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Topic: C-peptide

    Note: these results are not from the primary (high quality) database.

Peptide - Wikipedia, the free encyclopedia A peptide hormone is a peptide that acts as a hormone. One convention is that those peptide chains that are short enough to be made synthetically from the constituent amino acids are called peptides rather than proteins. Peptides (from the Greek πεπτος, "digestible"), are the family of short molecules formed from the linking, in a defined order, of various α-amino acids. en.wikipedia.org /wiki/Peptide   (657 words)

Peptide bond - Wikipedia, the free encyclopedia The wavelength of absorbance for a peptide bond is 190-230nm. The peptide bonds in proteins are metastable, meaning that in the presence of water they will break spontaneously, releasing about 10 kJ/mol of free energy, but this process is extremely slow. A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule, releasing a molecule of water (H en.wikipedia.org /wiki/Peptide_bond   (199 words)

peptide on Encyclopedia.com Among the biological peptides are many with physiological or antibacterial activity, such as the peptide hormones oxytocin and vasopressin; adrenocorticotropic hormone (ACTH), secreted by the pituitary gland; and several cyclic peptides, in which the amino-acid sequence forms a ring structure rather than a straight chain, such as the antibiotics tyrocidin and gramicidin. Using peptide maps as identity and purity tests for lot release testing of recombinant therapeutic proteins: FDA and biopharmaceutical industry stakeholders reach consensus on critical issues related to the use of peptide maps as identity tests for proteins and on their usefulness for lot release tests. Hsp60 peptide therapy of NOD mouse diabetes induces a TH2 cytokine burst and downregulates autoimmunity to various beta-cell antigens. www.encyclopedia.com /html/p1/peptide.asp   (721 words)

Peptide Synthesis Peptides are synthesized utilizing the FMOC chemistry and is performed using an automated Applied Biosystems 432A peptide synthesizer, also known as the Synergy. The purity of the peptide is further monitored by mass spectrometry and in some case by amino acid analysis and sequencing. The peptide is washed 3 times with MTBE in order to remove the protection groups and to neutralize any leftover acidity. www.biochem.mcw.edu /protein_facility/peptide_synthesis.html   (449 words)

Bachem peptide neuropeptide neuropeptides biochemicals peptides Peptide and Biochemicals Peptide, Neuropeptide or Peptide, neuro peptide Peptide or Biochemicals of neuropeptide and biochemicals peptide Peptide and Biochemicals Peptide, Neuropeptide or Peptide biochemicals peptide www.bachem.com   (339 words)

peptide Solid-phase peptide synthesis consists of three distinct sets of operations: 1) chain assembly on a resin; 2) simultaneous or sequential cleavage and deprotection of the resin-bound, fully protected chain; and 3) purification and characterisation of the target peptide. Peptides usualy purified by reversed-phase HPLC (high performance liquid chromatography) using columns such as C-18, C-8, and C-4. The number of amino-acid molecules present in a peptide is indicated by a prefix: a dipeptide contains two amino acids; an octapeptide, eight; an oligopeptide, a few; a polypeptide, many. www.biopeptide.com /peptide.htm   (425 words)

Peptide Solutions Peptide Solutions focus is to re-engineer target peptides using its novel n-methyl amino acid portfolio together with other technologies which reduce the degradation and extend the life of peptides in the human body. Peptide Solutions has developed a proprietary N-methylation technology platform (N-Scan) that enables it to manipulate and modify potential and existing peptide therapeutics towards increasing their effectiveness and duration of activity through increasing their stability. The total market for peptides therapeutics in 2004 was approximately US$15 billion, and is growing in excess of 15% pa. Although peptides are excellent drug leads and candidates, the instability of these molecules in the human body limits their therapeutic value and pharmaceutical use, thus providing the opportunity for Peptide Solutions Pty Ltd. www.peptidesolutions.com   (236 words)

Peptide Information Therefore, although the purity of a particular peptide may be quoted as that of 98%, the net peptide content may only be 70%. To compensate for this our peptides are weighed so that the amount of peptide received is exactly that stated on the vial. Solubilisation of extremely insoluble peptides can be assisted with 10% DMSO or DMF, although the use of these may interfere with some biological assays. www.tocris.com /tspeptides.htm   (198 words)

Peptide Sequencing and Synthesis When peptides and proteins larger than 20 to 40 amino acid units are to be sequenced, they are first broken into smaller fragments either by chemical or enzymatic partial hydrolysis. When we are thinking of a peptide's sequence it is convenient to think of it as a chain which is stretched out, peptides are more commonly coiled (alpha helix, Brown p 518) or folded (beta sheet, Brown p 519). In peptides it is commonly the N-H bonds of an amine and the oxygens of the carbonyl groups which participate in hydrogen bonds. chemistry2.csudh.edu /rpendarvis/AmAcSeqSyn.html   (1592 words)

Peptide Hormones Glucose-dependent insulinotropic peptide (GIP) is derived from a 153-amino acid proprotein encoded by the GIP gene and circulates as a biologically active 42-amino acid peptide. Its signal peptide is removed in the cisternae of the endoplasmic reticulum and it is packaged into secretory vesicles in the Golgi, folded to its native structure, and locked in this conformation by the formation of 2 disulfide bonds. Additional peptides are derived from the preproprotein including glicentin which is composed of amino acids 1-69, oxyntomodulin is composed of amino acids 30-69 and the major proglucagon fragment (MPGF) comprises amino acids 72-158. web.indstate.edu /thcme/mwking/peptide-hormones.html   (6153 words)

PNA Peptide Nucleic Acid Peptide nucleic acids (PNA) are DNA mimics with a pseudopeptide backbone. In theory a neutral (peptide) backbone should improve the triplex binding capability of the ligand, and we believed that the pseudo peptide backbone was a good chemical scaffold that would allow us to design recognition moieties that went beyond homopurine targets. PNA or peptide nucleic acid is a DNA mimic with a pseudopeptide backbone. www.horizonpress.com /gateway/pna.html   (673 words)

Peptide Synthesis After the peptide is cleaved from teh resin, the resin is washed away and the peptide is extracted with ether to remove unwanted materials such as the scavengers usedin the cleavage reaction. With peptide synthesis, it is a good idea to contact us before the synthesis is performed to discuss your peptide and the probablility of success in the synthesis. After generation of the resin bound synthetic peptie, the stable blocknig groups are removed and the peptide is cleaved from the resin to produce a "free" peptide. www.biotech.iastate.edu /facilities/protein/synthesis.html   (594 words)

Peptide Synthesis - Peptide Protein Research Ltd (PPR Ltd) Peptides are available in milligram to gram quantities, and a range of purities from crude peptides to >98%. We are experienced in the synthesis of difficult and hydrophobic peptide sequences, and unusual peptide modifications. We specialise in the custom synthesis of synthetic peptides and peptide based molecules, providing a confidential and efficient service at competitive prices. www.peptidesynthetics.co.uk   (119 words)

Copper Peptide Serums - Anti-Aging Skin Care Copper peptides, in combination with the use of exfoliating hydroxy acids, appear to be an excellent method for the reduction of scars and other skin lesions (keratoses, skin tags, some types of moles). The only copper peptides that have been proven - by credible skin authorities who published their results in major dermatology journals - to improve skin and hair are those invented and patented by Dr. Pickart when he was at ProCyte Corporation and the newer breakdown-resistant, long-acting copper peptides that Pickart has since developed and patented. Many single peptides (without copper) being advertised for skin renewal appear to be similar in action to scar producing peptides that were extensively studied for potential uses as wound healing drugs. www.platinumskincare.com /blue-copper-peptide-cp-serum.htm   (2933 words)

peptide hormones Since peptide hormones show species variation in their amino-acid sequence, their names are essentially "generic names", and are insufficient to specify a single chemical compound. The trivial names proposed for peptide hormones are given in the "Appendix." Abbreviations of the new names are not proposed, and the use of currently fashionable abbreviations is discouraged. Thus, "thyroliberin" indicates the hypothalamic peptide stimulating the release (and perhaps also the biosynthesis) of thyrotropin, the corresponding tropic hormone, from the pituitary gland. www.chem.qmul.ac.uk /iubmb/misc/phorm.html   (1062 words)

Proteins This rigidity of the peptide bond reduces the degrees of freedom of the polypeptide during folding. As a consequence of this resonance all peptide bonds in protein structures are found to be almost planar, i.e. at the peptide is very close to 180° (producing a trans, planar peptide with the neighbouring alpha-carbons and the N, H, C, and O between them all lying in one plane). www.friedli.com /herbs/phytochem/proteins.html   (11287 words)

Copper Peptide: Perri Skin Care Such peptides are also used to make synthetic milk given to newborn infants when the babies have disease conditions that make them reject their mother's milk or milk from other animals such as cows and goats. These breakdown-resistant, improved copper peptides give a longer-acting and stronger skin regeneration and also can be used with hydroxy acids and Retin-A. The single peptides (tripeptides or pentapeptides) used in many products are fragile, short-acting, and cannot be used with hydroxy acids. Some are made with yeast and bacteria peptides that may cause allergic reactions. www.homepeels.com /copper-peptide.html   (4507 words)

29th European Peptide Symposium, Gdansk, Poland, September 3-8, 2006 On behalf of the Polish Peptide Community and the Organizing Committee, we have the pleasure of inviting you to participate in the 29th European Peptide Symposium. In the tradition of European Peptide Symposia, the 29th EPS will cover all aspects of the latest developments in peptide research, providing researchers with different backgrounds an opportunity to present and exchange ideas. The thousand-year-old city of Gdansk is situated on the Bay of Gdansk and the southern coast of the Baltic Sea. www.29eps.com   (243 words)

amino acid - multiple sclerosis encyclopaedia From the RNA, amino acids are produced and are joined with one another with a peptide bond. The resulting sequence of amino acids is known as peptide string or polypeptide. During transcription, a gene is echoed from the DNA into a complementary form called ribonucleic acid (RNA). www.mult-sclerosis.org /aminoacid.html   (297 words)

CSBio Peptide Synthesizers and Custom Peptide Synthesis Whether you need to synthesize peptides for research (0.2 to 5.0 grams resin), for industry (0.5 to 500 grams resin) or on a manufacturing scale (50 grams to 50 kilograms resin), C S Bio has a peptide synthesizer that will meet your needs. This instrument is designed to perform an entire synthesis of any peptide of any length without being restricted by a limited number of amino acid additions. C S Bio, People Who Know Peptides, has developed a complete line of fully automated peptide synthesizers. www.csbio.com   (266 words)

Peptide Synthesis Selective incorporation of depsi peptide units into a peptide may prevent undesired peptide association and lead to a strong increase in solubility which is helpful for purification and analysis as well. Our group is interested in getting insight into the molecular basis of interaction between peptide ligands and their membrane-embedded receptors, in particular G protein-coupled receptors class B. These receptors are functional only when embedded in membrane, wherefore it is difficult to obtain direct structural information by spectroscopic methods such as X-ray crystallography or NMR methods. Moreover, since peptides are valuable tools for biomedical studies, our group collaborates with several research groups inside and outside the institute. www.fmp-berlin.de /pepchem/peptide_synthesis/peptide_synthesis.html   (899 words)

C-Peptide A C-peptide test measures the level of this peptide (an inactive amino acid) that is released in the body in amounts equal to insulin. A C-peptide test measures the level of this peptide (formed by amino acids) that is released in the body in amounts equal to insulin. The level of C-peptide in the blood can indicate how much insulin is being produced by the pancreas. www.webmd.com /hw/diabetes_1_2/tu2817.asp   (1267 words)

Peptide Explorer is your source for Cathepsin, Immunomodulators, Caspase Inhibitors, and the Amino Acid Reference Chart. Peptide Explorer is your source for Cathepsin, Immunomodulators, Caspase Inhibitors, and the Amino Acid Reference Chart. The Peptide Explorer offers a variety of product lines to chose from including cathepsin and granzyme inhibitors and substrates, immunomodulators, caspase inhibitors and substrates, neuropeptide y and peptide yy, and natriuretic peptides. Peptide Explorer offers the peptides you need, the information you want, in one location. sigmaaldrich.com /Area_of_Interest/Biochemicals/Peptide_Explorer.html   (156 words)

Global Peptide Services, LLC: Home We couldn't be happier with the hundreds of peptides they have made for us in the past 4 years. “Global Peptide Services has played a major role in support of our peptide drug targeting program at Tapestry Pharmaceuticals, Inc. We have relied on their expertise in both solid-phase synthesis and analytical support in the preclinical phase of new chemical entity (NCE) development. “I have very impressed with the quality of the peptide that I ordered from Global Peptide Services, and I firmly believe that the high quality and purity have resulted in high quality data. www.globalpeptide.com   (199 words)

The Peptide Laboratory Home Page As the need for improved peptides, peptide analogues, and peptidomimetics continues to grow, be assured of our commitment to meet these needs. Our technological improvements in the production of synthetic peptides and their use as analogues of biologically important proteins has thrust us to the forefront of synthetic peptide technology. resins; synthetic peptide analogues of the dopamine, muscarinic, and opioid receptors; peptide analogues of nNOS, iNOS, and eNOS, as well as numerous stock biologically active peptides. www.peptidelab.com   (400 words)

The European Peptide Society Although the early symposia (from 1958 onwards) were necessarily devoted largely to the development of chemical methods for the synthesis of peptides, the programmes now extend to the biology of peptides, and include, for example, structure-activity relationships, conformational studies, peptide vaccines, and the immunology of peptides. The European Peptide Society was founded in 1989 primarily in order to ensure that the valuable but informal European Peptide Symposia should be continued on a sound basis. It does not contribute to the costs of the Journal of Peptide Science: although this is the Society's official journal, it is published by John Wiley and Sons as a financially independant operation. www.swan.ac.uk /chemistry/z__oldweb1998-99/staff/academic/jsd/eps   (494 words)

Peptide Resource Page: custom peptide synthesis, software, and synthesizers Founded in 2004, the PRP is designed to help researchers and educators navigate through the web of peptide related websites. The Peptide Resource Page is your complete guide to peptide research and suppliers. We also maintain an updated list of providers of peptide synthesizers and custom peptides. www.peptideresource.com   (108 words)

Peptide Receptor Ligand Discovery The structure based approach used by 14TM and Proteom enables hits to be identified without prior knowledge of ligands and to explore sites where small molecules, not peptides, bind. The fact that that many of these receptors bind large peptides makes ligand based discovery difficult. Lead compounds are curently being tested against each of these receptors for confirmation of biological activty. www.14tm.com /peptide.htm   (107 words)

BioSyn: DNA Synthesis, Peptide, Organic Synthesis, Life Science Products, Custom Synthesis is a leading life science products company with over 20 years of experience in the design and synthesis of peptides, small molecules and reagents for small scale research and bulk pharmaceutical trials. We have many years of experience in the synthesis of LONG PEPTIDES (up to, but not limited to 100 residues), entirely by chemical synthesis. BioSyn: DNA Synthesis, Peptide, Organic Synthesis, Life Science Products, Custom Synthesis www.biosyn.com   (240 words)

The Peptide Bond The amino acids are linked linearly through peptide bonds. These bonds are formed via a dehydration synthesis reaction between the carboxy group of the first amino acid with the amino group of the second amino acid. web.mit.edu /esgbio/www/lm/proteins/peptidebond.html   (36 words)

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