8j7o

From Proteopedia

Human pyruvate carboxylase in BCCP-CTS state without BC

Structural highlights

8j7o is a 4 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 3.83Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

PYC_HUMAN Defects in PC are the cause of pyruvate carboxylase deficiency (PC deficiency) [MIM:266150. PC deficiency leads to lactic acidosis, mental retardation and death. It occurs in three forms: mild or type A, severe neonatal or type B, and a very mild lacticacidemia.

Function

PYC_HUMAN Pyruvate carboxylase catalyzes a 2-step reaction, involving the ATP-dependent carboxylation of the covalently attached biotin in the first step and the transfer of the carboxyl group to pyruvate in the second. Catalyzes in a tissue specific manner, the initial reactions of glucose (liver, kidney) and lipid (adipose tissue, liver, brain) synthesis from pyruvate.

Publication Abstract from PubMed

The enzymes 3-methylcrotonyl-coenzyme A (CoA) carboxylase (MCC), pyruvate carboxylase and propionyl-CoA carboxylase belong to the biotin-dependent carboxylase family located in mitochondria. They participate in various metabolic pathways in human such as amino acid metabolism and tricarboxylic acid cycle. Many human diseases are caused by mutations in those enzymes but their structures have not been fully resolved so far. Here we report an optimized purification strategy to obtain high-resolution structures of intact human endogenous MCC, propionyl-CoA carboxylase and pyruvate carboxylase in different conformational states. We also determine the structures of MCC bound to different substrates. Analysis of MCC structures in different states reveals the mechanism of the substrate-induced, multi-element synergistic activation of MCC. These results provide important insights into the catalytic mechanism of the biotin-dependent carboxylase family and are of great value for the development of new drugs for the treatment of related diseases.

Structural insight into synergistic activation of human 3-methylcrotonyl-CoA carboxylase.,Su J, Tian X, Cheng H, Liu D, Wang Z, Sun S, Wang HW, Sui SF Nat Struct Mol Biol. 2024 Sep 2. doi: 10.1038/s41594-024-01379-3. PMID:39223421^[1]

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

References

↑ Su J, Tian X, Cheng H, Liu D, Wang Z, Sun S, Wang HW, Sui SF. Structural insight into synergistic activation of human 3-methylcrotonyl-CoA carboxylase. Nat Struct Mol Biol. 2024 Sep 2. PMID:39223421 doi:10.1038/s41594-024-01379-3