| 2009 |
The C-terminal PUL domain of PLAA (human ortholog of yeast Doa1/Ufd3) forms a 6-mer Armadillo-containing domain whose positively charged inner ridge binds the C-terminus of p97/Cdc48; Tyr805 of p97 is buried in this ridge and implicated in phosphorylation-dependent regulation. Point mutants disrupting this interaction display only partial loss-of-function phenotypes, indicating the p97-PLAA interaction is required for a subset of PLAA-dependent processes. |
Crystal structure of PUL domain–p97 C-terminal peptide complex; structure-guided mutagenesis of yeast Doa1; functional complementation assays in doa1Δ cells |
The Journal of biological chemistry |
High |
19887378
|
| 2010 |
Crystal structure of the PFU-PUL domain pair of yeast Doa1 at 1.9 Å reveals that the PUL domain adopts an Armadillo-like repeat fold with a positively charged concave surface that binds the negatively charged C-terminus of Cdc48; the PFU domain conserved surface is implicated in binding ubiquitin and Hse1. Structural comparison with Ufd2 suggests Doa1 and Ufd2 compete for Cdc48 binding to dictate fate of ubiquitinated proteins. |
X-ray crystallography at 1.9 Å resolution; structural comparison |
The Kobe journal of medical sciences |
Medium |
21063153
|
| 2008 |
The PFU domain of yeast Doa1 binds directly to the SH3 domain of Hse1 (component of the ESCRT machinery), mediating Doa1's role in endosomal sorting. Loss of Doa1 causes missorting of MVB cargo GFP-Cps1 and reduces flux of ubiquitinated membrane proteins through the MVB pathway. This function is genetically separable from Doa1's role in maintaining ubiquitin levels. |
Direct binding assay (Hse1-SH3 pulldown of Doa1-PFU); site-directed mutations blocking PFU–SH3 interaction; GFP-Cps1 sorting assay; synthetic growth defect in doa1Δ vps27Δ double mutant; ubiquitin overexpression epistasis |
The Journal of biological chemistry |
High |
18508771
|
| 2014 |
Solution structure of the Doa1/PFU:Hse1/SH3 complex determined by SAXS combined with molecular docking; Asn-438 of Doa1/PFU and Trp-254 of Hse1/SH3 are critical residues for the interaction (hydrogen bonding), whereas Phe-434, implicated in ubiquitin binding, is not required for this interaction. |
Small-angle X-ray scattering (SAXS); molecular docking; mutagenesis; biochemical binding assays |
Biochemical and biophysical research communications |
Medium |
24607902
|
| 2016 |
Upon lysosomal damage, p97 translocates to lysosomes and cooperates with cofactors UBXD1, PLAA, and the deubiquitylase YOD1 (termed ELDR components) to selectively remove K48-linked ubiquitin conjugates from a subpopulation of damaged lysosomes and promote autophagosome formation. This complex acts downstream of K63-linked ubiquitination and p62 recruitment. |
Co-immunoprecipitation of p97 with PLAA, UBXD1, YOD1; lysosomal damage assay (LLOMe); immunofluorescence localization; analysis of p97 disease-mutant MEFs and patient tissue; tau fibril endocytosis model |
The EMBO journal |
High |
27753622
|
| 2016 |
Yeast Doa1 (PLAA ortholog) forms a functional complex with Cdc48-Ufd1-Npl4 to mediate mitochondria-associated degradation (MAD) of ubiquitinated outer-membrane proteins. Doa1 directly interacts with ubiquitinated substrates and facilitates their recruitment to the Cdc48 complex. Loss of DOA1 causes accumulation and mislocalization of substrates on mitochondria, and is critical for cell survival under mitochondrial oxidative stress. |
Genetic screen for MAD regulators; Co-immunoprecipitation of Doa1 with Cdc48-Ufd1-Npl4; ubiquitinated substrate binding assay; doa1Δ phenotypic analysis under oxidative and ER stress |
The Journal of cell biology |
High |
27044889
|
| 2015 |
Yeast Doa1 forms a SUMO-specific ternary complex with Cdc48 and Wss1 metalloprotease. Upon DNA damage, this Wss1/Cdc48/Doa1 complex is recruited to sumoylated targets and the Wss1 protease catalyzes SUMO chain extension (SUMO ligase activity) and subsequent self-cleavage and proteolysis. Doa1 acts as the adaptor in this complex. Upon genotoxic stress, Wss1 (and by extension the complex) is vacuolar. |
Co-immunoprecipitation (Wss1/Cdc48/Doa1 complex); in vitro SUMO ligase assay; genetic analysis (smt3-331, Camptothecin, UV); localization by fluorescence microscopy |
eLife |
High |
26349035
|
| 2006 |
Yeast Doa1 channels ubiquitin from the proteasomal degradation pathway into pathways mediating DNA damage-induced ubiquitination of PCNA (monoubiquitination) and histone H2B monoubiquitination. In doa1Δ cells, damage-induced PCNA ubiquitination is absent; H2B ubiquitination is reduced basally and absent after DNA damage. The PCNA defect is rescued by ubiquitin overexpression but H2B monoubiquitination is not, indicating an additional specific role for Doa1 in H2B ubiquitination beyond simply supplying ubiquitin. |
Genetic interactions (doa1Δ with rad6, rad18, rad5, ubc13, mms2, bre1, lge1, cdc73, ubp8, ubp10, htb2); Western blot for PCNA-Ub and H2B-Ub; ubiquitin overexpression rescue experiments |
Molecular and cellular biology |
High |
16705165
|
| 2017 |
Hypomorphic mutations in PLAA in humans and mice cause infantile-lethal neurodysfunction with seizures. PLAA functions as a ubiquitin adaptor protein for endolysosomal degradation; Plaa mutant neurons accumulate K63-polyubiquitylated proteins and synaptic membrane proteins, disrupting synaptic vesicle recycling and neurotransmission. |
Human genetics (biallelic PLAA mutations); mouse Plaa mutant model; immunofluorescence for K63-ubiquitylated proteins; synaptic vesicle recycling assays; electrophysiology of neurotransmission |
American journal of human genetics |
High |
28413018
|
| 2024 |
De novo missense variants affecting conserved residues within the PUL domain of PLAA reduce PLAA–p97/VCP interaction, as shown by in vitro studies, and are associated with perturbed vesicle recycling. Computational modeling showed abnormal chain arrangements at the C-terminal PUL domain. |
Exome/genome sequencing; in vitro PLAA–p97 interaction assay with patient variants; computational structural modeling |
Frontiers in molecular neuroscience |
Medium |
38650658
|
| 2005 |
PLAA (phospholipase A2-activating protein) is required for 1α,25(OH)2D3-dependent PKCα activation in rat growth plate chondrocytes. PLAA peptide increases arachidonic acid release and PLA2-specific activity in plasma membranes and matrix vesicles; its effect on PKC is blocked by PLA2 inhibitors (quinacrine, AACOCF3) and cyclooxygenase inhibitor indomethacin, indicating PLAA activates PLA2 leading to prostaglandin production acting via EP1 receptor. PLAA peptide also activates PLC-β1 and PLC-β3 via lysophospholipid. |
PLAA peptide treatment of primary chondrocytes; arachidonic acid release assay; PLA2 activity assay; PKC isoform activity measurement; pharmacological inhibitor studies; PLC isoform assays |
Journal of cellular physiology |
Medium |
15368540
|
| 2014 |
PLAA and its membrane receptor partner Pdia3 are required for rapid 1α,25(OH)2D3-mediated activation of CaMKII in growth zone chondrocytes. Caveolae disruption abolishes CaMKII activation by 1α,25(OH)2D3 or PLAA peptide. Immunoprecipitation shows increased CaM binding to PLAA in response to 1α,25(OH)2D3, suggesting CaM links PLAA to CaMKII. |
Antibody blocking of PLAA and Pdia3; PLAA peptide treatment; caveolae disruption; CaMKII activity assay; co-immunoprecipitation of PLAA with calmodulin |
Connective tissue research |
Medium |
25158196
|
| 2008 |
PLAA overexpression in HeLa cells increases PGE2, IL-6, activated cytosolic PLA2, COX-2, and NF-κB in response to TNF-α. PLAA promotes annexin A4 downregulation (annexin A4 acts as a PLA2 inhibitor) and clusterin downregulation, thereby amplifying PLA2-dependent inflammation. The plaa promoter contains a stimulatory Sp1-binding element in exon 1 that maintains basal expression and an inhibitory element. |
plaa(high)/plaa(low) HeLa Tet-off cell system; ELISA for PGE2, IL-6; Western blot for COX-2, NF-κB; microarray followed by functional assays; luciferase reporter assay; Sp1 decoy oligonucleotides and competitive binding assays |
Cellular signalling |
Medium |
18291623
|
| 2009 |
PLAA overexpression enhances cisplatin-induced apoptosis in HeLa cells through: (1) accumulation of arachidonic acid causing mitochondrial cytochrome c leakage (blocked by siRNA-PLAA, rescued by exogenous arachidonic acid); (2) downregulation of cytoprotective clusterin; (3) upregulation of pro-apoptotic IL-32; (4) activation of JNK/c-Jun and FasL. PLAA induction by cisplatin also activates PLA2. |
plaa(high)/plaa(low) HeLa Tet-off cell system; siRNA-PLAA knockdown; caspase 3/8/9 activity assay; cytochrome c release assay; arachidonic acid rescue; proteomics for phospho-JNK/c-Jun and FasL |
Cellular signalling |
Medium |
19258036
|
| 2022 |
PLAA inhibits the stability of METTL3 protein via ubiquitin-mediated degradation, reducing METTL3 expression, which in turn decreases TRPC3 mRNA stability (via m6A modification). Loss of PLAA leads to elevated METTL3, increased TRPC3, and enhanced intracellular Ca2+ signaling promoting ovarian cancer cell migration and invasion. |
PLAA overexpression/knockdown in ovarian cancer cell lines; ubiquitin-mediated METTL3 degradation assay; m6A-seq/MeRIP for TRPC3 mRNA; TRPC3 Ca2+ channel activity measurement; orthotopic xenograft mouse model |
Oncogene |
Medium |
35869392
|
| 2025 |
The C. elegans PLAA ortholog UFD-3 directly interacts with the mRNA decapping complex regulatory subunit DCAP-1, and UFD-3's intrinsic disordered region (IDR) is required for recruitment of DCAP-1 to P-bodies. Loss of the IDR does not affect UFD-3's role in sorting ubiquitinated proteins through the MVB pathway, demonstrating that PLAA/UFD-3 regulates P-bodies through a pathway distinct from ubiquitin-dependent protein degradation. |
C. elegans genetics; unbiased proteomics (neuronal interactome); in vitro biochemical interaction assay (UFD-3–DCAP-1 direct binding); fluorescence imaging of P-bodies in C. elegans; IDR deletion mutant analysis |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
40560612
|