베타-메틸크로토닐-CoA

베타-메틸크로토닐-CoA
식별자
CAS 번호	6247-62-7 ;
MeSH	Methylcrotonyl-CoA
PubChem CID	1138;
CompTox Dashboard (EPA)	DTXSID801343051 ;
성질
화학식	C26H42N7O17P3S
몰 질량	849.636 g/mol
	달리 명시된 경우를 제외하면, 표준상태(25 °C [77 °F], 100 kPa)에서 물질의 정보가 제공됨. 확인 (관련 정보 ?) 정보상자 각주

β-메틸크로토닐-CoA(영어: β-methylcrotonyl-CoA, MC-CoA) 또는 3-메틸크로토닐-CoA(영어: 3-methylcrotonyl-CoA)는 류신의 대사 경로에서의 대사 중간생성물이다. β-메틸크로토닐-CoA는 아이소발레릴-CoA 탈수소효소에 의해 아이소발레릴-CoA로부터 생성된다.

류신의 대사 경로

사람에서 L-류신과 관련한 β-하이드록시 β-메틸뷰티르산(HMB) 및 아이소발레릴-CoA에 대한 대사 경로. 두 가지 주요 경로 중 L-류신은 대부분 아이소발레릴-CoA로 대사되는 반면, β-하이드록시 β-메틸뷰티르산(HMB)으로 대사되는 경우는 약 5%에 불과하다.^[1]^[2]^[3]

같이 보기

각주

↑ Wilson JM, Fitschen PJ, Campbell B, Wilson GJ, Zanchi N, Taylor L, Wilborn C, Kalman DS, Stout JR, Hoffman JR, Ziegenfuss TN, Lopez HL, Kreider RB, Smith-Ryan AE, Antonio J (February 2013). “International Society of Sports Nutrition Position Stand: beta-hydroxy-beta-methylbutyrate (HMB)”. 《Journal of the International Society of Sports Nutrition》 10 (1): 6. doi:10.1186/1550-2783-10-6. PMC 3568064. PMID 23374455.
↑ Zanchi NE, Gerlinger-Romero F, Guimarães-Ferreira L, de Siqueira Filho MA, Felitti V, Lira FS, Seelaender M, Lancha AH (April 2011). “HMB supplementation: clinical and athletic performance-related effects and mechanisms of action”. 《Amino Acids》 40 (4): 1015–1025. doi:10.1007/s00726-010-0678-0. PMID 20607321. HMB is a metabolite of the amino acid leucine (Van Koverin and Nissen 1992), an essential amino acid. The first step in HMB metabolism is the reversible transamination of leucine to [α-KIC] that occurs mainly extrahepatically (Block and Buse 1990). Following this enzymatic reaction, [α-KIC] may follow one of two pathways. In the first, HMB is produced from [α-KIC] by the cytosolic enzyme KIC dioxygenase (Sabourin and Bieber 1983). The cytosolic dioxygenase has been characterized extensively and differs from the mitochondrial form in that the dioxygenase enzyme is a cytosolic enzyme, whereas the dehydrogenase enzyme is found exclusively in the mitochondrion (Sabourin and Bieber 1981, 1983). Importantly, this route of HMB formation is direct and completely dependent of liver KIC dioxygenase. Following this pathway, HMB in the cytosol is first converted to cytosolic β-hydroxy-β-methylglutaryl-CoA (HMG-CoA), which can then be directed for cholesterol synthesis (Rudney 1957) (Fig. 1). In fact, numerous biochemical studies have shown that HMB is a precursor of cholesterol (Zabin and Bloch 1951; Nissen et al. 2000).
↑ Kohlmeier M (May 2015). 〈Leucine〉. 《Nutrient Metabolism: Structures, Functions, and Genes》 2판. Academic Press. 385–388쪽. ISBN 978-0-12-387784-0. 2016년 6월 6일에 확인함. Energy fuel: Eventually, most Leu is broken down, providing about 6.0kcal/g. About 60% of ingested Leu is oxidized within a few hours ... Ketogenesis: A significant proportion (40% of an ingested dose) is converted into acetyl-CoA and thereby contributes to the synthesis of ketones, steroids, fatty acids, and other compounds
Figure 8.57: Metabolism of L-leucine

[1] Wilson JM, Fitschen PJ, Campbell B, Wilson GJ, Zanchi N, Taylor L, Wilborn C, Kalman DS, Stout JR, Hoffman JR, Ziegenfuss TN, Lopez HL, Kreider RB, Smith-Ryan AE, Antonio J (February 2013). “International Society of Sports Nutrition Position Stand: beta-hydroxy-beta-methylbutyrate (HMB)”. 《Journal of the International Society of Sports Nutrition》 10 (1): 6. doi:10.1186/1550-2783-10-6. PMC 3568064. PMID 23374455.

[2] Zanchi NE, Gerlinger-Romero F, Guimarães-Ferreira L, de Siqueira Filho MA, Felitti V, Lira FS, Seelaender M, Lancha AH (April 2011). “HMB supplementation: clinical and athletic performance-related effects and mechanisms of action”. 《Amino Acids》 40 (4): 1015–1025. doi:10.1007/s00726-010-0678-0. PMID 20607321. HMB is a metabolite of the amino acid leucine (Van Koverin and Nissen 1992), an essential amino acid. The first step in HMB metabolism is the reversible transamination of leucine to [α-KIC] that occurs mainly extrahepatically (Block and Buse 1990). Following this enzymatic reaction, [α-KIC] may follow one of two pathways. In the first, HMB is produced from [α-KIC] by the cytosolic enzyme KIC dioxygenase (Sabourin and Bieber 1983). The cytosolic dioxygenase has been characterized extensively and differs from the mitochondrial form in that the dioxygenase enzyme is a cytosolic enzyme, whereas the dehydrogenase enzyme is found exclusively in the mitochondrion (Sabourin and Bieber 1981, 1983). Importantly, this route of HMB formation is direct and completely dependent of liver KIC dioxygenase. Following this pathway, HMB in the cytosol is first converted to cytosolic β-hydroxy-β-methylglutaryl-CoA (HMG-CoA), which can then be directed for cholesterol synthesis (Rudney 1957) (Fig. 1). In fact, numerous biochemical studies have shown that HMB is a precursor of cholesterol (Zabin and Bloch 1951; Nissen et al. 2000).

[3] Kohlmeier M (May 2015). 〈Leucine〉. 《Nutrient Metabolism: Structures, Functions, and Genes》 2판. Academic Press. 385–388쪽. ISBN 978-0-12-387784-0. 2016년 6월 6일에 확인함. Energy fuel: Eventually, most Leu is broken down, providing about 6.0kcal/g. About 60% of ingested Leu is oxidized within a few hours ... Ketogenesis: A significant proportion (40% of an ingested dose) is converted into acetyl-CoA and thereby contributes to the synthesis of ketones, steroids, fatty acids, and other compounds
Figure 8.57: Metabolism of L-leucine

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