F Ambinder, Catherine M Bollard
The Berlin Patient represents the first and only functional HIV cure achieved by hematopoietic stem cell transplant (HSCT). In subsequent efforts to replicate this result, HIV rebounded post-HSCT after withdrawal of antiretroviral therapy. Providing HIV-specific immunity through adoptive T cell therapy may prevent HIV rebound post-HSCT by eliminating newly infected cells before they can seed systemic infection. Adoptive T cell therapy has demonstrated success in boosting Epstein-Barr virus and cytomegalovirus-specific immunity post-HSCT, controlling viral reactivation...
April 12, 2018: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/29724117/characterization-of-a-new-hiv-1-crf01_ae-crf07_bc-recombinant-virus-in-tianjin-china
#19
Zhehua Zhou, Ping Ma, Yi Feng, Weidong Ou, Jing Qian, Liying Gao, Defa Zhang, Yiming Shao, Min Wei
Human immunodeficiency virus (HIV) is notorious for its rapid evolving since its transmissions from money to human. Currently, HIV contains multiple subtypes, circulating recombinant forms (CRFs) and unique recombinant forms (URFs). Here, from an HIV-positive mother and her child in Tianjin, China, we identified a novel HIV-1 second-generation recombinant virus (TJ20170316 and TJ20170317) between CRF01_AE and CRF07_BC. Near full-length genomes were obtained from both samples, and they shared very close sequences, except some point mutations...
May 4, 2018: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/29724116/identification-of-a-novel-hiv-1-b-c-crf01_ae-recombinant-isolate-in-guangxi-china
#20
Chen Wang, Yan Wang, Desheng Kong, Shujia Liang, Yi Feng, Liying Ma
Continual generation of HIV-1 recombinant forms might contribute to its genetic diversity. In this study, a novel B/C/CRF01_AE recombinant virus (GX2016EU13) was identified, which was isolated from a HIV-positive man who infected through heterosexual sex in Guangxi, China. GX2016EU13 was identified as CCR5-tropic. As shown in the near full-length genome analyses, five recombinant breakpoints were found only in the pol gene of GX2016EU13, which divided the NFLG into three subtype B segments, two subtype C segments and one CRF01_AE segment...
May 4, 2018: AIDS Research and Human Retroviruses
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