Abstract:
:Cholera toxin (CT) is composed of a disulfide-linked A1/A2 heterodimer and a ring-like, cell-binding B homopentamer. The catalytic A1 subunit must dissociate from CTA2/CTB5 to manifest its cellular activity. Reduction of the A1/A2 disulfide bond is required for holotoxin disassembly, but reduced CTA1 does not spontaneously separate from CTA2/CTB5: protein disulfide isomerase (PDI) is responsible for displacing CTA1 from its non-covalent assembly in the CT holotoxin. Contact with PDI shifts CTA1 from a protease-resistant conformation to a protease-sensitive conformation, which is thought to represent the PDI-mediated unfolding of CTA1. Based solely on this finding, PDI is widely viewed as an 'unfoldase' that triggers toxin disassembly by unfolding the holotoxin-associated A1 subunit. In contrast with this unfoldase model of PDI function, we report the ability of PDI to render CTA1 protease-sensitive is unrelated to its role in toxin disassembly. Multiple conditions that promoted PDI-induced protease sensitivity in CTA1 did not support PDI-mediated disassembly of the CT holotoxin. Moreover, preventing the PDI-induced shift in CTA1 protease sensitivity did not affect PDI-mediated disassembly of the CT holotoxin. Denatured PDI could still convert CTA1 into a protease-sensitive state, and equal or excess molar fractions of PDI were required for both efficient conversion of CTA1 into a protease-sensitive state and efficient disassembly of the CT holotoxin. These observations indicate the 'unfoldase' property of PDI does not play a functional role in CT disassembly and does not represent an enzymatic activity.
journal_name
Biosci Repjournal_title
Bioscience reportsauthors
Cherubin P,Guyette J,Taylor M,O'Donnell M,Herndon L,Burress H,Riad A,Tatulian SA,Teter Kdoi
10.1042/BSR20181320subject
Has Abstractpub_date
2018-09-07 00:00:00issue
5eissn
0144-8463issn
1573-4935pii
BSR20181320journal_volume
38pub_type
杂志文章abstract::Coagulation factor IX (FIX) is an essential plasma protein for blood coagulation. The first epidermal growth factor (EGF) motif of FIX (EGF-F9) has been reported to attenuate cell adhesion to the extracellular matrix (ECM). The purpose of the present study was to determine the effects of this motif on cell adhesion an...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20160098
更新日期:2016-06-03 00:00:00
abstract::The cDNA encoding about half of an antigenic non-surface schistosome parasite protein of Mr 97 K has recently been cloned and sequenced (Lanar, Pearce, James and Sher (1986) Science 234:593-596). Analysis of this sequence, together with the properties of the native protein, reveals that this protein is paramyosin, the...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1007/BF01122722
更新日期:1987-01-01 00:00:00
abstract::Ovarian cancer is a highly lethal cancer in females. Therefore, it is necessary to explore effective biomarkers for the diagnosis and prognosis of the disease. Stratifin (SFN) is a cell cycle checkpoint protein that has been reported to be involved in oncogenesis. Our studies detected the expression of SFN in ovarian ...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20190100
更新日期:2019-05-02 00:00:00
abstract::Background: Many epidemiologic studies have explored the association between age at last birth (ALB) and the risk of epithelial ovarian cancer, but the results remain controversial. Methods: A literature search was performed in PubMed, Web of Science, China National Knowledge Infrastructure (CNKI) and WanFang Med Onli...
journal_title:Bioscience reports
pub_type: 杂志文章,meta分析
doi:10.1042/BSR20182035
更新日期:2019-09-13 00:00:00
abstract::Merremia vitifolia (Burm.f.) Hallier f., an ethnomedicinally important plant, used in the tribal areas to treat various ailments including fever, headache, eye inflammation, rheumatism, dysentery, jaundice and urinary diseases. The present study explored the biological efficacy of the aqueous fraction of M. vitifolia ...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20203022
更新日期:2021-01-29 00:00:00
abstract::PU box binding protein (PU.1) is a critical transcription factor involved in many pathological processes. However, its exact role in activation of hepatic stellate cells (HSCs) and liver fibrosis was rarely reported. Here, we found that, in HSCs of PU.1+/- mice, Sirt1 mRNA expression was not changed but Sirt1 protein ...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20170926
更新日期:2017-12-12 00:00:00
abstract::Human cytomegalovirus (HCMV) infection can cause inflammatory tissue-invasive end-organ diseases upon lytic replication. In humans, mature miR-200b-3p and -200c-3p suppress the synthesis of HCMV immediate early 2 (IE2) protein by binding to the 3'-UTR of the mRNA encoded by the unique long (UL) 122-123 region in human...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20180961
更新日期:2018-12-07 00:00:00
abstract::The 7-nitro-2,1,3-nitrobenzoxadiazole (NBD) derivatives are a series of compounds containing the NBD scaffold that are not glutathione (GSH) peptidomimetics, and result in a strong inhibition of glutathione S-transferases (GSTs). Growing evidences highlight their pivotal roles and outstanding anticancer activity in di...
journal_title:Bioscience reports
pub_type: 杂志文章,评审
doi:10.1042/BSR20171440
更新日期:2018-02-13 00:00:00
abstract::Interleukin-21 (IL-21) is a cytokine that plays a crucial role in pathogenesis and activity of the rheumatoid arthritis (RA). Meanwhile, genetic polymorphisms in the IL-21 gene may alter its expression. Previous studies have reported conflicting results assessing the association between the IL-21 rs6822844 G/T polymor...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20191449
更新日期:2020-01-31 00:00:00
abstract::Atherosclerosis is the primary cause of several cardiovascular diseases. Oxidized low-density lipoprotein (ox-LDL)-induced apoptosis, endothelial-mesenchymal transition (EndMT), and inflammation are crucial for the progression of cardiovascular diseases, including atherosclerosis. Naringin, a major compound from tomat...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20193431
更新日期:2020-03-27 00:00:00
abstract::Glioblastomas (GBMs) are a lethal class of brain cancer, with a median survival <15 months in spite of therapeutic advances. The poor prognosis of GBM is largely attributed to acquired chemotherapy resistance, and new strategies are urgently needed to target resistant glioma cells. Here we report a role for miR-299-5p...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20181051
更新日期:2018-09-12 00:00:00
abstract::Many miRNAs play critical roles in modulating various biological processes of osteoclast differentiation and function. Microphthalmia-associated transcription factor (MITF), a target of miR-340, served as pivotal transcription factor involved in osteoclast differentiation. However, the role of miR-340 and MITF during ...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20170302
更新日期:2017-07-20 00:00:00
abstract:BACKGROUND:Both meta-analyses and systematic reviews were used to assess the relationship between purinergic receptor P2X ligand-gated ion channel 7 (P2RX7) rs3751143 polymorphism and the risk of cancer. MATERIALS AND METHODS:The data used in this research were collected from Google Scholar, Web of Science, CNKI, and ...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20193877
更新日期:2021-01-27 00:00:00
abstract::An increase in the permeability of outer mitochondrial membrane is central to apoptotic cell death, and results in the release of several apoptogenic factors such as cytochrome c into the cytoplasm to activate downstream destructive programs. The voltage-dependent anion channel (VDAC or mitochondrial porin) plays an e...
journal_title:Bioscience reports
pub_type: 杂志文章,评审
doi:10.1023/a:1016061006256
更新日期:2002-02-01 00:00:00
abstract::Mitochondrial dysfunction causes a range of early-onset neurological diseases and contributes to neurodegenerative conditions. The mechanisms of neurological damage however are poorly understood, as accessing relevant tissue from patients is difficult, and appropriate models are limited. Hence, we assessed mitochondri...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20140151
更新日期:2014-11-21 00:00:00
abstract::Chemical transformations, like osmotic translocations, are transport processes when looked at in detail. In chemiosmotic systems, the pathways of specific ligand conduction are spatially orientated through osmoenzymes and porters in which the actions of chemical group, electron and solute transfer occur as vectorial (...
journal_title:Bioscience reports
pub_type:
doi:10.1007/s10540-005-2739-2
更新日期:2004-08-01 00:00:00
abstract::Our study aimed at exploring the effects of miR-211 on the proliferation and apoptosis of lens epithelial cells in diabetic cataract mice by targetting NAD+-dependent histone deacetylase sirtulin 1 (SIRT1). Healthy male mice were assigned into normal and diabetic cataract groups. Blood glucose, lens turbidity, and apo...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20170695
更新日期:2017-07-27 00:00:00
abstract::Two established cancer cell lines, MCF-7 and Ishikawa, were both obtained directly from a cell repository and through another laboratory. The karyotypes from the two MCF-7 cell lines had up to 83 chromosomes and similarities for chromosomal gain and structural abnormalities. The two Ishikawa cell lines had up to 60 ch...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1007/s10540-005-2797-5
更新日期:2004-12-01 00:00:00
abstract::Partitioning in charge-sensitive dextran-poly(ethylene glycol) aqueous phase systems reveals that fixation with even small concentrations of glutaraldehyde (e.g., 0.1% w/v) changes the surface properties of cells. While fixation with larger concentrations of glutaraldehyde (i.e., 1.85%) increases erythrocyte partition...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1007/BF01114811
更新日期:1989-12-01 00:00:00
abstract::Keratin 18 (KRT18) has been suggested to be overexpressed in most types of human tumor, but the expression pattern of KRT18 in colorectal cancer (CRC) remained unknown. In our research, KRT18 protein expression was markedly increased in CRC cancer tissues and cell lines compared with adjacent normal colorectal tissues...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20190884
更新日期:2019-08-13 00:00:00
abstract:OBJECTIVES:To investigate the association between dectin-1 gene single nucleotide polymorphisms (SNPs) and susceptibility to fungal infection (FI). METHODS:Databases were searched electronically and manually to identify case-control studies concerning dectin-1 SNPs and FI, which were published up to 12 November 2018. ...
journal_title:Bioscience reports
pub_type: 杂志文章,meta分析
doi:10.1042/BSR20191519
更新日期:2019-11-29 00:00:00
abstract::The purpose of the study is to investigate the correlation between the expression of C-reactive protein (CRP) and autophagy-related 9B (ATG9B) and pathological features of clear cell renal cell carcinoma (CCRCC) patients. We also intended to explore the effects of manipulated expression of CRP and ATG9B on the apoptos...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20171082
更新日期:2017-11-15 00:00:00
abstract::Cryogenic transmission electron microscopy (cryo-TEM) is a high-resolution biological imaging method, whereby biological samples, such as purified proteins, macromolecular complexes, viral particles, organelles and cells, are embedded in vitreous ice preserving their native structures. Due to sensitivity of biological...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20170203
更新日期:2018-04-27 00:00:00
abstract::Recent experimental evidence increasingly shows that the dysregulation of cellular bioenergetics is associated with a wide array of common human diseases, including cancer, neurological diseases and diabetes. Respiration provides a vital source of cellular energy for most eukaryotic cells, particularly high energy dem...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20160083
更新日期:2016-06-30 00:00:00
abstract::Kawasaki disease (KD) is a type of disease that includes the development of a fever that lasts at least 5 days and involves the clinical manifestation of multicellular vasculitis. KD has become one of the most common pediatric cardiovascular diseases. Previous studies have reported that miR-218 rs11134527 A>G is assoc...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20180367
更新日期:2018-05-22 00:00:00
abstract:OBJECTIVE:The current study aimed to investigate the functional roles and clinical significance of microRNA-148a (miR-148a) in the progression of oral squamous cell carcinoma (OSCC). METHODS:Relative expression of miR-148a in OSCC cells and tissues were detected using quantitative real-time polymerase chain reaction (...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20182458
更新日期:2020-04-30 00:00:00
abstract::Goblet cells (GCs) are single-cell glands that produce and secrete mucin. Mucin forms a mucus layer, which can separate the materials in cavities from the intestinal epithelium and prevent the invasion of pathogenic microorganisms in various ways. GCs can also participate in the immune response through nonspecific end...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1042/BSR20201471
更新日期:2020-10-30 00:00:00
abstract::Heterotopic ossification (HO) is the aberrant formation of mature, lamellar bone in nonosseous tissue. Fibrodysplasia ossificans progressiva (FOP) is a rare and devastating genetic disorder that causes progressive HO in the ligaments, tendons, and muscles throughout the body. FOP is attributed to an autosomal mutation...
journal_title:Bioscience reports
pub_type: 杂志文章,评审
doi:10.1042/BSR20190377
更新日期:2019-08-02 00:00:00
abstract::The sarcolemma of smooth-muscle cells from human pregnant myometrium possesses a high-affinity Ca2+-ATPase, which has the characteristics of an active Ca2+-extrusion pump. This pump enzyme, either membrane-bound or solubilized, was strongly inhibited by oxytocin (half-maximal inhibition at about 4 microU/ml or 10 pM)....
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1007/BF01117437
更新日期:1985-01-01 00:00:00
abstract::Lung surfactant protein A (SP-A) is the most abundant surfactant-associated protein present in the lung. A receptor for SP-A has been shown to be present on A549 alveolar type II cells and on other cell types, including alveolar macrophage. The SP-A receptor on A549 cells has been identified as the collection receptor...
journal_title:Bioscience reports
pub_type: 杂志文章
doi:10.1007/BF01145960
更新日期:1993-04-01 00:00:00