Abstract:
:Eukaryotic cells activate the unfolded-protein response (UPR) upon endoplasmic reticulum (ER) stress, where the stress is assumed to be the accumulation of unfolded proteins in the ER. Consistent with previous in vitro studies of the ER-luminal domain of the mutant UPR initiator Ire1, our study show its association with a model unfolded protein in yeast cells. An Ire1 luminal domain mutation that compromises Ire1's unfolded-protein-associating ability weakens its ability to respond to stress stimuli, likely resulting in the accumulation of unfolded proteins in the ER. In contrast, this mutant was activated like wild-type Ire1 by depletion of the membrane lipid component inositol or by deletion of genes involved in lipid homeostasis. Another Ire1 mutant lacking the authentic luminal domain was up-regulated by inositol depletion as strongly as wild-type Ire1. We therefore conclude that the cytosolic (or transmembrane) domain of Ire1 senses membrane aberrancy, while, as proposed previously, unfolded proteins accumulating in the ER interact with and activate Ire1.
journal_name
Mol Biol Celljournal_title
Molecular biology of the cellauthors
Promlek T,Ishiwata-Kimata Y,Shido M,Sakuramoto M,Kohno K,Kimata Ydoi
10.1091/mbc.E11-04-0295subject
Has Abstractpub_date
2011-09-01 00:00:00pages
3520-32issue
18eissn
1059-1524issn
1939-4586pii
mbc.E11-04-0295journal_volume
22pub_type
杂志文章abstract::Previous research has found that a gamma-tubulin mutation in Schizosaccharomyces pombe is synthetically lethal with a deletion of the C-terminal motor domain kinesin-like protein gene pkl1, but the lethality of the double mutant prevents a phenotypic analysis of the synthetic interaction. We have investigated interact...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.12.10.3161
更新日期:2001-10-01 00:00:00
abstract::Thrombospondin (TSP) was demonstrated to inhibit the growth of bovine aortic endothelial cells, an activity that was not neutralized by antibodies to TSP or by other agents that block TSP-cell interactions but that partially was reversed by a neutralizing antibody to transforming growth factor-beta (TGF-beta). Similar...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.3.2.181
更新日期:1992-02-01 00:00:00
abstract::The Drosophila melanogaster genes Hrb87F and Hrb98DE encode the fly proteins HRB87F and HRB98DE (also known as hrp36 and hrp38, respectively) that are most similar in sequence and function to mammalian A/B-type hnRNP proteins. Using overexpression and deletion mutants of Hrb87F, we have tested the hypothesis that the ...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.7.7.1059
更新日期:1996-07-01 00:00:00
abstract::Focal adhesion kinase (FAK) is a cytoplasmic tyrosine kinase protein localized to regions called focal adhesions, which are contact points between cells and the extracellular matrix. FAK protein acts as a scaffold to transfer adhesion-dependent and growth factor signals into the cell. Increased FAK expression is linke...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.E10-12-0932
更新日期:2011-07-01 00:00:00
abstract::The cation-dependent mannose 6-phosphate receptor (CD-MPR) mediates the transport of lysosomal enzymes from the trans-Golgi network to endosomes. Evasion of lysosomal degradation of the CD-MPR requires reversible palmitoylation of a cysteine residue in its cytoplasmic tail. Because palmitoylation is reversible and ess...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e03-11-0808
更新日期:2004-06-01 00:00:00
abstract::Elicitins secreted by phytopathogenic Phytophthora spp. are proteinaceous elicitors of plant defense mechanisms and were demonstrated to load, carry, and transfer sterols between membranes. The link between elicitor and sterol-loading properties was assessed with the use of site-directed mutagenesis of the 47 and 87 c...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.12.9.2825
更新日期:2001-09-01 00:00:00
abstract::Heterotrimeric G proteins are components of principal signaling pathways in eukaryotes. In higher organisms, alpha subunits of G proteins have been divided into four families, Gi, Gs, Gq, and G12. We previously identified a G alpha i homologue gna-1 in the filamentous fungus Neurospora crassa. Now we report that delet...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.7.8.1283
更新日期:1996-08-01 00:00:00
abstract::In the yeast Saccharomyces cerevisiae, the Apg12p-Apg5p conjugating system is essential for autophagy. Apg7p is required for the conjugation reaction, because Apg12p is unable to form a conjugate with Apg5p in the apg7/cvt2 mutant. Apg7p shows a significant similarity to a ubiquitin-activating enzyme, Uba1p. In this a...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.10.5.1367
更新日期:1999-05-01 00:00:00
abstract::The inositol 1,4,5-trisphosphate receptor (IP3R) is an intracellular calcium channel involved in coupling cell membrane receptors to calcium signal transduction pathways within cells including endocrine cells. Several isoforms (I, II, and III) of IP3Rs have been identified, which are encoded by separate genes, and are...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.7.6.949
更新日期:1996-06-01 00:00:00
abstract::Manganese (Mn) protects cells against lethal doses of purified Shiga toxin by causing the degradation of the cycling transmembrane protein GPP130, which the toxin uses as a trafficking receptor. Mn-induced GPP130 down-regulation, in addition to being a potential therapeutic approach against Shiga toxicosis, is a model...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.E14-05-1003
更新日期:2014-10-01 00:00:00
abstract::A novel selection scheme has been developed to isolate bloodstream forms of Trypanosoma brucei, which are defective in their ability to differentiate to the procyclic stage. Detailed characterization of one selected cell line (defective in differentiation clone 1 [DiD-1]) has demonstrated that these cells are indistin...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.11.5.1905
更新日期:2000-05-01 00:00:00
abstract::The Cvt pathway is a biosynthetic transport route for a distinct subset of resident yeast vacuolar hydrolases, whereas macroautophagy is a nonspecific degradative mechanism that allows cell survival during starvation. Yet, these two vacuolar trafficking pathways share a number of identical molecular components and are...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e03-07-0479
更新日期:2004-05-01 00:00:00
abstract::Shrew-1 was previously isolated from an endometriotic cell line in our search for invasion-associated genes. It proved to be a membrane protein that targets to the basolateral membrane of polarized epithelial cells, interacting with E-cadherin-catenin complexes of adherens junctions. Paradoxically, the existence of ad...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e06-07-0637
更新日期:2007-04-01 00:00:00
abstract::In all eucaryotic cell types analyzed, proliferations of the endoplasmic reticulum (ER) can be induced by increasing the levels of certain integral ER proteins. One of the best characterized of these proteins is HMG-CoA reductase, which catalyzes the rate-limiting step in sterol biosynthesis. We have investigated the ...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.7.5.769
更新日期:1996-05-01 00:00:00
abstract::CD98, an early marker of T-cell activation, is an important regulator of integrin-mediated adhesion events. Previous studies suggest that CD98 is coupled to both cellular activation and transformation and is involved in the pathogenesis of viral infection, inflammatory disease, and cancer. Understanding of the molecul...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.01-11-0530
更新日期:2002-08-01 00:00:00
abstract::A major regulatory function has been evidenced here for HSF1, the key transcription factor of the heat-shock response, in a large-scale remodeling of the cell epigenome. Indeed, upon heat shock, HSF1, in addition to its well-known transactivating activities, mediates a genome-wide and massive histone deacetylation. In...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e09-04-0295
更新日期:2009-12-01 00:00:00
abstract::Polyadenylation-induced translation is an important regulatory mechanism during metazoan development. During Xenopus oocyte meiotic progression, polyadenylation-induced translation is regulated by CPEB, which is activated by phosphorylation. XGef, a guanine exchange factor, is a CPEB-interacting protein involved in th...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e04-07-0585
更新日期:2005-03-01 00:00:00
abstract::Axonemal dyneins are molecular motors that drive the beating of cilia and flagella. We report here the identification and partial cloning of seven unique axonemal dynein heavy chains from rat tracheal epithelial (RTE) cells. Combinations of axonemal-specific and degenerate primers to conserved regions around the catal...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.7.1.71
更新日期:1996-01-01 00:00:00
abstract::GRIM-19 was found to copurify with complex I of mitochondrial respiratory chain and subsequently was demonstrated to be involved in complex I assembly and activity. To further understand its function in complex I, we dissected its functional domains by generating a number of deletion, truncation, and point mutants. Th...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e07-07-0683
更新日期:2008-05-01 00:00:00
abstract::Bone morphogenetic protein (BMP) signaling pathways control many developmental and homeostatic processes, including cell size and extracellular matrix remodeling. An understanding of how this pathway itself is controlled remains incomplete. To identify novel regulators of BMP signaling, we performed a forward genetic ...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.E19-09-0500
更新日期:2019-12-15 00:00:00
abstract::Stimulation of the T-cell receptor (TCR) results in the activation of several transcription factors, including NF-kappaB, that are crucial for T-cell proliferation and gain of effector functions. On TCR engagement, several proteins within the TCR-directed NF-kappaB signaling pathway undergo dynamic spatial redistribut...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e05-10-0985
更新日期:2006-05-01 00:00:00
abstract::Retroviral assembly is driven by Gag, and nascent viral particles escape cells by recruiting the machinery that forms intralumenal vesicles of multivesicular bodies. In this study, we show that the clathrin adaptor complex AP-1 is involved in retroviral release. The absence of AP-1mu obtained by genetic knock-out or b...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e06-12-1147
更新日期:2007-08-01 00:00:00
abstract::Episialin (MUC1, PEM, EMA, CA15-3 antigen) is a sialylated, membrane-associated glycoprotein with an extended mucin-like ectodomain. This domain mainly consists of 30-90 homologous 20-amino acid repeats that are rich in O-glycosylation sites (serines and threonines). It is likely that this part forms a polyproline bet...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.7.4.565
更新日期:1996-04-01 00:00:00
abstract::Molecular chaperones play key roles during growth, development, and stress survival. The ability to induce chaperone expression enables cells to cope with the accumulation of nonnative proteins under stress and complete developmental processes with an increased requirement for chaperone assistance. Here we generate an...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.E14-02-0742
更新日期:2014-08-01 00:00:00
abstract::Isu, the scaffold protein on which Fe-S clusters are built in the mitochondrial matrix, plays a central role in the biogenesis of Fe-S cluster proteins. We report that the reduction in the activity of several components of the cluster biogenesis system, including the specialized Hsp70 Ssq1, causes a 15-20-fold up-regu...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e08-06-0622
更新日期:2008-12-01 00:00:00
abstract::We have used E1A probes to study the roles of the p34cdc2 kinase and the retinoblastoma tumor susceptibility gene product (pRB) in transforming growth factor beta 1 (TGF beta 1)-mediated growth suppression in mink lung epithelial (Mv1Lu) cells. In agreement with previous reports, we see a decline in p34cdc2 kinase act...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.3.6.655
更新日期:1992-06-01 00:00:00
abstract::The budding yeast formins Bni1 and Bnr1 control the assembly of actin cables. These formins exhibit distinct patterns of localization and polymerize two different populations of cables: Bni1 in the bud and Bnr1 in the mother cell. We generated a functional Bni1-3GFP that improved the visualization of Bni1 in vivo at e...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e06-09-0820
更新日期:2007-05-01 00:00:00
abstract::More than 130 different mutations in the gap junction integral plasma membrane protein connexin32 (Cx32) have been linked to the human peripheral neuropathy X-linked Charcot-Marie-Tooth disease (CMTX). How these various mutants are processed by the cell and the mechanism(s) by which they cause CMTX are unknown. To add...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.11.6.1933
更新日期:2000-06-01 00:00:00
abstract::All vertebrates contain two nonmuscle myosin II heavy chains, A and B, which differ in tissue expression and subcellular distributions. To understand how these distinct distributions are controlled and what role they play in cell migration, myosin IIA and IIB were examined during wound healing by bovine aortic endothe...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.e03-04-0205
更新日期:2003-12-01 00:00:00
abstract::Scientific communication, career advancement, and funding decisions are all dependent on research publications. The way manuscripts are handled by high-visibility, professionally edited magazines differs from the way academic journals evaluate manuscripts, using active scientists as monitoring editors. In this essay, ...
journal_title:Molecular biology of the cell
pub_type: 杂志文章
doi:10.1091/mbc.E12-12-0899
更新日期:2013-04-01 00:00:00