2QYM

crystal structure of unliganded PDE4C2

Domain Annotation: SCOP Classification SCOP Database (version: 2.0) Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species
A	d2qyma_	All alpha proteins	HD-domain/PDEase-like	HD-domain/PDEase-like	PDEase	automated matches	human (Homo sapiens ) [TaxId: 9606 ]

Domain Annotation: CATH CATH Database (version 4.2.0) Homepage

Chain	Domain	Class	Architecture	Topology	Homology
A	1.10.1300.10	Mainly Alpha	Orthogonal Bundle	Catalytic domain of cyclic nucleotide phosphodiesterase 4b2b	3'5'-cyclic nucleotide phosphodiesterase, catalytic domain

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Identifier	Description	Comments	Source
A	PF18100	Phosphodiesterase 4 upstream conserved regions (UCR) (PDE4_UCR)	Phosphodiesterase 4 upstream conserved regions (UCR)	This is the upstream conserved region (UCR) found in Phosphodiesterase 4 (PDE4) enzymes. PDE4 is a contributor to intracellular signalling and an important drug target. The four members of this enzyme family (PDE4A to -D) are functional dimers in whi ...	This is the upstream conserved region (UCR) found in Phosphodiesterase 4 (PDE4) enzymes. PDE4 is a contributor to intracellular signalling and an important drug target. The four members of this enzyme family (PDE4A to -D) are functional dimers in which each subunit contains two upstream conserved regions (UCR), UCR1 and -2, which precede the C-terminal catalytic domain Pfam:PF00233 . Due to alternative promoters/start sites and variable mRNA splicing, transcription from the four PDE4 genes results in the expression of more than 25 different isoforms of PDE4. Each isoform has a unique N-terminal region that determines its specific subcellular localization by mediating interactions with scaffolding proteins. The isoforms are further classified into long, short, and supershort forms based on the presence or absence of two upstream conserved regions (UCRs, known as UCR1 and UCR2). Long splice variants contain both UCR1 and UCR2, short variants lack UCR1, and the supershort forms of PDE4 additionally lack part of UCR2. The extent to which UCRs are present determines critical functional differences between the isoforms. Phosphorylation by protein kinase A (PKA) at a conserved site on UCR1 activates all long PDE4 isoforms. Mutation and deletion studies have shown that long forms of PDE4 are dimeric, with key dimerization interactions mediated by UCR1 and UCR2, and that the C-terminal half of UCR2 could play a negative regulatory role [1].	Domain
A	PF00233	3'5'-cyclic nucleotide phosphodiesterase (PDEase_I)	3'5'-cyclic nucleotide phosphodiesterase	-	Domain

Gene Product Annotation Gene Product Annotation

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Phosphodiesterase 4C	catalytic activity cyclic-nucleotide phosphodiesterase activity 3',5'-cyclic-nucleotide phosphodiesterase activity 3',5'-cyclic-AMP phosphodiesterase activity phosphoric diester hydrolase activity hydrolase activity hydrolase activity, acting on ester bonds phosphoric ester hydrolase activity binding ion binding cation binding metal ion binding		cilium cell projection organelle cellular anatomical entity plasma membrane bounded cell projection intracellular anatomical structure cytoplasm cytosol extracellular region extracellular space nucleus membrane-bounded organelle intracellular organelle intracellular membrane-bounded organelle perinuclear region of cytoplasm

RCSB PDB is funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.