abstract：:How recycling receptors are segregated from down-regulated receptors in the endosome is unknown. In previous studies, we demonstrated that substitutions in the transferrin receptor (TR) transmembrane domain (TM) convert the protein from an efficiently recycling receptor to one that is rapidly down regulated. In this s...

journal_title：Molecular biology of the cell

authors： Zaliauskiene L,Kang S,Brouillette CG,Lebowitz J,Arani RB,Collawn JF

更新日期：2000-08-01 00:00:00

abstract：:The role of platelet endothelial cell adhesion molecule-1 (PECAM-1) in endothelial cell-cell interactions and its contribution to cadherin-mediated cell adhesion are poorly understood. Such studies have been difficult because all known endothelial cells express PECAM-1. We have used Madin-Darby canine kidney (MDCK) ce...

journal_title：Molecular biology of the cell

authors： Sheibani N,Sorenson CM,Frazier WA

更新日期：2000-08-01 00:00:00

abstract：:Polyubiquitination marks proteins for degradation by the 26S proteasome and is carried out by a cascade of enzymes that includes ubiquitin-activating enzymes (E1s), ubiquitin-conjugating enzymes (E2s), and ubiquitin ligases (E3s). The anaphase-promoting complex or cyclosome (APC/C) comprises a multisubunit ubiquitin l...

journal_title：Molecular biology of the cell

authors： Leverson JD,Joazeiro CA,Page AM,Huang Hk,Hieter P,Hunter T

更新日期：2000-07-01 00:00:00

abstract：:Vac8p is a vacuolar membrane protein that is required for efficient vacuole inheritance and fusion, cytosol-to-vacuole targeting, and sporulation. By analogy to other armadillo domain proteins, including beta-catenin and importin alpha, we hypothesize that Vac8p docks various factors at the vacuole membrane. Two-hybri...

journal_title：Molecular biology of the cell

authors： Pan X,Roberts P,Chen Y,Kvam E,Shulga N,Huang K,Lemmon S,Goldfarb DS

更新日期：2000-07-01 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

authors： VanSlyke JK,Deschenes SM,Musil LS

更新日期：2000-06-01 00:00:00

abstract：:Important aspects of cell cycle regulation are the checkpoints, which respond to a variety of cellular stresses to inhibit cell cycle progression and act as protective mechanisms to ensure genomic integrity. An increasing number of tumor suppressors are being demonstrated to have roles in checkpoint mechanisms, implyi...

journal_title：Molecular biology of the cell

authors： Qiu L,Burgess A,Fairlie DP,Leonard H,Parsons PG,Gabrielli BG

更新日期：2000-06-01 00:00:00

abstract：:MAGP-1 and fibrillin-1, two protein components of extracellular microfibrils, were shown by immunoprecipitation studies to interact with the chondroitin sulfate proteoglycan decorin in the medium of cultured fetal bovine chondrocytes. Decorin interacted with each protein individually and with both proteins together to...

journal_title：Molecular biology of the cell

authors： Trask BC,Trask TM,Broekelmann T,Mecham RP

更新日期：2000-05-01 00:00:00

abstract：:Discoidin I expression was used as a marker to screen for mutants affected in the growth-differentiation transition (GDT) of Dictyostelium. By REMI mutagenesis we have isolated mutant 2-9, an overexpressor of discoidin I. It displays normal morphogenesis but shows premature entry into the developmental cycle. The disr...

journal_title：Molecular biology of the cell

authors： Zeng C,Anjard C,Riemann K,Konzok A,Nellen W

更新日期：2000-05-01 00:00:00

abstract：:In animal cells, positioning of the mitotic spindle is crucial for defining the plane of cytokinesis and the size ratio of daughter cells. We have characterized this phenomenon in a rat epithelial cell line using microscopy, micromanipulation, and microinjection. Unmanipulated cells position the mitotic spindle near t...

journal_title：Molecular biology of the cell

authors： O'Connell CB,Wang YL

更新日期：2000-05-01 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

authors： Tasker M,Wilson J,Sarkar M,Hendriks E,Matthews K

更新日期：2000-05-01 00:00:00

abstract：:GPI-linked hemagglutinin (GPI-HA) of influenza virus was thought to induce hemifusion without pore formation. Cells expressing either HA or GPI-HA were bound to red blood cells, and their fusion was compared by patch-clamp capacitance measurements and fluorescence microscopy. It is now shown that under more optimal fu...

journal_title：Molecular biology of the cell

authors： Markosyan RM,Cohen FS,Melikyan GB

更新日期：2000-04-01 00:00:00

abstract：:In vitro studies suggest that the Barren protein may function as an activator of DNA topoisomerase II and/or as a component of the Xenopus condensin complex. To better understand the role of Barren in vivo, we generated conditional alleles of the structural gene for Barren (BRN1) in Saccharomyces cerevisiae. We show t...

journal_title：Molecular biology of the cell

authors： Lavoie BD,Tuffo KM,Oh S,Koshland D,Holm C

更新日期：2000-04-01 00:00:00

abstract：:The engagement of integrin alpha7 in E63 skeletal muscle cells by laminin or anti-alpha7 antibodies triggered transient elevations in the intracellular free Ca(2+) concentration that resulted from both inositol triphosphate-evoked Ca(2+) release from intracellular stores and extracellular Ca(2+) influx through voltage...

journal_title：Molecular biology of the cell

authors： Kwon MS,Park CS,Choi K,Ahnn J,Kim JI,Eom SH,Kaufman SJ,Song WK

更新日期：2000-04-01 00:00:00

abstract：:A cell fraction that would today be termed "the nuclear matrix" was first described and patented in 1948 by Russian investigators. In 1974 this fraction was rediscovered and promoted as a fundamental organizing principle of eukaryotic gene expression. Yet, convincing evidence for this functional role of the nuclear ma...

journal_title：Molecular biology of the cell

authors： Pederson T

更新日期：2000-03-01 00:00:00

abstract：:Apoptosis causes characteristic morphological changes in cells, including membrane blebbing, cell detachment from the extracellular matrix, and loss of cell-cell contacts. We investigated the changes in focal adhesion proteins during etoposide-induced apoptosis in Rat-1 cells and found that during apoptosis, p130cas (...

journal_title：Molecular biology of the cell

authors： Kook S,Shim SR,Choi SJ,Ahnn J,Kim JI,Eom SH,Jung YK,Paik SG,Song WK

更新日期：2000-03-01 00:00:00

abstract：:Dog thyroid epithelial cells in primary culture constitute a physiologically relevant model of positive control of DNA synthesis initiation and G0-S prereplicative phase progression by cAMP as a second messenger for thyrotropin (thyroid-stimulating hormone [TSH]). As previously shown in this system, the cAMP-dependent...

journal_title：Molecular biology of the cell

authors： Depoortere F,Pirson I,Bartek J,Dumont JE,Roger PP

更新日期：2000-03-01 00:00:00

abstract：:In many insects, development of the oocyte arrests temporarily just before vitellogenesis, the period when vitellogenins (yolk proteins) accumulate in the oocyte. Following hormonal and environmental cues, development of the oocyte resumes, and endocytosis of vitellogenins begins. An essential component of yolk uptake...

journal_title：Molecular biology of the cell

authors： Schonbaum CP,Perrino JJ,Mahowald AP

更新日期：2000-02-01 00:00:00

abstract：:Biochemical data have shown that COPI-coated vesicles are tethered to Golgi membranes by a complex of at least three proteins: p115, giantin, and GM130. p115 binds to giantin on the vesicles and to GM130 on the membrane. We now examine the function of this tethering complex in vivo. Microinjection of an N-terminal pep...

journal_title：Molecular biology of the cell

authors： Seemann J,Jokitalo EJ,Warren G

更新日期：2000-02-01 00:00:00

abstract：:In the yeast Saccharomyces cerevisiae, Cdc24p functions at least in part as a guanine-nucleotide-exchange factor for the Rho-family GTPase Cdc42p. A genetic screen designed to identify possible additional targets of Cdc24p instead identified two previously known genes, MSB1 and CLA4, and one novel gene, designated MSB...

journal_title：Molecular biology of the cell

authors： Bi E,Chiavetta JB,Chen H,Chen GC,Chan CS,Pringle JR

更新日期：2000-02-01 00:00:00

abstract：:Despite the importance of epithelial cell contacts in determining cell behavior, we still lack a detailed understanding of the assembly and disassembly of intercellular contacts. Here we examined the role of the catalytic activity of the Src family kinases at epithelial cell contacts in vitro. Like E- and P-cadherin, ...

journal_title：Molecular biology of the cell

authors： Owens DW,McLean GW,Wyke AW,Paraskeva C,Parkinson EK,Frame MC,Brunton VG

更新日期：2000-01-01 00:00:00

abstract：:Pro-alpha-factor (pro-alphaf) is posttranslationally modified in the yeast Golgi complex by the addition of alpha1,6-, alpha1,2-, and alpha1,3-linked mannose to N-linked oligosaccharides and by a Kex2p-initiated proteolytic processing event. Previous work has indicated that the alpha1,6- and alpha1,3-mannosylation and...

journal_title：Molecular biology of the cell

authors： Brigance WT,Barlowe C,Graham TR

更新日期：2000-01-01 00:00:00

abstract：:The late Golgi of the yeast Saccharomyces cerevisiae receives membrane traffic from the secretory pathway as well as retrograde traffic from post-Golgi compartments, but the machinery that regulates these vesicle-docking and fusion events has not been characterized. We have identified three components of a novel prote...

journal_title：Molecular biology of the cell

authors： Conibear E,Stevens TH

更新日期：2000-01-01 00:00:00

abstract：:Evidence has been presented both for and against obligate retrograde movement of resident Golgi proteins through the endoplasmic reticulum (ER) during nocodazole-induced Golgi ministack formation. Here, we studied the nocodazole-induced formation of ministacks using phospholipase A(2) (PLA(2)) antagonists, which have ...

journal_title：Molecular biology of the cell

authors： Drecktrah D,Brown WJ

更新日期：1999-12-01 00:00:00

abstract：:The putative role of sorting early endosomes (EEs) in synaptic-like microvesicle (SLMV) formation in the neuroendocrine PC12 cell line was investigated by quantitative immunoelectron microscopy. By BSA-gold internalization kinetics, four distinct endosomal subcompartments were distinguished: primary endocytic vesicles...

journal_title：Molecular biology of the cell

authors： de Wit H,Lichtenstein Y,Geuze HJ,Kelly RB,van der Sluijs P,Klumperman J

更新日期：1999-12-01 00:00:00

abstract：:The Caenorhabditis elegans oocyte is a highly amenable system for forward and reverse genetic analysis of receptor-mediated endocytosis. We describe the use of transgenic strains expressing a vitellogenin::green fluorescent protein (YP170::GFP) fusion to monitor yolk endocytosis by the C. elegans oocyte in vivo. This ...

journal_title：Molecular biology of the cell

authors： Grant B,Hirsh D

更新日期：1999-12-01 00:00:00

abstract：:Severe heat stress causes protein denaturation in various cellular compartments. If Saccharomyces cerevisiae cells grown at 24 degrees C are preconditioned at 37 degrees C, proteins denatured by subsequent exposure to 48-50 degrees C can be renatured when the cells are allowed to recover at 24 degrees C. Conformationa...

journal_title：Molecular biology of the cell

authors： Hänninen AL,Simola M,Saris N,Makarow M

更新日期：1999-11-01 00:00:00

abstract：:Several membrane-associating signals, including covalently linked fatty acids, are found in various combinations at the N termini of signaling proteins. The function of these combinations was investigated by appending fatty acylated N-terminal sequences to green fluorescent protein (GFP). Myristoylated plus mono/dipal...

journal_title：Molecular biology of the cell

authors： McCabe JB,Berthiaume LG

更新日期：1999-11-01 00:00:00

abstract：:Alternative pre-mRNA splicing patterns can change an extracellular stimulus, but the signaling pathways leading to these changes are still poorly characterized. Here, we describe a tyrosine-phosphorylated nuclear protein, YT521-B, and show that it interacts with the nuclear transcriptosomal component scaffold attachme...

journal_title：Molecular biology of the cell

authors： Hartmann AM,Nayler O,Schwaiger FW,Obermeier A,Stamm S

更新日期：1999-11-01 00:00:00

abstract：:Cyclin D1 expression is jointly regulated by growth factors and cell adhesion to the extracellular matrix in many cell types. Growth factors are thought to regulate cyclin D1 expression because they stimulate sustained extracellular signal-regulated kinase (ERK) activity. However, we show here that growth factors indu...

journal_title：Molecular biology of the cell

authors： Roovers K,Davey G,Zhu X,Bottazzi ME,Assoian RK

更新日期：1999-10-01 00:00:00

abstract：:Fission yeast rad22(+), a homologue of budding yeast RAD52, encodes a double-strand break repair component, which is dispensable for proliferation. We, however, have recently obtained a cell division cycle mutant with a temperature-sensitive allele of rad22(+), designated rad22-H6, which resulted from a point mutation...

journal_title：Molecular biology of the cell

authors： Suto K,Nagata A,Murakami H,Okayama H

更新日期：1999-10-01 00:00:00

abstract：:Integrin-mediated adhesion induces several signaling pathways leading to regulation of gene transcription, control of cell cycle entry and survival from apoptosis. Here we investigate the involvement of the Janus kinase (JAK)/signal transducers and activators of transcription (STAT) pathway in integrin-mediated signal...

journal_title：Molecular biology of the cell

authors： Brizzi MF,Defilippi P,Rosso A,Venturino M,Garbarino G,Miyajima A,Silengo L,Tarone G,Pegoraro L

更新日期：1999-10-01 00:00:00

abstract：:We have identified a novel Ras-interacting protein from Dictyostelium, RIP3, whose function is required for both chemotaxis and the synthesis and relay of the cyclic AMP (cAMP) chemoattractant signal. rip3 null cells are unable to aggregate and lack receptor activation of adenylyl cyclase but are able, in response to ...

journal_title：Molecular biology of the cell

authors： Lee S,Parent CA,Insall R,Firtel RA

更新日期：1999-09-01 00:00:00

abstract：:The efficient activation of p90(rsk) by MAP kinase requires their interaction through a docking site located at the C-terminal end of p90(rsk). The MAP kinase p42(mpk1) can associate with p90(rsk) in G(2)-arrested but not in mature Xenopus oocytes. In contrast, an N-terminally truncated p90(rsk) mutant named D2 consti...

journal_title：Molecular biology of the cell

authors： Gavin AC,Ni Ainle A,Chierici E,Jones M,Nebreda AR

更新日期：1999-09-01 00:00:00

abstract：:In complex with FKBP12, the immunosuppressant rapamycin binds to and inhibits the yeast TOR1 and TOR2 proteins and the mammalian homologue mTOR/FRAP/RAFT1. The TOR proteins promote cell cycle progression in yeast and human cells by regulating translation and polarization of the actin cytoskeleton. A C-terminal domain ...

journal_title：Molecular biology of the cell

authors： Alarcon CM,Heitman J,Cardenas ME

更新日期：1999-08-01 00:00:00

abstract：:Werner syndrome (WS) is a human progeroid syndrome characterized by the early onset of a large number of clinical features associated with the normal aging process. The complex molecular and cellular phenotypes of WS involve characteristic features of genomic instability and accelerated replicative senescence. The gen...

journal_title：Molecular biology of the cell

authors： Balajee AS,Machwe A,May A,Gray MD,Oshima J,Martin GM,Nehlin JO,Brosh R,Orren DK,Bohr VA

更新日期：1999-08-01 00:00:00

abstract：:The immunoglobulin (Ig) molecule is composed of two identical heavy chains and two identical light chains (H2L2). Transport of this heteromeric complex is dependent on the correct assembly of the component parts, which is controlled, in part, by the association of incompletely assembled Ig heavy chains with the endopl...

journal_title：Molecular biology of the cell

authors： Lee YK,Brewer JW,Hellman R,Hendershot LM

更新日期：1999-07-01 00:00:00

abstract：:The cytoskeleton plays an important role in neuronal morphogenesis. We have identified and characterized a novel actin-binding protein, termed Mayven, predominantly expressed in brain. Mayven contains a BTB (broad complex, tramtrack, bric-a-brac)/POZ (poxvirus, zinc finger) domain-like structure in the predicted N ter...

journal_title：Molecular biology of the cell

authors： Soltysik-Espanola M,Rogers RA,Jiang S,Kim TA,Gaedigk R,White RA,Avraham H,Avraham S

更新日期：1999-07-01 00:00:00

abstract：:An increase in the level of active, GTP-bound Ras is not necessary for transformation of chicken embryo fibroblasts (CEF) by v-Src. This suggests that other Ras-independent pathways contribute to transformation by v-Src. To address the possibility that activation of phosphatidylinositol-3-kinase (PI3K) and the mammali...

journal_title：Molecular biology of the cell

authors： Penuel E,Martin GS

更新日期：1999-06-01 00:00:00

abstract：:Rab2 immunolocalizes to pre-Golgi intermediates (vesicular-tubular clusters [VTCs]) that are the first site of segregation of anterograde- and retrograde-transported proteins and a major peripheral site for COPI recruitment. Our previous work showed that Rab2 Q65L (equivalent to Ras Q61L) inhibited endoplasmic reticul...

journal_title：Molecular biology of the cell

authors： Tisdale EJ

更新日期：1999-06-01 00:00:00

abstract：:Eukaryotic cells actively block entry into mitosis in the presence of DNA damage or incompletely replicated DNA. This response is mediated by signal transduction cascades called cell cycle checkpoints. We show here that the human checkpoint control protein hRAD9 physically associates with two other checkpoint control ...

journal_title：Molecular biology of the cell

authors： St Onge RP,Udell CM,Casselman R,Davey S

更新日期：1999-06-01 00:00:00