6pof

Structure of human ATP citrate lyaseStructure of human ATP citrate lyase

6pof, resolution 4.30Å Show:Asymmetric Unit Biological Assembly Structural highlights 6pof is a 4 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: ACLY (HUMAN) Activity: ATP citrate synthase, with EC number 2.3.3.8 Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [ACLY_HUMAN] ATP citrate-lyase is the primary enzyme responsible for the synthesis of cytosolic acetyl-CoA in many tissues. Has a central role in de novo lipid synthesis. In nervous tissue it may be involved in the biosynthesis of acetylcholine. Publication Abstract from PubMed ATP-citrate lyase (ACLY) synthesizes cytosolic acetyl coenzyme A (acetyl-CoA), a fundamental cellular building block. Accordingly, aberrant ACLY activity is observed in many diseases. Here we report cryo-EM structures of human ACLY, alone or bound to substrates or products. ACLY forms a homotetramer with a rigid citrate synthase homology (CSH) module, flanked by four flexible acetyl-CoA synthetase homology (ASH) domains; CoA is bound at the CSH-ASH interface in mutually exclusive productive or unproductive conformations. The structure of a catalytic mutant of ACLY in the presence of ATP, citrate and CoA substrates reveals a phospho-citryl-CoA intermediate in the ASH domain. ACLY with acetyl-CoA and oxaloacetate products shows the products bound in the ASH domain, with an additional oxaloacetate in the CSH domain, which could function in ACLY autoinhibition. These structures, which are supported by biochemical and biophysical data, challenge previous proposals of the ACLY catalytic mechanism and suggest additional therapeutic possibilities for ACLY-associated metabolic disorders. Molecular basis for acetyl-CoA production by ATP-citrate lyase.,Wei X, Schultz K, Bazilevsky GA, Vogt A, Marmorstein R Nat Struct Mol Biol. 2019 Dec 23. pii: 10.1038/s41594-019-0351-6. doi:, 10.1038/s41594-019-0351-6. PMID:31873304 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.