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Topic: G protein

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In the News (Wed 21 Aug 19)

  G Protein
The nature of the cascade activated by this protein in response to stresses is under investigation.
FlhF resembles some of the proteins of the Signal Recognition Particle pathway of membrane protein translocation, and may work in conjunction with this pathway to transport FliF (the first protein in flagellar synthesis) to a specific spot on the cell membrane.
As placement of proteins in specific cellular locations is critical to cell function, the results should provide insights in a phenomenon of general importance.
www.stanford.edu /~amatin/MatinLabHomePage/G_Protein.htm   (282 words)

 Human Protein Atlas
The human protein atlas shows expression and localization of proteins in a large variety of normal human tissues, cancer cells and cell lines with the aid of immunohistochemistry (IHC) images.
Protein Array-data and Western Blot-data have been added.
A new feature has been added to allow the possibility to search for proteins with specific expression patterns in normal and/or cancer tissues.
www.proteinatlas.org   (192 words)

 The Protein Society: www.proteinsociety.org
The Protein Society welcomes individuals devoted to furthering research and development in protein science to apply for a regular or corporate membership.
Members have an opportunity to actively participate in the emerging fields of protein science including proteomics, bioinformatics, structural biology, and computational biology as they pertain to proteins at the molecular and cellular level.
Protein Science is dedicated to research on all scientific aspects of protein molecules.
www.proteinsociety.org   (473 words)

 Whey Protein Resource- Since 1995
Whey protein is an essential part of a healthy lifestyle.
However, you should understand how whey protein works, and how it can help you to take full advantage of the results that using whey can give you.
Anyone can use whey protein at any age; the benefits range from bone health, to boosting your immune system system, and sports nutrition.
www.wheyprotein.org   (152 words)

 G protein definition - Medical Dictionary definitions of popular medical terms easily defined on MedTerms
G protein: These molecules have been described as "biological traffic lights." Located inside the cell, G proteins are able respond to signals outside the cell -- light, smell, hormones -- and translate (transduce) these signals into action within the cell.
Alfred G. Gilman and Martin Rodbell shared the 1994 Nobel Prize in Physiology or Medicine for "their discovery of G- proteins and the role of these proteins in signal transduction in cells."
Blood Protein Could Predict ICU Patients' Death Risk
www.medterms.com /script/main/art.asp?articlekey=6517   (173 words)

  G Protein-coupled Receptors - Novartis.com
G Protein-coupled Receptors (GPCR) represent the largest protein family in the human genome, with about 900 members in total, of which about 420 appear of relevance to pharmaceutical industry.
Our long term goal at NIBR is to identify ligands for orphan G protein-coupled receptors and to elucidate their physiological function.
Ludwig MG, Seuwen K. Characterization of the human adenylyl cyclase gene family: cDNA, gene structure, and tissue distribution of the nine isoforms.
www.nibr.novartis.com /ExpertisePlatforms/GProteinCoupledReceptors   (223 words)

In general, high biological proteins (complete proteins that contain all of the essential amino acids) come from animal sources, such as meat, fish, poultry, and eggs, (these proteins may also be referred to as complete proteins).
A variety of proteins from plants and animal sources should be consumed, to assure that the diet has an adequate amount of protein, with a balance of amino acids.
Protein intake in excess of these requirements is usually not necessary and does not seem to have any benefits for either strength or endurance training.
www.healthgoods.com /Education/Nutrition_Information/Nutrition_for_Athletes/protein.htm   (1705 words)

  G Protein Receptors   (Site not responding. Last check: 2007-10-14)
The G protein normally lies near the receptor in an inactive, quiet state.
The G protein's two states (ON or OFF) are determined by the guanine nucleotide that it binds (whence the term G protein).
This hydrolysis represents a negative feedback mechanism which ensures that the G protein is only in the active, signal- emitting ON mode for a short period of time.
web.mit.edu /esgbio/www/cb/membranes/gp.html   (1121 words)

 G Protein-Coupled Receptors : Molecular Recognition Section : NIDDK   (Site not responding. Last check: 2007-10-14)
Welcome to the G Protein-Coupled Receptor Main Page of the Molecular Recognition Section.
Although our section is mainly involved in investigating the Molecular Recognition process between purinoceptors and their ligands, we are interested in all aspects of Molecular Recognition.
purinoceptor subtypes are members of the protein family commonly known as G Protein-Coupled Receptors (GPCRs), we have collected a fair amount of data on GPCRs.
mgddk1.niddk.nih.gov /GPCR.shtml   (227 words)

 NDI Terminology - G protein-coupled receptors   (Site not responding. Last check: 2007-10-14)
G protein-linked (or coupled) receptors mediate the cellular responses to an enormous diversity of signaling molecules, including hormones, neurotransmitters, and local mediators, which are as varied in structure as they are in function: the list includes proteins and small peptides, as well as amino acid and fatty acid derivatives.
Despite the chemical and functional diversity of the signaling molecules that bind to them, all of the G protein-linked receptors whose amino acid sequences are known from DNA sequencing studies have a similar structure and are almost certainly evolutionarily related.
The members of this receptor family have conserved not only their amino acid sequence but also their functional relationship to G proteins by means of which they broadcast into the interior of the cell the message that an extracellular ligand is present.
www.ndif.org /Terms/G_protein-coupled_receptors.html   (149 words)

 Merck UK: Protein A/G Kits   (Site not responding. Last check: 2007-10-14)
Binding of protein A to the Fc region of the antibody is not affected by EDTA, non-ionic detergents, or temperatures up to 37°C. Furthermore, Protein A is easily renatured, even after treatment with 4 M urea, 6 M guanidine HCl, or 4 M thiocyanate.
Protein G or its bacterial form can be used for nearly all applications to which proteins are applied.
Protein G binds antibodies over a wide range of pH from 4.0 - 8.0, and bound antibodies can be eluted at about pH 2.5 - 3.0.
www.merckbiosciences.co.uk /html/cbc/proteinA_proteinG.htm   (447 words)

 Articles : Protein
Protein is believed to be unimportant and/or higher protein foods are avoided (such as in some fruitarian or raw food diets).
Proteins in the human body tend to have a consistent percentage of the essential amino acids.
Non-soy plant proteins have a lower percentage of at least one amino acid (in particular, beans are lower in methionine and grains are lower in lysine).
www.veganhealth.org /articles/protein   (1142 words)

When the body is in a homeostatic state, protein synthesis is equal to protein degradation and the protein requirement of the body for tissue maintenance is satisfied.
When dietary protein intake or total energy intake is inadequate to maintain tissues total nitrogen balance, negative nitrogen balance occurs and new tissue is unable to be synthesized.
Research has shown that 2.0 to 2.6 g/kg/day of protein are required for periods of very intense weight training, whereas protein intakes of 2.0 g/kg/day maintained a positive nitrogen balance during periods of less intense weight training.
www.exrx.net /Nutrition/Protein.html   (663 words)

 BioMed Central | Full text | S-Nitrosothiols modulate G protein-coupled receptor signaling in a reversible and highly ...
G protein-coupled receptors (GPCRs) represent the largest group of integral membrane proteins involved in signal transduction and are the most important targets of clinically marketed drugs [1-3].
In GSNO-treated sections, basal G protein activity was increased throughout the gray matter areas and this effect was fully reversed in the presence of excess thiol, either in the form of dithiotreitol (DTT) or reduced glutathione (GSH).
Most proteins are palmitoylated at a cysteine near the amino terminus and this modification is required for G protein targeting to lipid rafts [61] and/or normal signaling [62].
www.biomedcentral.com /1471-2121/6/21   (7313 words)

 Heterotrimeric G proteins
G proteins can be classified on the basis of differences in Ga subunit amino acid sequence, sensitivity to specific bacterial toxins (see below), and type of effector molecule(s) regulated by a particular G protein.
Elucidation of G protein a subunit (Ga) structure and function has come largely from studies involving site-directed and deletional mutatgenesis, studies of naturally occurring mutants (we shall consider one class of Gas mutation, gsp, later in this lecture), construction of chimeric a subunits, biophysical techniques (X-ray crystallography), and use of synthetic peptides.
During G protein activation, the resultant conformational changes in the a subunit are reflected in altered orientations of the switch regions.
neurobio.mcphu.edu /GalloWeb/Loudonheterotrimeric_g_proteins.htm   (1901 words)

 Energy and protein requirements
To apply the recommended safe intakes of protein to diets containing other protein sources consumed by populations throughout the world, it is necessary to consider the essential amino acid patterns provided by their mixed dietary proteins, and their availability in terms of digestibility.
Proteins and diets with an essential amino acid content and pattern that effectively meet the needs of infants and young children will also be adequate for older children and adults, whereas the converse may not be true.
The protein content of infant formulae may vary and, indeed, can be adjusted to compensate for a lower concentration of essential amino acid per unit of nitrogen, relative to that in breast milk.
www.fao.org /DOCREP/003/AA040E/AA040E08.htm   (4414 words)

 Protein A/G on Agarose or UltraLink
Protein A/G is a genetically-engineered protein that combines the IgG binding profiles of both Protein A and Protein G. It is a gene fusion product secreted from a nonpathogenic form of Bacillus.
Protein A/G is not as pH dependent as Protein A, but otherwise has the additive properties of Protein A and G. Protein A/G binds to all human IgG subclasses, making it the ideal choice for purification of polyclonal or monoclonal IgG antibodies whose subclasses have not been determined.
Protein A or Protein G. Immobilized Protein A/G products from Pierce are coupled to beads using chemistries that are leak-resistant and provide a support with minimal nonspecific binding.
www.piercenet.com /products/browse.cfm?fldID=01010321&WT.srch=1&WT.mc_id=go_ProteinAG_AG_brj   (448 words)

 The Many Faces of G Protein Signaling -- Hamm 273 (2): 669 -- Journal of Biological Chemistry
G proteins are inactive in the GDP-bound, heterotrimeric state and are activated by receptor-catalyzed guanine nucleotide
G protein is rotated 20° toward the viewer.
A regulator of a G protein signalling (RGS) gene, cag8, from the insect-pathogenic fungus Metarhizium anisopliae is involved in conidiation, virulence and hydrophobin synthesis
www.jbc.org /cgi/content/full/273/2/669   (3895 words)

 Antibody Binding to Protein A and Protein G Beads   (Site not responding. Last check: 2007-10-14)
Protein A, derived from the cell wall of Staphylococcus aureus, and protein G, derived from the cell wall of certain strains of
Protein A is a 42 kDa polypeptide that binds the residues in the CH2 and CH3 domains of immunoglobulin heavy chains.
Protein G is an approximatley 30 kDa polypeptide that binds immunoglobulins and albumin.
omrf.ouhsc.edu /~frank/ProteinA.html   (281 words)

 Protein protocols
Protein samples are mixed with acetone for a final acetone concentration of 80%.
Protein blotting involves the transfer of proteins to an immobilizing membrane.
After the separation of proteins by SDS-PAGE, the stacking gel is cut and discarded, the separating gel is briefly rinsed in distilled water 2-3 min and then equilibrated in Towbin buffer under gentle agitation during 5-10 min.
www.hos.ufl.edu /meteng/HansonWebpagecontents/Proteinprotocols.html   (1486 words)

 [No title]
G proteins and their receptors (GPCRs) form one of the most prevalent signalling systems in mammalian cells, regulating systems as diverse as sensory perception, cell growth and hormonal regulation [2].
The specific combination of subunits in heterotrimeric G proteins affects not only which receptor it can bind to, but also which downstream target is affected, providing the means to target specific physiological processes in response to specific external stimuli [5, 6].
G proteins carry lipid modifications on one or more of their subunits to target them to the plasma membrane and to contribute to protein interactions.
www.ebi.ac.uk /interpro/IEntry?ac=IPR001632   (788 words)

 Articles / Back to Genesis / 216b - Those Amazing G Protein Receptors - Institute for Creation Research
The G proteins (composed of three subunits) are intermediaries between these membrane-spanning receptors and effectors (designed to activate cellular processes).
The receptor, effector, and G proteins are all directly associated with the plasma membrane.
But how the G protein subunits are actually activated after ligands attach to the receptors forming a specific complex is not well understood.
www.icr.org /article/3125   (408 words)

 Vegetarians in Paradise/Protein Basics/Vegetarian Protein /Protein Charts/Vegan Protein/Protein Sources
One glance at restaurant menus and the plates that come to the table is proof that the centerpiece of the meal is the large serving of meat, chicken or fish frequently smothered in creamy sauces or melted cheese.
During pregnancy and breastfeeding, protein needs can easily be met by adding a little extra of the foods higher in protein, such as enriched soymilk, beans, tofu, tempeh, nuts, and nut butters in addition to a wide variety of fruits and vegetables.
While the focus on protein is important, the leafy green vegetables such as collards, kale, mustard greens, turnip greens, and spinach are also necessary for their high content of folate known to prevent neural tube defects such as spina bifida.
www.vegparadise.com /protein.html   (1502 words)

 Human G-protein Mutations -Bourne lab-
Pseudohypoparathyroidism, type I (PHP-I), is an inherited human disease caused by mutational inactivation of the alpha subunit of Gs (alpha-s), the stimulatory regulator of adenylyl cyclase.
The corresponding arginine is conserved in the alpha-2 helix of all Ga proteins.
G protein alpha subunit in its GTP-bound form, highlighting amino acids changed by point mutations that cause human endocrine diseases.
www.cmpharm.ucsf.edu /bourne/lab_science/mutations.html   (537 words)

 Signal Transduction Cascades
Protein kinases and phosphatases are themselves regulated by complex signal cascades.
Scaffold proteins often interact also with membrane constituents, elements of the cytoskeleton, and adaptors mediating recruitment into clathrin-coated vesicles.
Scaffold proteins as well as signal proteins may be recruited from the cytosol to such membrane domains in part by insertion of
www.rpi.edu /dept/bcbp/molbiochem/MBWeb/mb1/part2/signals.htm   (1495 words)

 Protein determination by the Bradford method
The Bradford is recommended for general use, especially for determining protein content of cell fractions and assesing protein concentrations for gel electrophoresis.
In assays using 5 ml color reagent prepared in lab, the sensitive range is closer to 5 to 100 µg protein.
A rapid and sensitive for the quantitation of microgram quantitites of protein utilizing the principle of protein-dye binding.
www.ruf.rice.edu /~bioslabs/methods/protein/bradford.html   (669 words)

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