Abstract：
:High-speed centrifugation supernatants from slime mould plasmodia show considerable activities to inhibit the polymerization of actin as revealed by viscosity measurements. By following increasing inhibitory activities an actin modulating protein (AM-protein) has been isolated and purified which affects the polymer state of actin. AM-protein has a peptide chain weight of 42 000 and is thus indistinguishable from actin by SDS-electrophoresis, but can be clearly distinguished by isoelectric focussing. Peptide maps from partial proteolytic digests of AM-protein and Physarum actin reveal no similarities thereby excluding that AM-protein is a denatured or modified form of actin. The protein is isolated from crude extracts as a heterodimer with actin to which it strongly binds. This heterodimer affects the polymerization of large amounts of actin by inducing oligomeric or low-polymer actin complexes and thus inhibiting the formation of long actin filaments. The AM-protein/actin heterodimer has only a slight effect of F-actin. It partially depolymerized F-actin within several hours. By ion exchange chromatography in 8 M urea the AM-protein is separated from the actin. The purified AM-protein monomer is renatured and inhibits the polymerization of actin like the heterodimer but additionally, depolymerizes actin filaments very rapidly and effectively by breaking them into oligomer or low-polymer complexes. The addition of less than 1% AM-protein causes a decrease of the specific viscosity of an F-actin solution by 50%. The degree of polymerization inhibition and depolymerization of actin is strictly dependent on the amount of AM-protein added; therefore a catalytic type of reaction between both proteins can be excluded.
journal_name
Eur J Cell Bioljournal_title
European journal of cell biologyauthors
Hinssen Hsubject
Has Abstractpub_date
1981-02-01 00:00:00pages
225-33issue
2eissn
0171-9335issn
1618-1298journal_volume
23pub_type
杂志文章abstract：:Malignant melanoma is an aggressive form of skin cancer with an increasing incidence worldwide. One way to address the pathology of the disease is through molecular research. In addition to the analysis of melanoma-relevant signaling pathways, the investigation of important transcription factors is a fundamental objec...
journal_title：European journal of cell biology
pub_type： 杂志文章,评审
doi：10.1016/j.ejcb.2013.10.003
更新日期：2014-01-01 00:00:00
abstract：:Interleukin-1 beta (Il-1 beta) and interleukin-1 alpha (Il-1 alpha) were shown to act as motility factors for the human breast carcinoma cell lines SK-BR-3 and ZR-75-1 in vitro. Both cytokines induced transition from the stationary to the motile phenotype (spreading). Il-1 beta stimulated translocation, shape change a...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1992-12-01 00:00:00
abstract：:This study reports the ultrastructural detection of fucosyl residues at the surface of axenically grown roots of Zea mays. The method used involved sequential binding of UeA lectin to the root and coupling of the bound UeA with fucosyl ferritin. Superficial dense ferritin labelling was found in the slime droplet enshe...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1984-05-01 00:00:00
abstract：:We examined the Ca2+ handling property and cell function of CCL39 fibroblasts highly overexpressing the cardiac isoform (NCX1) of Na+/ Ca2+ exchanger. In NCX1 transfectants in 146 mM Na+, ionomycin, alpha-thrombin or thapsigargin only produced a small transient increase in [Ca2+]i compared to the large increase seen i...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：10.1016/S0171-9335(98)80038-1
更新日期：1998-07-01 00:00:00
abstract：:Polycationic derivatives of ferritin containing primary amino groups (CFah) or tertiary amino groups (CFdmp) were potent platelet agonists inducing shape change, aggregation and secretion, but also agglutination in the presence of EDTA. Pretreatment of platelets with neuraminidase, PGE1, indomethacin, or creatine kina...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1986-03-01 00:00:00
abstract：:Cytochrome b5 has been visualized by an immunoferritin labeling in a Golgi preparation. When the Golgi apparatus was first disrupted before labeling, 60% of the profiles were clearly labeled with ferritin. This proportion of labeled vesicles was too high to be explained by contamination from other membranes. When the ...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1982-11-01 00:00:00
abstract：:This paper explores the mode of action of the tranquillizers chloral hydrate and diazepam during fertilization and mitosis of the first reproductive cell cycles in sea urchin eggs. Most striking effects of these drugs are the alteration of centrosomal material and the abnormal microtubule configurations during exposur...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：10.1016/S0171-9335(98)80041-1
更新日期：1998-01-01 00:00:00
abstract：:The COP9 signalosome (CSN) is an evolutionarily conserved multiprotein complex with a role in the regulation of cullin-RING type E3 ubiquitin ligases (CRLs). CSN exerts its function on E3 ligases by deconjugating the ubiquitin-related protein NEDD8 from the CRL cullin subunit. Thereby, CSN has an impact on multiple CR...
journal_title：European journal of cell biology
pub_type： 杂志文章,评审
doi：10.1016/j.ejcb.2009.11.021
更新日期：2010-02-01 00:00:00
abstract：:Centaurin alpha-1 is a high-affinity PtdIns(3,4,5)P3-binding protein enriched in brain. Sequence analysis indicates centaurin alpha-1 contains two pleckstrin homology domains, ankyrin repeats and an Arf GAP homology domain, placing it in the AZAP family of phosphoinositide-regulated Arf GAPs. Other members of this fam...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：10.1078/0171-9335-00416
更新日期：2004-10-01 00:00:00
abstract：:We describe here the cloning, expression and characterisation of centaurin-alpha2 from a rat adipocyte cDNA library. The centaurin-alpha2 cDNA contains an open reading frame, which codes for a protein of 376 amino acids with predicted mass of 43.5 kDa. Centaurin-alpha2 shares 51-59% identity with centaurin-alpha1 prot...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：10.1078/0171-9335-00242
更新日期：2002-04-01 00:00:00
abstract：:The docking complex of peroxisomal matrix protein import is composed of PEX13 and PEX14 in all species analyzed so far, whereas only yeast appears to possess an additional component, PEX17. In this report we isolated PEX14 complexes of Neurospora crassa. Among the complex constituents, one protein designated as PEX33 ...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：10.1016/j.ejcb.2010.07.003
更新日期：2010-12-01 00:00:00
abstract：:Extraovarian estrogen production is localized mainly in stromal vascular cells from adipose tissue, which contain the aromatase activity necessary for the conversion of androgens to estrogens. Induction of aromatase activity in these cells by glucocorticoids occurs only in the presence of a serum factor, the propertie...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1994-02-01 00:00:00
abstract：:To study molecules secreted from cultured plant cells that promote development, maize microspores were transferred into culture and the conditioned media were collected over time and analysed. Electrophoresis indicated that both non-glycosylated and glycosylated proteins including arabinogalactan proteins (AGPs) appea...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：10.1078/0171-9335-00378
更新日期：2004-07-01 00:00:00
abstract：:Invadopodia are actin-rich, adhesive protrusions that extend into and remodel the extracellular matrix. They are associated with high levels of pericellular proteolysis and correlate with the invasive capacity of a variety of tumour cells. Invadopodia have, thus, been proposed to recapitulate key events of the metasta...
journal_title：European journal of cell biology
pub_type： 杂志文章,评审
doi：10.1016/j.ejcb.2010.04.007
更新日期：2011-02-01 00:00:00
abstract：:Centromeres support the assembly of the kinetochore on every chromosome and are therefore essential for the proper segregation of sister chromatids during cell division. Centromere identity is regulated epigenetically through the presence of the histone H3 variant CENP-A. CENP-A regulation and incorporation specifical...
journal_title：European journal of cell biology
pub_type： 杂志文章,评审
doi：10.1016/j.ejcb.2011.04.016
更新日期：2011-10-01 00:00:00
abstract：:During maize pollen embryogenesis, a range of multicellular structures are formed. Using different approaches, the "nature" of these structures has been determined in terms of their embryogenic potential. In situ molecular identification techniques for gene transcripts and products, and a novel cell tracking system in...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：10.1016/j.ejcb.2005.02.002
更新日期：2005-07-01 00:00:00
abstract：:In Euplotes crassus, the ampules which occur in groups that surround the cilia at their base are organelles which, unlike the extrusomes such as mucocysts and trichocysts, persist inside the cytoplasm and are not lost after discharge. By freeze-fracturing cells, we found membrane specializations denoted by the presenc...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1981-02-01 00:00:00
abstract：:ATP-dependent interactions between myosin and actin in the lower eukaryote, Physarum polycephalum, are inhibited by micromolar levels of Ca2+. This inhibition is mediated by the binding of Ca2+ to myosin, the phosphorylation of which is required if Ca2+ is to inhibit the activities of myosin (Kohama, K., Trends Pharma...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1991-10-01 00:00:00
abstract：:When resting human blood platelets are stimulated with thrombin, 50 to 60% of the G-actin polymerizes to F-actin within 60 seconds. The increase in F-actin is correlated with a corresponding decrease in the complex of G-actin with T beta 4. Within 5 seconds after stimulation, nucleation sites for pyrene actin polymeri...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1993-08-01 00:00:00
abstract：:Initial integrin-mediated cell-matrix adhesions (focal complexes) appear underneath the lamellipodia, in the regions of the "fast" centripetal flow driven by actin polymerization. Once formed, these adhesions convert the flow behind them into a "slow", myosin II-driven mode. Some focal complexes then turn into elongat...
journal_title：European journal of cell biology
pub_type： 杂志文章,评审
doi：10.1016/j.ejcb.2005.11.001
更新日期：2006-04-01 00:00:00
abstract：:Etoposide induced a megabase (Mb) fragmentation pattern identical with that from genomic digestion by NotI restriction endonuclease which specifically cleaves CpG islands in euchromatin domains. Redigestion by NotI produced no change, suggesting cleavage in the same or closely related sites in euchromatin domains. Pre...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：10.1016/S0171-9335(98)80112-X
更新日期：1998-11-01 00:00:00
abstract：:The 90-kDa heat-shock protein, hsp90, is an abundant and conserved protein located predominantly in the cytoplasm. Previous reports have localized a portion of the hsp90 to microtubules and to microfilaments. Here, we show that colocalization of hsp90 with microtubules is seen after long-term but not short-term fixati...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1996-08-01 00:00:00
abstract：:Perfused Chara cells capable of resuming ATP-dependent cytoplasmic streaming in low free Ca++ solutions have been examined by electron microscopy for myosin-like filaments. Filaments 44 nm in diameter and up to 3 micron in length have been found associated with the endoplasmic reticulum that along with mitochondria, m...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1979-12-01 00:00:00
abstract：:A new perfusion medium for isolating cardiac myocytes from adult rats was developed, thereby yielding numerous viable cells with few morphological changes. The main factors in the isolation procedure are Ca2+ deficiency, collagenase, and mechanical dispersion. Their effects on the ultrastructure of cardiac myocytes we...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1982-06-01 00:00:00
abstract：:Gap junctions are known to play a role in the control of cell proliferation, and connexins (Cx) are considered to be tumor suppressors. However, the effects of Cx on cell proliferation are dependent on the Cx which is expressed and on the cell type under consideration. We previously found that restoration of cell-to-c...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：10.1078/0171-9335-00245
更新日期：2002-05-01 00:00:00
abstract：:By comparison of the cDNA-derived amino acid sequences and the cell type-specific patterns of synthesis we have identified desmocollin Dsc2 as the most widespread, perhaps ubiquitous desmocollin subtype. Using Northern blot analyses and ribonuclease protection assays we have found an approximately 5.6 kb mRNA encoding...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1995-01-01 00:00:00
abstract：:During endotoxic shock, the liver exerts an endotoxin (lipopolysaccharide, LPS) clearance function with the participation of both sinusoidal (mainly Kupffer and endothelial cells) and parenchymal cells. In order to determine the specificity and diversity of response of each liver cell type, the effect of Escherichia c...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1994-10-01 00:00:00
abstract：:Human gastric mucous cells - gastric cancer cell lines mucin gene expression - TNFalpha - RT-PCR immunocytochemistry Little is known on the expression pattern of mucin genes in human gastric cancer cell lines in relation to mucin expression in normal gastric epithelial cells. Thus, the aim of this study was to compare...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：10.1016/s0171-9335(99)80034-x
更新日期：1999-11-01 00:00:00
abstract：:An increase in light intensity induces a depolarization in retinal ON-bipolar cells via a reduced glutamate release from presynaptic photoreceptor cells. The underlying transduction cascade in the dendritic tips of ON-bipolar cells involves mGluR6 glutamate receptors signaling to TRPM1 proteins that are an indispensab...
journal_title：European journal of cell biology
pub_type： 杂志文章,评审
doi：10.1016/j.ejcb.2015.06.005
更新日期：2015-07-01 00:00:00
abstract：:A new, two step method is described for the isolation of megakaryocytes from bone marrow. By means of centrifugation in a PercollR density gradient megakaryocytes can be enriched by factor 68 or 24 starting from rat or guinea pig bone marrow, respectively. The purity of the megakaryocytes can be improved ca. 4 fold if...
journal_title：European journal of cell biology
pub_type： 杂志文章
doi：
更新日期：1980-06-01 00:00:00
