{"id":1929,"date":"2020-08-19T13:30:17","date_gmt":"2020-08-19T13:30:17","guid":{"rendered":"https:\/\/meddists.com\/learn\/pre-clinical\/biochemistry\/biochemistry-of-the-metabolism\/amino-acid-metabolism\/the-urea-cycle\/"},"modified":"2021-12-08T21:15:50","modified_gmt":"2021-12-08T19:15:50","slug":"the-urea-cycle","status":"publish","type":"page","link":"https:\/\/meddists.com\/learn\/pre-clinical\/biochemistry\/biochemistry-of-the-metabolism\/amino-acid-metabolism\/the-urea-cycle\/","title":{"rendered":"The Urea Cycle"},"content":{"rendered":"\n

The role of the urea cycle is the preparation of urea for the excretion of the excess nitrogen of the body. The steps of the cycle are localized in the mitochondria and cytosol (Figure 1<\/strong>). <\/div><\/p>\n\n\n\n
\n
\n

Urea cycle<\/h2>\n<\/span>\n\n\n
  1. The first step of the cycle is mitochondrial and is catalyzed by ornithine transcarbamoylase (OTC).<\/li>
  2. Ornithine transported the mitochondria and merged together with CP, generating citrulline.<\/li>
  3. Argininosuccinate synthetase (ASS) condenses citrulline with the amino group of Asp.<\/li>
  4. Argininosuccinate is cleaved by argininosuccinate lyase (ASL) to yield arginine and fumarate.<\/li><\/ol>\n\n\n\n

    Arginine is converted to ornithine by the arginase, while urea is released. <\/em><\/p>\n<\/div>\n\n\n\n

    \n
    \"\"<\/a>
    Figure 1. Urea cycle<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n<\/span>\n

    Regulation <\/h2>\n<\/span>\n\n\n

    The synthesis of urea is regulated by two factors, the amounts of urea cycle enzymes<\/strong> and the concentrations of N-acetyl-glutamate<\/strong> and ornithine. Arginine is derived from dietary protein is the main source of ornithine and also the cause of changes in acetylglutamate.<\/p>\n\n\n\n

    While the N-acetyl-GLU act as a short term regulation, the long term regulation involves the gene expression upregulation of the cycle’s enzymes.<\/p>\n\n\n<\/span>\n

    References<\/h2>\n<\/span>\n\n\n

    Snider MDS. Devlin\u2019s Textbook of Biochemistry with Clinical Correlations<\/strong>, the 8th Edition. John Wiley & Sons, Incorporated, 2020; 2019.<\/span> <\/p>\n<\/span>

    Urea cycle<\/h2>

    Regulation <\/h2>

    References<\/h2><\/div>","protected":false},"excerpt":{"rendered":"

    Urea cycle The first step of the cycle is mitochondrial and is catalyzed by ornithine transcarbamoylase (OTC). Ornithine transported the mitochondria and merged together with CP, generating citrulline. Argininosuccinate synthetase (ASS) condenses citrulline with the amino group of Asp. Argininosuccinate is cleaved by argininosuccinate lyase (ASL) to yield arginine and fumarate. Arginine is converted to […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1714,"menu_order":15,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1929","page","type-page","status-publish","hentry"],"yoast_head":"\nThe Urea Cycle – Meddists<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/meddists.com\/learn\/pre-clinical\/biochemistry\/biochemistry-of-the-metabolism\/amino-acid-metabolism\/the-urea-cycle\/\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" 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