Analytical\u00a0and\u00a0synthetic\u00a0procedures reveal only the primary structure of the proteins\u2014that is, the amino acid sequence of the peptide chains. They do not reveal information about the\u00a0conformation\u00a0(arrangement in space) of the peptide chain\u2014that is, whether the peptide chain is present as a long straight thread or is irregularly coiled and folded into a globule. The\u00a0configuration, or conformation, of a protein is determined by mutual attraction or repulsion of polar or nonpolar groups in the side chains (R<\/em>\u00a0groups) of the amino acids. The former have positive or negative charges in their side chains; the latter repel\u00a0water\u00a0but attract each other. Some parts of a peptide chain containing 100 to 200 amino acids may form a loop, or helix; others may be straight or form irregular coils.<\/p>\n\n\n\n The terms\u00a0secondary<\/em>,\u00a0tertiary<\/em>, and\u00a0quaternary structure<\/em>\u00a0are frequently applied to the configuration of the peptide chain of a protein. A\u00a0nomenclature\u00a0committee of the International Union of Biochemistry (IUB) has defined these terms as follows: The primary structure of a protein is determined by its amino acid sequence without any regard for the arrangement of the peptide chain in space. The secondary structure is determined by the spatial arrangement of the main peptide chain without any regard for the conformation of side chains or other segments of the main chain. The tertiary structure is determined by both the side chains and other\u00a0adjacent\u00a0segments of the main chain, without regard for neighbouring peptide chains. Finally, the term\u00a0quaternary structure<\/em>\u00a0is used for the arrangement of identical or different subunits of a large protein in which each subunit is a separate peptide chain.<\/p>\n","protected":false},"excerpt":{"rendered":" Primary structure Analytical\u00a0and\u00a0synthetic\u00a0procedures reveal only the primary structure of the proteins\u2014that is, the amino acid sequence of the peptide chains. They do not reveal information about the\u00a0conformation\u00a0(arrangement in space) of the peptide chain\u2014that is, whether the peptide chain is present as a long straight thread or is irregularly coiled and folded into a globule. The\u00a0configuration, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1963","post","type-post","status-publish","format-standard","hentry","category-proteins"],"Cooking_time":"","jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1963","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/comments?post=1963"}],"version-history":[{"count":1,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1963\/revisions"}],"predecessor-version":[{"id":1964,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1963\/revisions\/1964"}],"wp:attachment":[{"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=1963"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=1963"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cake.appscodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=1963"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}