Ion antagonism in phytochrome-mediated calcium-dependent germination of turions of Spirodela polyrhiza (L.) Schleiden

Planta ◽  
1999 ◽  
Vol 208 (4) ◽  
pp. 583-587 ◽  
Author(s):  
Klaus-J. Appenroth ◽  
Halina Gabrys ◽  
Robert W. Scheuerlein
Keyword(s):  
Spirodela Polyrhiza ◽  
Calcium Dependent ◽  
Ion Antagonism

Genomic analysis of C-type lectins

2002 ◽  
Vol 69 ◽  
pp. 59-72 ◽  
Author(s):  
Kurt Drickamer ◽  
Andrew J. Fadden
Keyword(s):  
Biological Effects ◽  
Cell Signalling ◽  
Genomic Analysis ◽  
Binding Activity ◽  
Immunoglobulin Superfamily ◽  
Carbohydrate Binding ◽  
Carbohydrate Recognition ◽  
Calcium Dependent ◽  
Binding Domains ◽  
Carbohydrate Recognition Domains

Many biological effects of complex carbohydrates are mediated by lectins that contain discrete carbohydrate-recognition domains. At least seven structurally distinct families of carbohydrate-recognition domains are found in lectins that are involved in intracellular trafficking, cell adhesion, cell–cell signalling, glycoprotein turnover and innate immunity. Genome-wide analysis of potential carbohydrate-binding domains is now possible. Two classes of intracellular lectins involved in glycoprotein trafficking are present in yeast, model invertebrates and vertebrates, and two other classes are present in vertebrates only. At the cell surface, calcium-dependent (C-type) lectins and galectins are found in model invertebrates and vertebrates, but not in yeast; immunoglobulin superfamily (I-type) lectins are only found in vertebrates. The evolutionary appearance of different classes of sugar-binding protein modules parallels a development towards more complex oligosaccharides that provide increased opportunities for specific recognition phenomena. An overall picture of the lectins present in humans can now be proposed. Based on our knowledge of the structures of several of the C-type carbohydrate-recognition domains, it is possible to suggest ligand-binding activity that may be associated with novel C-type lectin-like domains identified in a systematic screen of the human genome. Further analysis of the sequences of proteins containing these domains can be used as a basis for proposing potential biological functions.

Antifungal alkaloids from Agelas Citrina that decouple calcium-dependent excitation-contraction

Planta Medica ◽  
2012 ◽  
Vol 78 (11) ◽  
Author(s):  
TF Molinski ◽  
EP Stout ◽  
LCY Yu ◽  
KM Truong ◽  
IN Pessah
Keyword(s):  
Calcium Dependent

Calcium-dependent release of adipocyte fatty acid binding protein from human adipocytes

2014 ◽  
Vol 122 (03) ◽  
Author(s):  
I Schlottmann ◽  
M Ehrhart-Bornstein ◽  
M Wabitsch ◽  
SR Bornstein ◽  
V Lamounier-Zepter
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Binding Protein ◽  
Binding Protein ◽  
Human Adipocytes ◽  
Fatty Acid Binding ◽  
Calcium Dependent ◽  
Acid Binding Protein

Glycoproteins IIb and IIIa and Platelet Thrombospondin in a Liposome Model of Platelet Aggregation

1986 ◽  
Vol 55 (02) ◽  
pp. 240-245 ◽  
Author(s):  
M E Rybak
Keyword(s):  
Platelet Aggregation ◽  
Direct Evidence ◽  
Phospholipid Vesicles ◽  
Aggregate Formation ◽  
Membrane Glycoproteins ◽  
Protein Orientation ◽  
Phosphatidylcholine Liposomes ◽  
Calcium Dependent ◽  
Lentil Lectin ◽  
Complete Reversal

SummaryPlatelet membrane glycoproteins IIb and IIIa and platelet thrombospondin were incorporated onto phosphatidylcholine liposomes, by freeze thawing and sonication. Protein orientation on the liposomes was confirmed by susceptibility to neuraminidase cleavage and binding to lentil lectin-Sepharose (GPIIb-IIIa liposomes) and to heparin-Sepharose (thrombospondin liposomes). Glycoproteins Ilb-IIIa bound 125I-fibrinogen with Kd of 7.5 × 10™7M. Binding was reversible and calcium-dependent. Ilb-IIIa liposomes underwent fibrinogen-dependent aggregation in the presence of 10 mM CaCl2. Maximal aggregate formation was observed with a combination of IIb-IIIa liposomes and thrombospondin liposomes. This aggregation was partially inhibited by preincubation with monoclonal antibodies to the IIb-IIIa complex. Addition of EDTA caused complete reversal of aggregates. Thrombospondin liposomes also underwent fibrinogen and calcium dependent aggregation, however, this aggregation was less than that observed with the GPIIb-IIIa liposomes. Maximal aggregate formation was observed with a mixture of IIb-IIIa liposomes and thrombospondin liposomes. These studies demonstrate that GPIIb-IIIa and thrombospondin can be incorporated into phospholipid vesicles with preservation of function. Direct evidence is provided to demonstrate that glycoprotein lib and Ilia and fibrinogen are sufficient for platelet aggregation and to demonstrate that thrombospondin may also contribute to platelet aggregation.

Calcium-Dependent Protein Kinases (CDPK) in Abiotic Stress Tolerance

2018 ◽  
Vol 34 (2) ◽  
pp. 259-265 ◽  
Author(s):  
Hemant B Kardile ◽  
◽  
Vikrant ◽  
Nirmal Kant Sharma ◽  
Ankita Sharma ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Stress Tolerance ◽  
Protein Kinases ◽  
Abiotic Stress Tolerance ◽  
Calcium Dependent ◽  
Dependent Protein ◽  
Calcium Dependent Protein Kinases

Mislocalization of Adherens Junction- Associated Proteins in a Patient with Darier Disease

2018 ◽  
Vol 2 (3) ◽  
pp. 184-201
Author(s):  
George D Glinos ◽  
Irena Pastar ◽  
Marjana Tomic-Canic ◽  
Rivka C Stone
Keyword(s):  
Adherens Junction ◽  
Cellular Adhesion ◽  
Calcium Flux ◽  
Keratinocyte Differentiation ◽  
Calcium Dependent ◽  
Endoplasmic Reticulum Calcium ◽  
Darier Disease ◽  
Associated Proteins ◽  
Attachment Proteins ◽  
E Cadherin

Darier disease (DD) is an autosomal dominant keratinizing genodermatosis that manifests clinically with red-brown pruritic papules in a seborrheic distribution often in association with palmoplantar pits and dystrophic nail changes. It is caused by mutation in ATP2A2 which encodes a sarco/endoplasmic reticulum calcium ATPase isoform 2 (SERCA2) pump that regulates calcium flux. Consequent alteration of intracellular calcium homeostasis is thought to impair trafficking of cellular adhesion proteins and to lead to aberrant keratinocyte differentiation, contributing to the characteristic histopathologic features of acantholysis and dyskeratosis in DD, though the precise mechanisms are incompletely understood. Previous studies have identified defective localization of desmosomal attachment proteins in skin biopsies and cultured keratinocytes from DD patients, but reports of effects on adherens junction proteins (including calcium-dependent E-cadherin) are conflicting. Here we describe a case of DD presenting with characteristic clinical and histologic features in which we performed immunofluorescence staining of four adherens junction-associated proteins (E-cadherin, α-catenin, β-catenin, and vinculin). In lesional (acantholytic) DD skin, we identified loss of distinctive bright membranous staining that was present at the periphery of keratinocytes throughout the epidermis in the healthy skin of a matched donor. Perilesional (non-acantholytic) portions of DD skin partially recapitulated the normal phenotype. Our findings support a role for SERCA2 dysfunction in impaired assembly of adherens junctions, which together with defective desmosomes contribute to acantholysis in DD.

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