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membrane protein folding

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https://www.readbyqxmd.com/read/28212887/erratum-to-toxoplasma-gondii-immune-mapped-protein-1-is-anchored-to-the-inner-leaflet-of-the-plasma-membrane-and-adopts-a-novel-protein-fold-biochim-biophys-acta-protein-proteomics-1865-2-2017-208-219
#1
Yonggen Jia, Stefi Benjamin, Qun Liu, Yingqi Xu, Sunil Kumar Dogga, Jing Liu, Stephen Matthews, Dominique Soldati-Favre
No abstract text is available yet for this article.
February 15, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28212487/interactions-between-membranes-and-metaphilic-polypeptide-architectures-with-diverse-sidechain-populations
#2
Michelle W Lee, Ming Han, Guilherme Volpe Bossa, Carly Snell, Ziyuan Song, Haoyu Tang, Lichen Yin, Jianjun Cheng, Sylvio May, Erik Luijten, Gerard C L Wong
At physiological conditions, most proteins or peptides can fold into relatively stable structures that present on their molecular surfaces specific chemical patterns partially smeared out by thermal fluctuations. These nanoscopically defined patterns of charge, hydrogen bonding, and/or hydrophobicity, along with their elasticity and shape stability (folded proteins have Young's moduli of ~1 × 10(8) Pa), largely determine and limit the interactions of these molecules, such as molecular recognition and allosteric regulation...
February 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28209491/the-preterm-cervix-reveals-a-transcriptomic-signature-in-the-presence-of-premature-pre-labor-rupture-of-membranes
#3
Sofia Makieva, Aurelija Dubicke, Sara F Rinaldi, Emma Fransson, Gunvor Ekman-Ordeberg, Jane E Norman
BACKGROUND: Premature Pre-labor Rupture of Fetal Membranes (PPROM) accounts for 30% of all premature births and is associated with detrimental long-term infant outcomes. Premature cervical remodeling, facilitated by matrix metalloproteinases (MMPs), may trigger rupture at the zone of the fetal membranes overlying the cervix. The similarities and differences underlying cervical remodeling in PPROM and spontaneous preterm labor with intact membranes (PTL) are unexplored. OBJECTIVES: We aimed a) to perform the first transcriptomic assessment of the preterm human cervix to identify differences between PPROM and PTL and b) to compare the enzymatic activities of MMP-2 and 9 between PPROM and PTL...
February 13, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28209374/design-synthesis-and-evaluation-of-novel-pyrazolo-pyrimido-4-5-d-pyrimidine-derivatives-as-potent-antibacterial-and-biofilm-inhibitors
#4
Lingala Suresh, P Sagar Vijay Kumar, Y Poornachandra, C Ganesh Kumar, G V P Chandramouli
An efficient four-component reaction of 6-amino-1,3-dimethyluracil, N,N-dimethylformamide dimethylacetal, 1-phenyl-3-(4-substituted-phenyl)-4-formyl-1H-pyrazoles and aromatic amines was conducted in the presence of [Bmim]FeCl4 ionic liquid as a promoting medium. This strategy provided a convenient route without any additional catalyst or metal salt under mild conditions. All the synthesized pyrazolo-pyrimido[4,5-d]pyrimidines derivatives were evaluated for their antibacterial, minimum bactericidal concentration (MBC), biofilm inhibition, intracellular ROS accumulation and protein leakage activities...
February 3, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28209172/evaluation-of-the-contribution-of-the-transmembrane-region-to-the-ectodomain-conformation-of-the-human-immunodeficiency-virus-hiv-1-envelope-glycoprotein
#5
Hanh T Nguyen, Navid Madani, Haitao Ding, Emerald Elder, Amy Princiotto, Christopher Gu, Patrice Darby, James Alin, Alon Herschhorn, John C Kappes, Youdong Mao, Joseph G Sodroski
BACKGROUND: The human immunodeficiency virus (HIV-1) envelope glycoprotein (Env), a Type 1 transmembrane protein, assembles into a trimeric spike complex that mediates virus entry into host cells. The high potential energy of the metastable, unliganded Env trimer is maintained by multiple non-covalent contacts among the gp120 exterior and gp41 transmembrane Env subunits. Structural studies suggest that the gp41 transmembrane region forms a left-handed coiled coil that contributes to the Env trimer interprotomer contacts...
February 16, 2017: Virology Journal
https://www.readbyqxmd.com/read/28208663/endoplasmic-reticulum-er-stress-and-endocrine-disorders
#6
REVIEW
Daisuke Ariyasu, Hiderou Yoshida, Yukihiro Hasegawa
The endoplasmic reticulum (ER) is the organelle where secretory and membrane proteins are synthesized and folded. Unfolded proteins that are retained within the ER can cause ER stress. Eukaryotic cells have a defense system called the "unfolded protein response" (UPR), which protects cells from ER stress. Cells undergo apoptosis when ER stress exceeds the capacity of the UPR, which has been revealed to cause human diseases. Although neurodegenerative diseases are well-known ER stress-related diseases, it has been discovered that endocrine diseases are also related to ER stress...
February 11, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28207776/the-improved-efficacy-of-sifuvirtide-compared-with-enfuvirtide-might-be-related-to-its-selectivity-for-the-rigid-biomembrane-as-determined-through-surface-plasmon-resonance
#7
Ping Cao, Guifang Dou, Yuanguo Cheng, Jinjing Che
Most mechanistic studies on human immunodeficiency virus (HIV) peptide fusion inhibitors have focused on the interactions between fusion inhibitors and viral envelope proteins. However, the interactions of fusion inhibitors with viral membranes are also essential for the efficacy of these drugs. Here, we utilized surface plasmon resonance (SPR) technology to study the interactions between the HIV fusion inhibitor peptides sifuvirtide and enfuvirtide and biomembrane models. Sifuvirtide presented selectivity toward biomembrane models composed of saturated dipalmitoylphosphatidylcholine (DPPC) (32-fold higher compared with unsaturated 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine [POPC]) and sphingomyelin (SM) (31-fold higher compared with POPC), which are rigid compositions enriched in the HIV viral membrane...
2017: PloS One
https://www.readbyqxmd.com/read/28206710/sucrose-transporter2-contributes-to-maize-growth-development-and-crop-yield
#8
Kristen A Leach, Thu M Tran, Thomas L Slewinski, Robert B Meeley, David M Braun
During daylight, plants produce excess photosynthates, including sucrose, which is temporarily stored in the vacuole. At night, plants remobilize sucrose to sustain metabolism and growth. Based on homology to other sucrose transporter (SUT) proteins, we hypothesized the maize (Zea mays) SUCROSE TRANSPORTER2 (ZmSUT2) protein functions as a sucrose/H(+) symporter on the vacuolar membrane to export transiently stored sucrose. To understand the biological role of ZmSut2, we examined its spatial and temporal gene expression, determined the protein subcellular localization, and characterized loss-of-function mutations...
February 16, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28199899/role-of-outer-membrane-protein-t-in-pathogenicity-of-avian-pathogenic-escherichia-coli
#9
Hassan M A Hejair, Jiale Ma, Yingchu Zhu, Min Sun, Wenyang Dong, Yue Zhang, Zihao Pan, Wei Zhang, Huochun Yao
An outer membrane protein T (OmpT) could play a vital role in the pathogenesis of the neonatal meningitis Escherichia coli (NMEC) in human and animals. However, whether ompT plays a role in avian pathogenic E. coli (APEC) infection remains unclear. In this study we evaluated the potential of ompT in APEC pathogenesis. An ompT gene was deleted from APEC mutant strain (TW-XM) was constructed and characterized. The inactivation of ompT reduced significantly the adherence and invasion capabilities of APEC to mouse brain microvascular endothelial cell (BMEC) bEnd...
January 27, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28196861/molecular-determinants-of-the-n-terminal-acetyltransferase-naa60-anchoring-to-the-golgi-membrane
#10
Henriette Aksnes, Marianne Goris, Øyvind Strømland, Adrian Drazic, Qaiser Waheed, Nathalie Reuter, Thomas Arnesen
Nα-acetyltransferase 60 (Naa60 or NatF) was recently identified as an unconventional N-terminal acetyltransferase (NAT) since it localizes to organelles, in particular the Golgi apparatus, and has a preference for acetylating N-termini of transmembrane proteins. This knowledge challenged the prevailing view of N-terminal acetylation as a co-translational ribosome-associated process and suggested a new mechanistic functioning for the enzymes responsible for this increasingly recognized protein modification...
February 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28193053/construction-of-an-in-vitro-gene-screening-system-of-the-e-coli-emre-transporter-using-liposome-display
#11
Atsuko Uyeda, Shintaro Nakayama, Yasuhiko Kato, Hajime Watanabe, Tomoaki Matsuura
Liposome display is a method that enables the directed evolution of membrane proteins in vitro. The method is based on the syntheses of membrane proteins using an in vitro transcription-translation system (IVTT) inside cell-sized phospholipid vesicles from a single copy of template DNA. So far, a large number of membrane proteins have been synthesized by IVTT; however, none of these proteins, except for α-hemolysin, has been tested for use in gene screening with liposome display. Here, using EmrE, a multidrug transporter from Escherichia coli,, as a model protein, we developed an in vitro screening system of the transporter gene based on its function, which was made possible by using liposome display...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28192938/size-dependent-lipidomic-analysis-of-urinary-exosomes-from-patients-with-prostate-cancer-by-flow-field-flow-fractionation-and-nanoflow-liquid-chromatography-tandem-mass-spectrometry
#12
Joon Seon Yang, Jong Cheol Lee, Seul Kee Byeon, Koon Ho Rha, Myeong Hee Moon
Exosomes are membrane-bound extracellular vesicles involved in intercellular communication and tumor cell metastasis. In this study, flow field-flow fractionation (FlFFF) was utilized to separate urinary exosomes by size, demonstrating a significant difference in exosome sizes between healthy controls and patients with prostate cancer (PCa). Exosome fractions of different sizes were collected for microscopic analysis during an FlFFF run and evaluated with exosome marker proteins using Western blot analysis...
February 2, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28190398/transforming-cytosolic-proteins-into-insoluble-and-membrane-toxic-forms-by-genetic-pathological-or-environmental-factors
#13
Jianxing Song
An increasing spectrum of diseases other than neurodegenerative diseases is characteristic of aggregation of specific proteins, while aggregation of a large number of non-specific proteins are associated with aging down to Escherichia coli. Triggered by disease-causing mutations and aging-associated damages, many well-folded cytosolic proteins become "completely insoluble" in vivo. As facilitated by our discovery in 2005 that "completely insoluble" proteins could be solubilized in unsalted water, we have deciphered that disease- and aging-associated factors act to eliminate the native folds of human VAPB-MSP and SOD1, as well as E...
February 9, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28188302/vesicular-acetylcholine-transporter-defect-underlies-devastating-congenital-myasthenia-syndrome
#14
Adi Aran, Reeval Segel, Kota Kaneshige, Suleyman Gulsuner, Paul Renbaum, Scott Oliphant, Tomer Meirson, Ariella Weinberg-Shukron, Yair Hershkovitz, Sharon Zeligson, Ming K Lee, Abraham O Samson, Stanley M Parsons, Mary-Claire King, Ephrat Levy-Lahad, Tom Walsh
OBJECTIVE: To identify the genetic basis of a recessive congenital neurologic syndrome characterized by severe hypotonia, arthrogryposis, and respiratory failure. METHODS: Identification of the responsible gene by exome sequencing and assessment of the effect of the mutation on protein stability in transfected rat neuronal-like PC12(A123.7) cells. RESULTS: Two brothers from a nonconsanguineous Yemeni Jewish family manifested at birth with severe hypotonia and arthrogryposis...
February 10, 2017: Neurology
https://www.readbyqxmd.com/read/28181828/synthesis-of-sericin-based-conjugates-by-click-chemistry-enhancement-of-sunitinib-bioavailability-and-cell-membrane-permeation
#15
Luca Scrivano, Domenico Iacopetta, Maria Stefania Sinicropi, Carmela Saturnino, Pasquale Longo, Ortensia Ilaria Parisi, Francesco Puoci
Sericin is a natural protein that has been used in biomedical and pharmaceutical fields as raw material for polypeptide-based drug delivery systems (DDSs). In this paper, it has been employed as pharmaceutical biopolymer for the production of sunitinib-polypeptide conjugate. The synthesis has been carried out by simple click reaction in water, using the redox couple l-ascorbic acid/hydrogen peroxide as a free radical grafting initiator. The bioconjugate molecular weight (50 kDa < Mw < 75 kDa) was obtained by SDS-PAGE, while the spectroscopic characteristics have been studied in order to reveal the presence of grafted sunitinib...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28178978/enhanced-extracellular-production-of-recombinant-proteins-in-escherichia-coli-by-co-expression-with-bacillus-cereus-phospholipase-c
#16
Lingqia Su, Qi Jiang, Lingang Yu, Jing Wu
BACKGROUND: Our laboratory has reported a strategy for improving the extracellular production of recombinant proteins through co-expression with Thermobifida fusca cutinase, which increases membrane permeability via its phospholipid hydrolysis activity. However, the foam generated by the lysophospholipid product makes the fermentation process difficult to control in a fermentor. Phospholipase C (PLC) catalyzes the hydrolysis of phospholipids to produce sn1,2-diacylglycerides and organic phosphate, which do not induce foam formation...
February 8, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28178702/dysregulation-of-the-expression-of-asparagine-linked-glycosylation-13-short-isoform-2-affects-nephrin-function-by-altering-its-n-linked-glycosylation
#17
Teresa Esposito, Giovanni De Stefano, Mafalda Giovanna Reccia, Ilaria Di Lorenzo, Filomena Napolitano, Francesco Scalabrì, Alessia Lombardi, Moin A Saleem, Lyn R Griffiths, Fernando Gianfrancesco
BACKGROUND: N-linked glycosylation, which is a post-translational modification process, plays an important role in protein folding, intracellular trafficking and membrane targeting, as well as in regulating the protein function. Recently, we identified a missense variant (p.T141L) in the short isoform 2 of the X-linked gene asparagine-linked glycosylation 13 (ALG13-is2), which segregated with focal segmental glomerulosclerosis and PCCD in a large Australian pedigree; however, any evidence of its pathogenicity was demonstrated...
February 9, 2017: Nephron
https://www.readbyqxmd.com/read/28168866/complete-topology-inversion-can-be-part-of-normal-membrane-protein-biogenesis
#18
Nicholas B Woodall, Sarah Hadley, Ying Yin, James U Bowie
The topology of helical membrane proteins is generally defined during insertion of the transmembrane helices, yet it is now clear that it is possible for topology to change under unusual circumstances. It remains unclear, however, if topology reorientation is part of normal biogenesis. For dual topology dimer proteins such as the multidrug transporter EmrE, there may be evolutionary pressure to allow topology flipping so that the populations of both orientations can be equalized. We previously demonstrated that when EmrE is forced to insert in a distorted topology, topology flipping of the first transmembrane helix can occur during translation...
February 7, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28168761/functional-clues-from-the-crystal-structure-of-an-orphan-periplasmic-ligand-binding-protein-from-treponema-pallidum
#19
Chad A Brautigam, Ranjit K Deka, Wei Z Liu, Diana R Tomchick, Michael V Norgard
The spirochete Treponema pallidum is the causative agent of syphilis, a sexually transmitted infection of major global importance. Other closely related subspecies of Treponema also are the etiological agents of the endemic treponematoses, such as yaws, pinta, and bejel. The inability of T. pallidum and its close relatives to be cultured in vitro has prompted efforts to characterize T. pallidum's proteins structurally and biophysically, particularly those potentially relevant to treponemal membrane biology, with the goal of possibly revealing the functions of those proteins...
February 7, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28168212/novel-synaptobrevin-1-mutation-causes-fatal-congenital-myasthenic-syndrome
#20
Xin-Ming Shen, Rosana H Scola, Paulo J Lorenzoni, Cláudia S K Kay, Lineu C Werneck, Joan Brengman, Duygu Selcen, Andrew G Engel
OBJECTIVE: To identify the molecular basis and elucidate the pathogenesis of a fatal congenital myasthenic syndrome. METHODS: We performed clinical electrophysiology studies, exome and Sanger sequencing, and analyzed functional consequences of the identified mutation. RESULTS: Clinical electrophysiology studies of the patient revealed several-fold potentiation of the evoked muscle action potential by high frequency nerve stimulation pointing to a presynaptic defect...
February 2017: Annals of Clinical and Translational Neurology
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