8sk8

From Proteopedia

human liver mitochondrial Glutamate dehydrogenase 1

Structural highlights

8sk8 is a 6 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 2.31Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

DHE3_HUMAN Defects in GLUD1 are the cause of familial hyperinsulinemic hypoglycemia type 6 (HHF6) [MIM:606762; also known as hyperinsulinism-hyperammonemia syndrome (HHS). Familial hyperinsulinemic hypoglycemia [MIM:256450, also referred to as congenital hyperinsulinism, nesidioblastosis, or persistent hyperinsulinemic hypoglycemia of infancy (PPHI), is the most common cause of persistent hypoglycemia in infancy and is due to defective negative feedback regulation of insulin secretion by low glucose levels. In HHF6 elevated oxidation rate of glutamate to alpha-ketoglutarate stimulates insulin secretion in the pancreatic beta cells, while they impair detoxification of ammonium in the liver.^[1] ^[2] ^[3] ^[4]

Function

DHE3_HUMAN May be involved in learning and memory reactions by increasing the turnover of the excitatory neurotransmitter glutamate (By similarity).

Publication Abstract from PubMed

The application of integrated systems biology to the field of structural biology is a promising new direction, although it is still in the infant stages of development. Here we report the use of single particle cryo-EM to identify multiple proteins from three enriched heterogeneous fractions prepared from human liver mitochondrial lysate. We simultaneously identify and solve high-resolution structures of nine essential mitochondrial enzymes with key metabolic functions, including fatty acid catabolism, reactive oxidative species clearance, and amino acid metabolism. Our methodology also identified multiple distinct members of the acyl-CoA dehydrogenase family. This work highlights the potential of cryo-EM to explore tissue proteomics at the atomic level.

High-Resolution Structural Proteomics of Mitochondria Using the 'Build and Retrieve' Methodology.,Zhang Z, Tringides ML, Morgan CE, Miyagi M, Mears JA, Hoppel CL, Yu EW Mol Cell Proteomics. 2023 Dec;22(12):100666. doi: 10.1016/j.mcpro.2023.100666. , Epub 2023 Oct 14. PMID:37839702^[5]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Stanley CA, Lieu YK, Hsu BY, Burlina AB, Greenberg CR, Hopwood NJ, Perlman K, Rich BH, Zammarchi E, Poncz M. Hyperinsulinism and hyperammonemia in infants with regulatory mutations of the glutamate dehydrogenase gene. N Engl J Med. 1998 May 7;338(19):1352-7. PMID:9571255
↑ Miki Y, Taki T, Ohura T, Kato H, Yanagisawa M, Hayashi Y. Novel missense mutations in the glutamate dehydrogenase gene in the congenital hyperinsulinism-hyperammonemia syndrome. J Pediatr. 2000 Jan;136(1):69-72. PMID:10636977
↑ Santer R, Kinner M, Passarge M, Superti-Furga A, Mayatepek E, Meissner T, Schneppenheim R, Schaub J. Novel missense mutations outside the allosteric domain of glutamate dehydrogenase are prevalent in European patients with the congenital hyperinsulinism-hyperammonemia syndrome. Hum Genet. 2001 Jan;108(1):66-71. PMID:11214910
↑ MacMullen C, Fang J, Hsu BY, Kelly A, de Lonlay-Debeney P, Saudubray JM, Ganguly A, Smith TJ, Stanley CA. Hyperinsulinism/hyperammonemia syndrome in children with regulatory mutations in the inhibitory guanosine triphosphate-binding domain of glutamate dehydrogenase. J Clin Endocrinol Metab. 2001 Apr;86(4):1782-7. PMID:11297618
↑ Zhang Z, Tringides ML, Morgan CE, Miyagi M, Mears JA, Hoppel CL, Yu EW. High-Resolution Structural Proteomics of Mitochondria Using the 'Build and Retrieve' Methodology. Mol Cell Proteomics. 2023 Dec;22(12):100666. PMID:37839702 doi:10.1016/j.mcpro.2023.100666