8pbp

Mutant R1785C of the dihydroorotase domain of human CAD protein bound to the substrate carbamoyl aspartate

spinqualitylabelsall models 8pbp, resolution 1.54Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8pbp is a 1 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: X-ray diffraction, Resolution 1.54Å Ligands: DOR, FMT, KCX, NCD, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PYR1_HUMAN This protein is a "fusion" protein encoding four enzymatic activities of the pyrimidine pathway (GATase, CPSase, ATCase and DHOase). Publication Abstract from PubMed CAD is a large, 2225 amino acid multienzymatic protein required for de novo pyrimidine biosynthesis. Pathological CAD variants cause a developmental and epileptic encephalopathy which is highly responsive to uridine supplements. CAD deficiency is difficult to diagnose because symptoms are nonspecific, there is no biomarker, and the protein has over 1000 known variants. To improve diagnosis, we assessed the pathogenicity of 20 unreported missense CAD variants using a growth complementation assay that identified 11 pathogenic variants in seven affected individuals; they would benefit from uridine treatment. We also tested nine variants previously reported as pathogenic and confirmed the damaging effect of seven. However, we reclassified two variants as likely benign based on our assay, which is consistent with their long-term follow-up with uridine. We found that several computational methods are unreliable predictors of pathogenic CAD variants, so we extended the functional assay results by studying the impact of pathogenic variants at the protein level. We focused on CAD's dihydroorotase (DHO) domain because it accumulates the largest density of damaging missense changes. The atomic-resolution structures of eight DHO pathogenic variants, combined with functional and molecular dynamics analyses, provided a comprehensive structural and functional understanding of the activity, stability, and oligomerization of CAD's DHO domain. Combining our functional and protein structural analysis can help refine clinical diagnostic workflow for CAD variants in the genomics era. Beyond genetics: Deciphering the impact of missense variants in CAD deficiency.,Del Cano-Ochoa F, Ng BG, Rubio-Del-Campo A, Mahajan S, Wilson MP, Vilar M, Rymen D, Sanchez-Pintos P, Kenny J, Ley Martos M, Campos T, Wortmann SB, Freeze HH, Ramon-Maiques S J Inherit Metab Dis. 2023 Aug 4. doi: 10.1002/jimd.12667. PMID:37540500 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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