9gne

CryoEM structure of mammalian AAP in complex with acetyl-alanyl-chloromethylketone

spinqualitylabelsall models 9gne, resolution 3.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9gne is a 4 chain structure with sequence from Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.2Å Ligands: A1INA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ACPH_PIG This enzyme catalyzes the hydrolysis of the N-terminal peptide bond of an N-acetylated peptide to generate an N-acetylated amino acid and a peptide with a free N-terminus (By similarity). It preferentially cleaves off Ac-Ala, Ac-Met and Ac-Ser (By similarity). Also, involved in the degradation of oxidized and glycated proteins (By similarity).[UniProtKB:P13676][UniProtKB:P13798] Publication Abstract from PubMed Acylpeptide hydrolase (APEH) or acylaminoacyl-peptidase (AAP) is a serine hydrolase that regulates protein metabolism. It can also bind to and process unusual substrates, acting as a detoxifier. To better understand its promiscuous specificity, we determined the cryo-EM structures of mammalian APEH complexed with classical serine protease partners: a chloromethyl-ketone (CMK) inhibitor, an organophosphate (OP) pesticide (dichlorvos), and benzenesulfonyl-fluoride. Since CMK derivatives of N-acetylated peptides were suggested to induce apoptosis by inhibiting APEH, while OP complexes may serve as biomarkers of OP exposure and are linked to cognitive enhancement, these complexes carry physiological significance. We identified a unique strand-breaker Pro residue in the hydrolase domain, which relaxes the active site into a partially inactivated but more spacious conformation, transforming the classical serine protease apparatus into a versatile yet potent hydrolysis center with broad specificity, distinguishing the mammalian enzyme not only from other APEHs but also from serine alpha/beta hydrolases sharing essentially the same fold. Ligand binding Pro-miscuity of acylpeptide hydrolase, structural analysis of a detoxifying serine hydrolase.,Kiss-Szeman AJ, Takacs L, Jakli I, Banoczi Z, Hosogi N, Traore DAK, Harmat V, Perczel A, Menyhard DK Protein Sci. 2025 Nov;34(11):e70320. doi: 10.1002/pro.70320. PMID:41074793 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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