TY - CHAP M1 - Book, Section TI - Catabolism of Proteins & of Amino Acid Nitrogen A1 - Rodwell, Victor W. A2 - Rodwell, Victor W. A2 - Bender, David A. A2 - Botham, Kathleen M. A2 - Kennelly, Peter J. A2 - Weil, P. Anthony PY - 2018 T2 - Harper's Illustrated Biochemistry, 31e AB - OBJECTIVESAfter studying this chapter, you should be able to:Describe protein turnover, indicate the mean rate of protein turnover in healthy individuals, and provide examples of human proteins that are degraded at rates greater than the mean rate.Outline the events in protein turnover by both ATP-dependent and ATP-independent pathways, and indicate the roles in protein degradation played by the proteasome, ubiquitin, cell surface receptors, circulating asialoglycoproteins, and lysosomes.Indicate how the ultimate end products of nitrogen catabolism in mammals differ from those in birds and fish.Illustrate the central roles of transaminases (aminotransferases), of glutamate dehydrogenase, and of glutaminase in human nitrogen metabolism.Use structural formulas to represent the reactions that convert NH3, CO2, and the amide nitrogen of aspartate into urea, and identify the subcellular locations of the enzymes that catalyze urea biosynthesis.Indicate the roles of allosteric regulation and of acetylglutamate in the regulation of the earliest steps in urea biosynthesis.Explain why metabolic defects in different enzymes of urea biosynthesis, although distinct at the molecular level, present similar clinical signs and symptoms.Describe both the classical approaches and the role of tandem mass spectrometry in screening neonates for inherited metabolic diseases. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/18 UR - accesspharmacy.mhmedical.com/content.aspx?aid=1160190122 ER -