peptide

Ribosome

...ein synthesis, and that one aspect of the process, peptide transfer, can occur in the presence of rRNA alone, albeit at a slower rate. This suggests that the protein components of ribosomes act as a scaffold that may enhance the ability of rRNA to synthesise protein. The structure and function of ribosomes,...

RNA

...es use RNA as their sole genetic material, while peptide bond formation in the ribosome is carried out by an RNA-derived ribozyme . From this perspective, retroviruses and ribozymes are remnants, or molecular fossils, left over from that RNA world. Assuming that DNA is better suited for storage of gene...

Proteomics

...hniques are based on mass spectrometry , commonly peptide mass fingerprinting on simpler instruments, or d...ted to searching databases for possible protein or peptide matches, but also functional assignment of domains, prediction of function from sequence, and evolut...

Proteome

...es the protein's identity by matching the observed peptide masses against a sequence database . Tandem mass spectrometry, on the other hand, can get sequence information from individual peptides by isolating them, colliding them with a nonreactive gas, and then cataloging the fragment ions produced. P...

Protein

...ompound that consists of amino acids joined by peptide bonds . Proteins are essential to the structure an... primary structure is held together by covalent peptide bonds , which are made during the process of translation . The secondary structures are held toget...

Primary structure

... of the molecule to obtain either nucleotide or peptide sequence . The primary structure, in other words, is a biopolymer's exact chemical composition and to the sequence in which its subunits are arranged. While the primary structure of a biological polymer to a large extent determines the three-dimensi...

Peptide

...amide bond , and is sometimes referred to as a peptide bond . An amide bond is somewhat shorter than a ty...ids, by virtue of their size. Traditionally, those peptide chains that are short enough to make synthetically from the constituent amino acids are called pept...

Peptide

...amide bond , and is sometimes referred to as a peptide bond . An amide bond is somewhat shorter than a ty...ids, by virtue of their size. Traditionally, those peptide chains that are short enough to make synthetically from the constituent amino acids are called pept...

Peptide bond

A peptide bond is a chemical bond formed between two mol...sis reaction The resulting C-N bond is called a peptide bond, and the resulting molecule is called an amide . Polypeptides and proteins are chains of a...

Origin of life

...ss-reactions with the amino acids or terminate the peptide chain. A possible answer to this polymerization conundrum was provided in 1980s by Gnter Wchtershuser , in his iron-sulfur world theory . In this theory, he postulated the evolution of (bio)chemical pathways as fundamentals of the evolution of l...

Neurotransmitter

...s ): Bombesin/GRP: bombesin gastrin releasing peptide (GRP) Gastrins: gastrin cholecystokinin ...europeptide Y (NY) pancreatic polypeptide (PP) peptide YY (PYY) Opioids : corticotropin (ACTH) Beta-lipotropin dynorphin endorphin enkepha...

Nephron

...erone , parathyroid hormone , atrial-natriuretic peptide and others. In this process urine is produced, and in doing so, eliminates wastes from the body, regulates blood volume and blood pressure , regulates the levels of important electrolytes and metabolites and regulates blood pH levels. Co...

Major histocompatibility complex

...en MHC class I and II in the method and outcome of peptide presentation. Mhc Class I molecules are found on almost every nucleated cell of the body. Class I molecules are heterodimers , consisting of a single transmembrane polypeptide chain (the α-chain) and a β 2 microglobulin (which is ...

Insulin

...y contain no C-peptide component, serum amounts of peptide C are good indicators of internal insulin production. C-peptide has recently been discovered to have biological activity itself; the activity is apparently confined to an effect on the muscular layer of the arteries . Actions on cellular and meta...

Hydrolysis

...ent alcohol and carboxylic acid . Hydrolysing peptide link of amino acids In other hydrolysis reactions such as hydrolysing the peptide links of amino acids only one of the products, the carboxylic acid product, has a hydroxide group...

Hormone

...onsist of chains of amino acids. Examples of small peptide hormones are TRH and vasopressin . Peptides com...n, arginine vasopressin, AVP) atrial-natriuretic peptide (ANP, also atriopeptin) calcitonin cholecystokinin (CCK) corticotropin-releasing hormone (...

Enzyme

... of the ribosome, which catalyzes the formation of peptide bonds in growing protein chains. Enzymes and he... Protease (peptidase): those enzymes which cut peptide bonds of proteins Protein kinases : those enzymes that transfer a phosphate group to an amino ...

Digestion

... in resonse to fat in chyme. Gastric inhibitory peptide (GIP) - is in the duodenum and decreases the stomach churning in turn slowing the emptying in the stomach. Digestion in plants and fungi Not only animals digest food. Some carnivorous plants capture other organisms, usually invertebrate an...

Apoptosis

...be dramatically restored in H460 cells with a Smac peptide (SmacN7) that targets IAPs. Yang and her team successfully developed a SmacN7 peptide that selectively reversed apoptosis resistance - and hence tumor growth - in H460 cells in mice. (S...

Amino acid

... from the carboxylic side) in the formation of a peptide bond . Contents showTocToggle("show","hide"...are created by polymerization of amino acids by peptide bonds in a process called translation . Peptide bond formation 1. Amino acid; 2, zwitte...

Alpha helix

...and peptides and Pauling's prediction of planar peptide bonds . The amino acids in an α helix are a...nts in proteins, together with beta sheets . The peptide backbone of an α helix has 3.6 amino acids per turn. See also : tertiary structure -- &b...