Abstract:
:Arf GTPases regulate both the morphological and protein sorting events that are essential for membrane trafficking. Guanine nucleotide exchange factors (GEFs) specific for Arf proteins determine when and where Arf GTPases will be activated in cells. The yeast Gea2p Arf GEF is a member of an evolutionarily conserved family of high molecular mass Arf GEFs that are peripherally associated with membranes. Nothing is known about how these proteins are localized to membranes, and few direct binding partners have been identified. In yeast, Gea2p has been implicated in trafficking through the Golgi apparatus and in maintaining Golgi structure. A major function of the Golgi apparatus is the packaging of cargo into secretory granules or vesicles. This process occurs through a series of membrane transformation events starting with fenestration of a saccular membrane, and subsequent remodeling of the fenestrated membrane into a mesh-like tubular network. Concentration of secretory cargo into nodes of the tubular network leads to enlargement of the nodes, which correspond to forming vesicles/granules, and thinning of the surrounding tubules. The tubules eventually break to release the secretory vesicles/granules into the cytoplasm. This process is highly conserved at the morphological level from yeast to mammalian cells. Drs2p, a multi-span transmembrane domain protein and putative aminophospholipid translocase, is required for the formation of a class of secretory granules/vesicles in yeast. Here we show that Drs2p interacts directly with Gea2p, both in vitro and in vivo. We mapped the domain of interaction of Drs2p to a 20-amino-acid region of the C-terminal cytoplasmic tail of the protein, adjacent to a region essential for Drs2p function. Mutations in Gea2p that abolish interaction with Drs2p are clustered in the C-terminal third of the Sec7 domain, and are important for Gea2p function. We characterize one such mutant that has a thermosensitive phenotype, and show that it has morphological defects along the secretory pathway in the formation of secretory granules/vesicles.
journal_name
J Cell Scijournal_title
Journal of cell scienceauthors
Chantalat S,Park SK,Hua Z,Liu K,Gobin R,Peyroche A,Rambourg A,Graham TR,Jackson CLdoi
10.1242/jcs.00896keywords:
subject
Has Abstractpub_date
2004-02-15 00:00:00pages
711-22issue
Pt 5eissn
0021-9533issn
1477-9137pii
jcs.00896journal_volume
117pub_type
杂志文章abstract::Understanding the interactions between distinct epithelial cells would help us to understand the development of tissues. Drosophila imaginal discs, which are made up of two types of epithelial cells, provide good model systems for such studies. The disc proper or the columnar epithelial cells are apposed to a layer of...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.02464
更新日期:2005-08-01 00:00:00
abstract::Activator of G-protein signaling 3 (AGS3, also known as GPSM1) regulates the trans-Golgi network. The AGS3 GoLoco motif binds to Gαi and thereby regulates the transport of proteins to the plasma membrane. Compaction of early embryos is based on the accumulation of E-cadherin (Cdh1) at cell-contacted membranes. However...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.243238
更新日期:2020-12-07 00:00:00
abstract::Defects in the biogenesis of the spindle pole body (SPB), the yeast centrosome equivalent, can lead to monopolar spindles and mitotic catastrophe. The KASH domain protein Kms2 and the SUN domain protein Sad1 colocalize within the nuclear envelope at the site of SPB attachment during interphase and at the spindle poles...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.154997
更新日期:2014-08-15 00:00:00
abstract::BAG6 participates in protein quality control and, here, we address its role in endoplasmic-reticulum-associated degradation (ERAD) by using the polytopic membrane protein OpD, an opsin degron mutant. Both BAG6 knockdown and BAG6 overexpression delay OpD degradation; however, our data suggest that these two perturbatio...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.145565
更新日期:2014-07-01 00:00:00
abstract::Stress can be temporary or chronic, and mild or acute. Depending on its extent and severity, cells either alter their metabolism, and adopt a new state, or die. Fluctuations in environmental conditions occur frequently, and such stress disturbs cellular homeostasis, but in general, stresses are reversible and last onl...
journal_title:Journal of cell science
pub_type: 杂志文章,评审
doi:10.1242/jcs.202002
更新日期:2018-02-14 00:00:00
abstract::5'AMP nucleotidase activity was localized by electron microscopy in Dictyostelium discoideum during cell differentiation. In addition, the activity was assayed by micro enzymic methods in sections dissected from specific cellular regions of lyophilized individuals. The results of the 2 procedures were in agreement, de...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:
更新日期:1980-10-01 00:00:00
abstract::Mdm2 is a nucleoplasmic and nucleolar protein interacting with p53 and alternative reading frame (ARF) tumor suppressor proteins. Here we demonstrate relocalization and novel interactions of Mdm2 with the promyelocytic leukemia (PML) protein following cellular stress and DNA damage. We show that Mdm2 and PML interact ...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.00714
更新日期:2003-10-01 00:00:00
abstract::We have characterised the functional regulation of the type-3 ryanodine receptor by the 12 kDa FK506-binding protein. Wild-type type-3 ryanodine receptor and mutant type-3 ryanodine receptor in which the critical valine at position 2322 in the central 12 kDa FK506-binding protein binding site was substituted by aspart...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.00948
更新日期:2004-03-01 00:00:00
abstract::The secreted Frizzled-related proteins (SFRPs) are a family of soluble proteins that are structurally related to Frizzled (Fz) proteins, the serpentine receptors that mediate the extensively used cell-cell communication pathway involving Wnt signalling. Because of their homology with the Wnt-binding domain on the Fz r...
journal_title:Journal of cell science
pub_type: 杂志文章,评审
doi:10.1242/jcs.026096
更新日期:2008-03-15 00:00:00
abstract::Activation and invasion of the vascular endothelium by Staphylococcus aureus is a major cause of sepsis and endocarditis. For endothelial cell invasion, S. aureus triggers actin polymerization through Cdc42, N-WASp (also known as WASL) and the Arp2/3 complex to assemble a phagocytic cup-like structure. Here, we show t...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.186213
更新日期:2016-08-01 00:00:00
abstract::The specific phosphatase inhibitor okadaic acid (OA) induced fragmentation of the Golgi apparatus in interphase HeLa cells. Immunoelectron microscopy for galactosyltransferase identified a major Golgi fragment composed of a cluster of vesicles and tubules that was morphologically indistinguishable from the 'Golgi clus...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:
更新日期:1991-12-01 00:00:00
abstract::We previously demonstrated that activation of v-ABL protein tyrosine kinase resulted in suppression of apoptosis following interleukin-3 removal using an interleukin-3-dependent haemopoietic cell line transfected with a temperature-sensitive mutant of the v-abl oncoprotein (IC.DP). Cellular signalling events associate...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:
更新日期:1995-07-01 00:00:00
abstract::Murine mesenchymal stem cells are capable of differentiating in vitro into different lineages under stimulation with certain cytokines, growth factors and chemicals. However, the true capacity of these cells to contribute to different cell-types in vivo is still unclear, especially under minimal injury conditions. In ...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.01488
更新日期:2004-11-01 00:00:00
abstract::To study the influence of the non alpha-helical tail domain of keratins in filament formation, we prepared a truncated keratin 8 mutant, K8/tailless. Using site-directed in vitro mutagenesis we introduced a stop codon in the position coding for amino acid number 417 of the K8/wild-type sequence, thereby deleting 86 am...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:
更新日期:1990-10-01 00:00:00
abstract::The CHO1 antigen is a mitosis-specific kinesin-like motor located at the interzonal region of the spindle. The human cDNA coding for the antigen contains a domain with sequence similarity to the motor domain of kinesin-like protein (Nislow et al., Nature 359, 543, 1992). Here we cloned cDNAs encoding the CHO1 antigen ...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:
更新日期:1994-12-01 00:00:00
abstract::Ryanodine receptor subtype 1 (RyR1) has been primarily characterized in skeletal muscle but several studies have revealed its expression in smooth muscle. Here, we used Ryr1-null mice to investigate the role of this isoform in Ca(2+) signaling in urinary bladder smooth muscle. We show that RyR1 is required for depolar...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.009415
更新日期:2007-11-01 00:00:00
abstract::Skeletal and heart muscle-specific variant of the α subunit of nascent polypeptide associated complex (skNAC; encoded by NACA) is exclusively found in striated muscle cells. Its function, however, is largely unknown. Previous reports have demonstrated that skNAC binds to m-Bop/Smyd1, a multi-functional protein that re...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.150334
更新日期:2014-09-01 00:00:00
abstract::Pin1/Ess1p is a highly conserved WW domain-containing peptidyl-prolyl isomerase (PPIase); its WW domain binds specifically to phospho-Ser/Thr-Pro sequences and its catalytic domain isomerizes phospho-Ser/Thr-Pro bonds. Pin1 PPIase activity can alter protein conformation in a phosphorylation-dependent manner and/or pro...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:
更新日期:2001-10-01 00:00:00
abstract::Prox1 is a master regulator for the development of lymphatic vasculature and the induction of lymphangiogenesis. In this study, we identified Prox1 as a new target for small ubiquitin-like modifier 1 (SUMO-1). Lysine 556 (K556) was found to be the major sumoylation site for Prox1 in vitro and in vivo. Mutation of this...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.050005
更新日期:2009-09-15 00:00:00
abstract::Microinjection of a bacterially expressed, TRITC labelled fragment of the centrosome-associated protein CP190 of Drosophila melanogaster, into syncytial Drosophila embryos, shows it to associate with the centrosomes during mitosis, and to relocate to chromatin during interphase. Indirect immunofluorescence staining of...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:
更新日期:1995-11-01 00:00:00
abstract::Nedd1 is a new member of the gamma-tubulin ring complex (gammaTuRC) and targets the gammaTuRC to the centrosomes for microtubule nucleation and spindle assembly in mitosis. Although its role is known, its functional regulation mechanism remains unclear. Here we report that the function of Nedd1 is regulated by Cdk1 an...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.042747
更新日期:2009-07-01 00:00:00
abstract::An essential step in mammalian fertilisation is the sperm acrosome reaction (AR) - exocytosis of a single large vesicle (the acrosome) that surrounds the nucleus at the apical sperm head. The acrosomal and plasma membranes fuse, resulting in both the release of factors that might facilitate penetration of the zona pel...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.030379
更新日期:2008-07-01 00:00:00
abstract::The small GTPase Arf4 and the Arf GTPase-activating protein (GAP) ASAP1 cooperatively sequester sensory receptor cargo into transport carriers targeted to primary cilia, but the input that drives Arf4 activation in this process remains unknown. Here, we show, by using frog retinas and recombinant human proteins, that ...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.205492
更新日期:2017-12-01 00:00:00
abstract::Mesenchymal stromal progenitor cells (MSCs) are multipotent progenitors that can be isolated from numerous tissues. MSCs can undergo osteogenic differentiation under proper stimuli. We have recently demonstrated that bone morphogenetic protein 9 (BMP9) is one of the most osteogenic BMPs. As one of the least studied BM...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.114231
更新日期:2013-01-15 00:00:00
abstract::The working mechanism of the eukaryotic flagellar axoneme remains one of nature's most enduring puzzles. The basic mechanical operation of the axoneme is now a story that is fairly complete; however, the mechanism for coordinating the action of the dynein motor proteins to produce beating is still controversial. Altho...
journal_title:Journal of cell science
pub_type: 杂志文章,评审
doi:10.1242/jcs.051326
更新日期:2010-02-15 00:00:00
abstract::Embryonal rhabdomyosarcomas (ERMSs) show elevated levels of PAX7, a transcription factor that marks quiescent adult muscle stem (satellite) cells and is important for proliferation and survival of activated satellite cells and whose timely repression is required for myogenic differentiation. However, the mechanism of ...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.136259
更新日期:2014-04-15 00:00:00
abstract::Endothelial cell-based angiogenesis requires activation of survival signals that generate resistance to external apoptotic stimuli, such as tumor necrosis factor-alpha (TNF-alpha), during pathobiologic settings. Mechanisms by which this is achieved are not fully defined. Here, we use a model in which the multifunction...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.03361
更新日期:2007-02-01 00:00:00
abstract::Formation of crossovers between homologous chromosomes during meiosis is positively regulated by the ZMM proteins (also known as SIC proteins). DNA damage checkpoint proteins also promote efficient formation of interhomolog crossovers. Here, we examined, in budding yeast, the meiotic role of the heterotrimeric DNA dam...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.161554
更新日期:2015-04-15 00:00:00
abstract::Reorganization of the actin cytoskeleton is essential to numerous cellular processes including cell locomotion and cytokinesis. This actin remodeling is regulated in part by Rho family GTPases. Previous studies implicated Trio, a Dbl-homology guanine nucleotide exchange factor with two exchange factor domains, in regu...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:
更新日期:2001-01-01 00:00:00
abstract::Eukaryotic flagella undertake different beat types as necessary for different functions; for example, the Leishmania parasite flagellum undergoes a symmetric tip-to-base beat for forward swimming and an asymmetric base-to-tip beat to rotate the cell. In multi-ciliated tissues or organisms, the asymmetric beats are coo...
journal_title:Journal of cell science
pub_type: 杂志文章
doi:10.1242/jcs.246637
更新日期:2020-10-22 00:00:00