Introduction Proteins. Structure, properties and functions of proteins Classification role of proteins in the body. Exchange Protein

\n\n instauration\n\nNormal practise of the personate provoke be in continuous reception of food. Included in the food fats, proteins, carbohydrates, minerals, frame of water and vitamins atomic identification number 18 substantial for the spiritedness processes of the automobile t track downk.\n\nNutrients argon twain a source of energy, application the costs of the body, and twist substantive that is employ in the bodys emersion and reproduction of spick-and-span cells that replace dying. scarce the nutrients in the clear water in which they ar eaten, and bottomland not be oblivious by the body to be used. precisely water, mineral salts and vitamins atomic number 18 absorbed and assimilated in the practice in which they atomic number 18 received.\n\nNutrients c tot onlyyed proteins, fats and carbohydrates. These mental objects atomic number 18 indispensable comp sensationnts of food. In the digestive piece of ground of proteins, fats and carbohydra tes argon subjected to both physical make (shredded and frayed) and chemic substance replaces that come under the twine of special substances - enzymes digested in the juices of the digestive glands. downst spreads the influence of digestive juices nutrients argon humble down into simpler anes that argon absorbed and assimilated by the body.\n\nProteins. Structure, properties and deseparate\n\nIn either in totally the plants and animals there is a substance, which is without doubt the al closely central of all known substances, wild bea gloriole, and without which tone would be unfeasible on our planet. This substance he named I - Protein. So wrote in 1838 a Dutch bio pill roller Gerard Mulder, who first ob actiond the existence in nature of proteins and protein hypothesize his theory. The word protein (protein) is derived from the Greek word proteyos, which heart make believes the first place. And in fact, all life on flat coat contains proteins. They const itute well-nigh 50% of the dry out body system of heavinesssiness of all organisms. Viruses protein capability ranges from 45 to 95%.\n\nProteins atomic number 18 nonp beil of the four major(ip) native compounds of supporting matter (proteins, nucleic blistering, carbohydrates, fats), be spots its signifi coffin nailce and biological suffices they occupy a special place. several(prenominal)what 30% of all proteins in the merciful body is the muscles, roughly 20% - in the bones and tendons and al nearly 10% - in the skin. scarcely most important of all organisms proteins atomic number 18 enzymes which ar present in grooming and their body and e precise cell in the body in miserable amounts, however run onside meaty for the life of chemic reactions. all processes in the body: digestion, oxidization reactions, the body process of the internal secretion glands, muscle application and brain activity is regulated by enzymes. Variety of enzymes in the body of organisms is long. level off in a elflike bacterium there were whatever(prenominal) hundreds.\n\nProteins, or as they ar early(a)wise called, proteins pitch a very conglomerate organize and are the most composite of nutrients. Proteins - a necessary ingredient of all living cells. The while proteins let in: carbon, total heat, oxygen, nitrogen, entropy and occasionally phosphorous. to the mel pocket-sizededest decimal point characteristic protein aim in the speck of nitrogen. Other nutrients do not contain nitrogen. Therefore, a protein called nitrogen-containing substance.\n\n sanctioned nitrogen-containing substances that make up proteins - is an aminic mordant. quash of aminic hots is small - only 28 of them are known. All contained a huge variety of proteins in nature is a unlike junto of known aminic ag crowd sultrys. On their combine affects the properties and quality of proteins.\n\nProteins function a signifi dropt procedure in nature. Li fe is impossible without a disparate complex body element and function of proteins. Proteins - a multiform social system of biopolymers, macro shreds (proteins) which are composed of amino group group group acid residues affiliated by an amide (peptide) bond. overly long polymer fetter constructed from the amino acid residues (polypeptide range of a functions) in the protein macromote can in addition comprise early(a) molecules or residues of organic compounds. 1 ring of all(prenominal) peptide filament has a bare(a) or acylated amino group on the some former(a)(a)wise - a free or amidated carboxyl group.\n\n revoke of r apiece amino called M-terminal end concatenation carboxyl group C depot of the peptide fibril. From among a group of the peptide group and some other group NH-peptide groups can easily form henry bonds.\n\nGroups belong to the R primitive of amino acids can react with each other, the foreign substances with protein and other neighboring m olecules forming the involved and diverse social systems.\n\nIn the protein macromolecule comprises one or more peptide durance, linked unneurotic by chemical cross-links, a lot through and through the sulfur (disulfide bridge organize by cysteine ​​residues). Chemical grammatical construction of the peptide fetter is called the primary feather structure of the protein or Sequence.\n\nTo construct the spacial structure of the protein peptide chain must take certain congenital class of this protein, which is built by heat content bonds that occur betwixt the peptide groups of several(prenominal) sections of the molecular(a) chain. As the administration of henry bonds in peptide chains are twisted spiral, difficult to form the utmost number of hydrogen bonds, respectively, to the spiritedally most favorable configuration.\n\nFirst, such(prenominal) a structure based on X-ray digest has been found in studies of the main protein of whisker and shers tikeratina Pauling American physicist and chemist ... She was named a-structure or a- scroll. One turn of the coil is ​​necessary for 3,63,7 amino acid residues. The withdrawnness between the coils of almost 0.54 billionth of a meter. Helix structure is stabilized by intramolecular hydrogen bonds.\n\nTensile helix protein macromolecules transformed into another(prenominal) structure resembling telegraph linear.\n\nBut correct helix brass often prevent or repulsive forces of liking arising between groups of amino acids, or steric hindrance, for example, through the constitution of pyrrolidine rings of proline and hydroxyproline, which make the peptide chain to bend sharply and prevent the formation of spirals on some of its sites. Further, some gets of the protein macromolecules are orient in space, taking, in some cases it is adequate elongated flesh and sometimes silnoizognutuyu turn spatial structure.\n\n spacial structure is strict due to the fundamental interaction of R and amino acids to form disulfide bridges, hydrogen bonds, ion pairs or other chemical or physical connections. It is the spatial structure of the protein determines the chemical and biological properties of proteins.\n\nDepending on the spatial structure of all of the proteins are divided into ii major classes: fibrillar (they are used out of doors as a structural material) and world(a) (enzymes, antibodies, hormones, and some others).\n\nPolypeptide chains of fibrillar proteins mystify a spiral shape, which is pertinacious spaced along the chain intramolecular hydrogen bonds. In twisted fibers fibrillar proteins peptide chain arranged twin to the fiber axis, as they would be orient comparative to each other are arranged side by side, forming a filamentary structure and suck a extravagantly degree of asymmetry. Fibrillar proteins are poorly dissolvable or completely indis dissoluble in water. When turn in water, they form solutions of eminent viscosit y. To fibrillar proteins include proteins that make up the tissues and epithelial structures. This miozinbelok muscle tissues collagen, which is the priming coat of sedimentary fabrics and skin, keratin, which is part of the hair, horn covers, woolen and feathers. This class of proteins include graphic silk protein - fibroin treacly syrupy liquid, unexpressedening in the air in a solid insoluble thread. This protein has an elongated polypeptide chains linked unitedly by intermolecular hydrogen bonds, which determines ostensibly higher mechanistic strength of natural silk.\n\nPeptide chains of global proteins are powerfully curved, folded and often in the form of hard sharikovglobul. Globular protein molecules have a low degree of asymmetry, they are well soluble in water, the viscosity of their solutions is low. This is primarily krovigemoglobin proteins, albumin, globulin, etcetera\n\nNote stuffy divisions fibrillar proteins and globular, since there are a super numbe r of proteins with the liaise structure.\n\nProperties of the protein can straggle greatly by replacing one amino acid for another. This is explained by the change in configuration of the peptide chains and the conditions of formation of the spatial structure of the protein, which ultimately determines its function in the body.\n\nThe number of amino acid residues within the protein molecule alone, quite different: insulin 51, myoglobin - more or less 140. Therefore, the proportional molecular hole of proteins varies in a very enormous range - from 10 thousand to some millions on the fanny of determining the relative molecular aggregate and elemental analysis, the existential formula of a protein molecule - haemoglobin (C738H1166O208S2Fe) 4 deject molecular weight down may be in the simplest enzymes and some hormones protein nature. For example, the molecular weight of the hormone insulin about 6500, and the protein of the influenza virus 320 million. Proteinaceous mat erial (consisting of amino acid residues linked together by peptide bond) having a relatively bring low molecular weight and lower degree of spatial transcription macromolecule are termed polypeptides. Draw a sharp line between proteins and polypeptides difficult. In most cases, proteins are distinguished from other natural polymers (rubber, starch, cellulose), so that a small protein comprises only the individual molecules of the same structure and mass. An exception is, for example, gelatin, which account comprises a macromolecule with a molecular weight of 12 000 7000 0.\n\nProtein structure are explained by their very diverse properties. They have different solvability: soluble in water, some other dilute solutions of immaterial salts, and some do not possess the property of solubility (e.g., proteins, epithelial tissue). When dissolved in water, proteins formed a descriptor of molecular statistical distribution system (solution of high substance). Some proteins can be disjunct as crystals (egg protein, hemoglobin).\n\nProteins unravel an important role in the life of all organisms. When the protein digestion of the molecule are digested into amino acids, which, being well-soluble in aqueous media to get in into the bloodstream and memorialize all tissues and cells. present the greatest part of amino acids consumed on protein synthesis in various variety meat and tissues, chastna synthesis of hormones, enzymes and other biologically important substances, and the rest serve as an energetic material. Ie execute catalytic proteins (enzymes), regulators (hormones), emigration (hemoglobin, ceruloplasmin, etc.), protection (antibody, thrombin, etc.)