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  • 1
    Publication Date: 2003-09-23
    Description: Although critical for development, immunity, wound healing, and metastasis, integrins represent one of the few classes of plasma membrane receptors for which the basic signaling mechanism remains a mystery. We investigated cytoplasmic conformational changes in the integrin LFA-1 (alphaLbeta2) in living cells by measuring fluorescence resonance energy transfer between cyan fluorescent protein-fused and yellow fluorescent protein-fused alphaL and beta2 cytoplasmic domains. In the resting state these domains were close to each other, but underwent significant spatial separation upon either intracellular activation of integrin adhesiveness (inside-out signaling) or ligand binding (outside-in signaling). Thus, bidirectional integrin signaling is accomplished by coupling extracellular conformational changes to an unclasping and separation of the alpha and beta cytoplasmic domains, a distinctive mechanism for transmitting information across the plasma membrane.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, Minsoo -- Carman, Christopher V -- Springer, Timothy A -- CA31798/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2003 Sep 19;301(5640):1720-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉CBR Institute for Biomedical Research, Department of Pathology, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14500982" target="_blank"〉PubMed〈/a〉
    Keywords: Antibodies, Monoclonal ; Antigens, CD11a/*chemistry ; Antigens, CD18/*chemistry ; Bacterial Proteins ; Cell Adhesion ; Cell Membrane/*metabolism ; Chemokine CXCL12 ; Chemokines, CXC/metabolism ; Cytoplasm/*chemistry ; Dimerization ; Fluorescence Resonance Energy Transfer ; Green Fluorescent Proteins ; Humans ; Intercellular Adhesion Molecule-1/metabolism ; Ligands ; Luminescent Proteins ; Lymphocyte Function-Associated Antigen-1/chemistry/*metabolism ; Protein Conformation ; Protein Structure, Tertiary ; Receptors, CXCR4/metabolism ; Recombinant Fusion Proteins/chemistry ; *Signal Transduction ; Talin/chemistry/metabolism ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2010-08-21
    Description: Haemostasis in the arteriolar circulation mediated by von Willebrand factor (VWF) binding to platelets is an example of an adhesive interaction that must withstand strong hydrodynamic forces acting on cells. VWF is a concatenated, multifunctional protein that has binding sites for platelets as well as subendothelial collagen. Binding of the A1 domain in VWF to the glycoprotein Ib alpha subunit (GPIbalpha) on the surface of platelets mediates crosslinking of platelets to one another and the formation of a platelet plug for arterioles. The importance of VWF is illustrated by its mutation in von Willebrand disease, a bleeding diathesis. Here, we describe a novel mechanochemical specialization of the A1-GPIbalpha bond for force-resistance. We have developed a method that enables, for the first time, repeated measurements of the binding and unbinding of a receptor and ligand in a single molecule (ReaLiSM). We demonstrate two states of the receptor-ligand bond, that is, a flex-bond. One state is seen at low force; a second state begins to engage at 10 pN with a approximately 20-fold longer lifetime and greater force resistance. The lifetimes of the two states, how force exponentiates lifetime, and the kinetics of switching between the two states are all measured. For the first time, single-molecule measurements on this system are in agreement with bulk phase measurements. The results have important implications not only for how platelets bound to VWF are able to resist force to plug arterioles, but also how increased flow activates platelet plug formation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4117310/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4117310/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, Jongseong -- Zhang, Cheng-Zhong -- Zhang, Xiaohui -- Springer, Timothy A -- HL-48675/HL/NHLBI NIH HHS/ -- P01 HL048675/HL/NHLBI NIH HHS/ -- England -- Nature. 2010 Aug 19;466(7309):992-5. doi: 10.1038/nature09295.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Immune Disease Institute, Children's Hospital Boston and Department of Pathology, Harvard Medical School, 3 Blackfan Circle, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20725043" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arterioles/cytology/*physiology ; Blood Coagulation/*physiology ; Blood Platelets/chemistry/cytology/*metabolism ; Cell Line ; Hemorheology ; Humans ; Kinetics ; Ligands ; Membrane Glycoproteins/chemistry/*metabolism ; Mice ; Models, Chemical ; Models, Molecular ; Platelet Glycoprotein GPIb-IX Complex ; Protein Binding ; Protein Structure, Tertiary ; Tensile Strength ; von Willebrand Factor/chemistry/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 1991-03-29
    Description: Interactions between cytotoxic lymphocytes and their targets require the T cell antigen receptor (TCR) and the integrin lymphocyte function-associated molecule-1 (LFA-1, CD11a/CD18). LFA-1 is not constitutively avid for its counter-receptors, intercellular adhesion molecules (ICAMs)-1 and -2. Cross-linking of the TCR transiently converts LFA-1 to a high avidity state and thus provides a mechanism for regulating cellular adhesion and de-adhesion in an antigen-specific manner. Truncation of the cytoplasmic domain of the beta, but not the alpha, subunit of LFA-1 eliminated binding to ICAM-1 and sensitivity to phorbol esters. Thus, LFA-1 binding to ICAM-1 was found to be regulated by the cytoplasmic domain of the beta subunit of LFA-1.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hibbs, M L -- Xu, H -- Stacker, S A -- Springer, T A -- CA31798/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1991 Mar 29;251(5001):1611-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Blood Research, Harvard Medical School, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1672776" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; *Cell Adhesion ; Cell Adhesion Molecules/*physiology ; Cell Line ; Flow Cytometry ; Intercellular Adhesion Molecule-1 ; Lymphocyte Function-Associated Antigen-1/genetics/*physiology ; Macromolecular Substances ; Molecular Sequence Data ; Receptors, Antigen, T-Cell/*physiology ; Tetradecanoylphorbol Acetate/pharmacology ; Transfection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 1989-12-22
    Description: Granulocyte and natural killer (NK) cell Fc receptors for immunoglobulin G (CD16) differ in only a few amino acids, yet have phosphatidylinositol glycan (PIG) or polypeptide membrane anchors, respectively. Mutagenesis shows that anchoring is regulated by a serine residue near the PIG anchor attachment site in the extracellular domain. The NK cell isoform was not expressed on the surface of COS cells unless cotransfected with a subunit that was expressed in NK cells and that was identical to the gamma subunit of the high affinity IgE Fc receptor (Fc epsilon RI). However, the CD16 sequence and not expression of the gamma subunit is dominant in regulating PIG reanchoring.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hibbs, M L -- Selvaraj, P -- Carpen, O -- Springer, T A -- Kuster, H -- Jouvin, M H -- Kinet, J P -- New York, N.Y. -- Science. 1989 Dec 22;246(4937):1608-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Harvard Medical School, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2531918" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD/genetics ; Antigens, Differentiation/*genetics ; Cell Line ; Cell Membrane/immunology ; Flow Cytometry ; *Gene Expression Regulation ; Genes, Immunoglobulin ; Granulocytes/immunology ; Humans ; Immunoglobulin G ; Killer Cells, Natural/immunology ; L Cells (Cell Line)/immunology ; Mice ; Mutation ; RNA, Messenger/genetics/isolation & purification ; Receptors, Fc/*genetics ; Receptors, IgG ; Transcription, Genetic ; Transfection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-05-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Springer, Timothy A -- New York, N.Y. -- Science. 2002 May 17;296(5571):1253.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Blood Research, Harvard Medical School, Boston, MA 02115, USA. springeroffice@cbr.med.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12016298" target="_blank"〉PubMed〈/a〉
    Keywords: Allergy and Immunology/*history ; Animals ; Antibodies, Monoclonal/biosynthesis/*history/immunology ; Argentina ; England ; History, 20th Century ; History, 21st Century ; Humans ; *Hybridomas/immunology ; Nobel Prize
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2011-06-17
    Description: Transforming growth factor (TGF)-beta is stored in the extracellular matrix as a latent complex with its prodomain. Activation of TGF-beta1 requires the binding of alpha(v) integrin to an RGD sequence in the prodomain and exertion of force on this domain, which is held in the extracellular matrix by latent TGF-beta binding proteins. Crystals of dimeric porcine proTGF-beta1 reveal a ring-shaped complex, a novel fold for the prodomain, and show how the prodomain shields the growth factor from recognition by receptors and alters its conformation. Complex formation between alpha(v)beta(6) integrin and the prodomain is insufficient for TGF-beta1 release. Force-dependent activation requires unfastening of a 'straitjacket' that encircles each growth-factor monomer at a position that can be locked by a disulphide bond. Sequences of all 33 TGF-beta family members indicate a similar prodomain fold. The structure provides insights into the regulation of a family of growth and differentiation factors of fundamental importance in morphogenesis and homeostasis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4717672/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4717672/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shi, Minlong -- Zhu, Jianghai -- Wang, Rui -- Chen, Xing -- Mi, Lizhi -- Walz, Thomas -- Springer, Timothy A -- P01 HL103526/HL/NHLBI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2011 Jun 15;474(7351):343-9. doi: 10.1038/nature10152.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Immune Disease Institute, Children's Hospital Boston and Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21677751" target="_blank"〉PubMed〈/a〉
    Keywords: Activins/metabolism ; Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Antigens, Neoplasm/chemistry/metabolism ; Camurati-Engelmann Syndrome/genetics ; Cell Line ; Crystallography, X-Ray ; HEK293 Cells ; Humans ; Integrins/chemistry/metabolism ; Latent TGF-beta Binding Proteins/chemistry/metabolism ; Models, Molecular ; Molecular Sequence Data ; Multigene Family ; Mutation/genetics ; Oligopeptides/chemistry/metabolism ; Protein Structure, Tertiary ; Receptors, Transforming Growth Factor beta/chemistry/metabolism ; Swine ; Transforming Growth Factor beta1/biosynthesis/*chemistry/genetics/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 1996-07-12
    Description: Circulating lymphocytes gain access to lymph nodes owing to their ability to initiate rolling along specialized high endothelial venules (HEVs). One mechanism of rolling involves L-selectin binding to peripheral node addressin (PNAd) on HEVs. Activated platelets are shown to bind to circulating lymphocytes and to mediate rolling in HEVs, in vivo, through another molecule, P-selectin, which also interacts with PNAd. In vitro, activated platelets enhanced tethering of lymphocytes to PNAd and sustained lymphocyte rolling, even in the absence of functional L-selectin. Thus, a platelet pathway operating through P-selectin provides a second mechanism for lymphocyte delivery to HEVs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Diacovo, T G -- Puri, K D -- Warnock, R A -- Springer, T A -- von Andrian, U H -- HL48675/HL/NHLBI NIH HHS/ -- HL54936/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1996 Jul 12;273(5272):252-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Blood Research, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8662511" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Surface/*metabolism ; Blood Platelets/*physiology ; Cell Adhesion ; Cell Movement ; Endothelium, Vascular/cytology ; Humans ; L-Selectin/physiology ; Ligands ; Lymph Nodes/*blood supply/cytology ; Lymphocytes/cytology/*physiology ; Membrane Glycoproteins/metabolism ; Membrane Proteins ; Mice ; P-Selectin/metabolism ; Platelet Activation ; Receptors, Lymphocyte Homing/metabolism ; Transfection ; Tumor Cells, Cultured ; Venules/cytology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2009-06-06
    Description: Von Willebrand factor (VWF) is secreted as ultralarge multimers that are cleaved in the A2 domain by the metalloprotease ADAMTS13 to give smaller multimers. Cleaved VWF is activated by hydrodynamic forces found in arteriolar bleeding to promote hemostasis, whereas uncleaved VWF is activated at lower, physiologic shear stresses and causes thrombosis. Single-molecule experiments demonstrate that elongational forces in the range experienced by VWF in the vasculature unfold the A2 domain, and only the unfolded A2 domain is cleaved by ADAMTS13. In shear flow, tensile force on a VWF multimer increases with the square of multimer length and is highest at the middle, providing an efficient mechanism for homeostatic regulation of VWF size distribution by force-induced A2 unfolding and cleavage by ADAMTS13, as well as providing a counterbalance for VWF-mediated platelet aggregation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2753189/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2753189/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Xiaohui -- Halvorsen, Kenneth -- Zhang, Cheng-Zhong -- Wong, Wesley P -- Springer, Timothy A -- HL-48675/HL/NHLBI NIH HHS/ -- P01 HL048675/HL/NHLBI NIH HHS/ -- P01 HL048675-16/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2009 Jun 5;324(5932):1330-4. doi: 10.1126/science.1170905.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Immune Disease Institute, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19498171" target="_blank"〉PubMed〈/a〉
    Keywords: ADAM Proteins/*metabolism ; Binding Sites ; Blood Coagulation/physiology ; *Hemostasis ; Humans ; Kinetics ; *Mechanical Phenomena ; Optical Tweezers ; Platelet Aggregation ; Protein Conformation ; Protein Folding ; Protein Multimerization ; Protein Structure, Tertiary ; Stress, Mechanical ; Thermodynamics ; von Willebrand Factor/*chemistry/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 1987-09-04
    Description: A novel mobilizable intracellular compartment was identified in human neutrophils by latent alkaline phosphatase activity. This compartment is mobilized to the plasma membrane much more readily than any identified granule subset and has kinetics of up-regulation in the membrane similar to those reported for a variety of receptor proteins. Triton X-100 permeabilization of both intact human neutrophils and subcellular fractions obtained by density-gradient centrifugation revealed that 70 percent of the alkaline phosphatase is located in an intracellular compartment distinct from primary, secondary, and gelatinase granules and from the plasma membrane. This compartment fully translocates to the plasma membrane after stimulation with nanomolar concentrations of the chemotactic peptide N-formylmethionylleucylphenylalanine.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Borregaard, N -- Miller, L J -- Springer, T A -- CA 31799/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1987 Sep 4;237(4819):1204-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3629236" target="_blank"〉PubMed〈/a〉
    Keywords: Alkaline Phosphatase/*blood ; Cell Membrane/enzymology ; Cell Separation ; *Chemotaxis, Leukocyte ; Cytoplasmic Granules/enzymology ; Humans ; N-Formylmethionine Leucyl-Phenylalanine/*pharmacology ; Neutrophils/drug effects/enzymology/*physiology ; Subcellular Fractions/enzymology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 278 (1987), S. 99-116 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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