| 2000 |
PEX19 binds a broad spectrum of peroxisomal membrane proteins (PMPs) in the cytoplasm, is predominantly cytosolic at steady state, and its mislocalization to the nucleus causes nuclear accumulation of newly synthesized PMPs; loss of PEX19 leads to degradation or mistargeting of PMPs to mitochondria, establishing PEX19 as required for peroxisome membrane synthesis. |
Co-immunoprecipitation, subcellular fractionation, mislocalization assay, loss-of-function in PEX19-deficient cells |
The Journal of cell biology |
High |
10704444
|
| 1999 |
Human PEX19 encodes a 299-aa hydrophilic protein with a C-terminal CAAX farnesylation motif; farnesylated PEX19 is partly anchored in the peroxisomal membrane with its N-terminal region exposed to the cytosol; PEX19 is required for peroxisome membrane assembly at an early stage, before matrix protein import. |
Functional complementation of CHO mutant ZP119, mutation analysis in Zellweger patient, immunolocalization |
Proceedings of the National Academy of Sciences of the United States of America |
High |
10051604
|
| 2004 |
PEX19 functions as both a cytosolic chaperone and an import receptor for newly synthesized class 1 PMPs: it binds and stabilizes PMPs in the cytosol, interacts with hydrophobic PMP targeting signals (mPTSs), and is essential for class 1 PMP targeting and import; class 2 mPTSs are PEX19-independent. |
In vitro binding assays, PMP stabilization assays, complementation in PEX19-deficient cells, RNAi knockdown |
The Journal of cell biology |
High |
14709540
|
| 2004 |
PEX3 is the docking factor for PEX19 at the peroxisomal membrane: PEX3 is required for PEX19 docking at peroxisomes, interacts specifically with the N-terminal docking domain of PEX19 via a conserved motif, is sufficient to dock PEX19 at heterologous organelles, and its transient inhibition abrogates class 1 PMP import but not class 2 or matrix protein import. |
Co-immunoprecipitation, heterologous targeting assay, transient inhibition/dominant-negative, complementation in PEX3-deficient cells |
The Journal of cell biology |
High |
15007061
|
| 2006 |
The tail-anchored peroxisomal membrane protein PEX26 contains two PEX19-binding sites in its C-terminal targeting signal: one overlapping with the transmembrane domain and one in the luminal domain; the luminal PEX19-binding site is essential for correct peroxisomal targeting and prevents mislocalization to mitochondria; PEX19 is required for PEX26 import. |
Deletion/mutation analysis, heterologous targeting assay, co-immunoprecipitation, PEX19 knockdown |
Journal of cell science |
High |
16763195
|
| 2005 |
PEX19-binding sites on peroxisomal membrane proteins (including ALDP/adrenoleukodystrophy protein) serve as targeting motifs; the identified PEX19-binding site of ALDP is bound by both human and yeast PEX19 and is required for peroxisomal targeting in human fibroblasts and in yeast, demonstrating evolutionary conservation of PMP targeting signals. |
Peptide array binding, in vivo targeting assays in human fibroblasts and yeast, deletion mutagenesis |
The Journal of biological chemistry |
High |
15781447
|
| 2009 |
The N-terminal domain of Pex14 (Pex14N) adopts a three-helical fold and binds both Pex5 and Pex19 competitively at the same surface but with opposite directionality; a conserved F/YFxxxF motif in PEX19 mediates this interaction; mutations of Pex14 residues in the binding region disrupt Pex5/Pex19 binding in vitro and impair Pex14 peroxisomal membrane localization in vivo. |
Crystal structure, NMR, mutagenesis, in vitro binding, in vivo localization assay |
The EMBO journal |
High |
19197237
|
| 2010 |
Crystal structure of the cytosolic domain of PEX3 in complex with a PEX19-derived peptide reveals that PEX3 adopts a novel large helical bundle fold with a hydrophobic groove at its membrane-distal end that engages the PEX19 peptide with nanomolar affinity; phenylalanine 29 of PEX19 is critical for the PEX3-PEX19 interaction. |
X-ray crystallography, mutagenesis, binding affinity measurements |
The Journal of biological chemistry |
High |
20554521
|
| 2003 |
The PEX3-PEX19 interaction occurs predominantly at the peroxisomal membrane in living cells; the PEX19-binding domain in the C-terminal half of PEX3 is required for peroxisomal localization; deletion of the PEX3 N-terminal targeting sequence or the PEX19-binding domain mislocalizes PEX3 and abolishes interaction with PEX19. |
FRET imaging (EYFP/ECFP fusion proteins), donor photobleaching, complementation in PEX3- and PEX19-deficient fibroblasts |
European journal of cell biology |
High |
12924628
|
| 2013 |
PEX19 forms a cytosolic complex with the tail-anchored peroxisomal membrane protein PEX26 and translocates it directly to peroxisomes by interacting with PEX3; this pathway is TRC40-independent; basic amino acids in the luminal domain of PEX26 are essential for PEX19 binding and peroxisomal targeting. |
Co-immunoprecipitation, dominant-negative/siRNA knockdown, mutagenesis, in vivo targeting assay |
The Journal of cell biology |
High |
23460677
|
| 2017 |
Farnesylation of PEX19 at its C-terminal CaaX motif allosterically reshapes the PEX19 C-terminal domain to form two hydrophobic pockets that recognize conserved aromatic/aliphatic side chains in PMPs; the farnesyl moiety is buried in an internal hydrophobic cavity inducing conformational changes; mutations abolishing farnesyl contacts or PMP recognition prevent cargo binding and cannot complement a ΔPEX19 phenotype in Zellweger patient fibroblasts. |
NMR structure of farnesylated PEX19 CTD, mutagenesis, in vivo complementation in patient fibroblasts |
Nature communications |
High |
28281558
|
| 2012 |
Mutagenesis of the PEX19-binding region of PEX3 reduces PEX19 affinity and destabilizes PEX3; the PEX3-PEX19 complex is required for de novo formation of peroxisomes; a hydrophobic groove near the base of PEX3 is involved in PMP insertion into the membrane. |
Site-directed mutagenesis, in vitro binding assays, functional complementation in peroxisome-deficient cells |
Traffic (Copenhagen, Denmark) |
High |
22624858
|
| 2002 |
PEX19 is farnesylated in vitro and in vivo at its C-terminal CAAX motif; two splice variants differ in biological activity: PEX19ΔE8 (lacking domain D3/CAAX) restores peroxisomal biogenesis in PEX19-deficient fibroblasts and interacts with PEX3, demonstrating that farnesylation is not absolutely essential; PEX19ΔE2 (lacking N-terminal domain D1) fails to restore biogenesis and cannot interact with PEX3 lacking its peroxisomal targeting region. |
In vitro farnesylation assay, co-immunoprecipitation, functional complementation in PEX19-deficient fibroblasts |
Biochemical and biophysical research communications |
Medium |
11883941
|
| 2017 |
Deletion mapping in Pichia pastoris defines the minimum N-terminal (aa 1-150) and C-terminal (aa 89-300) regions of Pex19 required for peroxisome biogenesis; N-terminal deletions disrupt Pex3 binding while preserving Pex10 interaction; C-terminal deletions disrupt PMP (Pex10) binding while preserving Pex3 interaction; Pex25 overexpression can partially rescue Pex19 C-terminal truncation by enhancing Pex3 interaction. |
Deletion mutagenesis, co-immunoprecipitation, growth assay, yeast genetics |
The Journal of biological chemistry |
Medium |
28526747
|
| 2018 |
In budding yeast, Pex19 acts as an import mediator for a subset of mitochondrial tail-anchored (TA) proteins (Fis1 and Gem1); deletion of PEX19 causes growth defects under respiratory conditions, altered mitochondrial morphology, reduced steady-state levels of Fis1 and Gem1, and hampered in organello import of these TA proteins; recombinant Pex19 directly binds Fis1 and Gem1. |
Yeast genetics (PEX19 deletion), in organello import assay, direct binding with recombinant proteins, steady-state level analysis |
Traffic (Copenhagen, Denmark) |
High |
30033679
|
| 2014 |
PEX19 is an intrinsically disordered protein; upon interaction with PEX3, three regions of PEX19 become protected from hydrogen exchange (N-terminus, a middle stretch F64-L74, and C-terminus), while PEX3 becomes more protected in its binding groove; the N-terminus of PEX19 initiates binding to PEX3, followed by subtle conformational changes in PEX3 that allow higher-affinity engagement via folding of a short helix in PEX19. |
Hydrogen exchange mass spectrometry |
PloS one |
Medium |
25062251
|
| 2022 |
Pex11 contains one Pex19-binding site (Pex19-BS) required for Pex19-mediated membrane insertion but non-essential for peroxisomal trafficking; Pex19 acts as a chaperone by binding Pex19-BS in Pex11 and preventing spontaneous Pex11 oligomerization and aggregation; Pex11 also has a second, Pex19-independent mPTS for peroxisomal trafficking. |
Mutagenesis, co-immunoprecipitation, in vivo targeting assay, aggregation assay in Pichia pastoris |
Cells |
Medium |
35011719
|
| 2022 |
Non-farnesylated PEX19 is sufficient to restore peroxisomal metabolic activity, while farnesylated PEX19 specifically controls lipid droplet (LD) protein composition and neutral lipid metabolism through a peroxisome-independent mechanism; in the absence of PEX19-dependent LD proteome, cells accumulate excess triacylglycerols and fail to deplete neutral lipid stores. |
Farnesylation mutant analysis, systems-level proteomics, lipid quantification, rescue experiments in PEX19-deficient cells |
Frontiers in cell and developmental biology |
Medium |
35557938
|
| 2024 |
A conserved PEX19 helix (αd) prevents improper exposure of the PEX26 transmembrane domain (TMD) to cytosolic chaperones, and the αd helix also interacts with the cytosolic domain of the PEX3 receptor to trigger PEX26 release at the correct destination membrane; the PEX3-G138E mutant abolishes this secondary interaction, preventing PEX3-induced PEX26 release from PEX19. |
Biochemical analysis, mass spectrometry, mutagenesis, in vivo targeting assay |
iScience |
Medium |
38585659
|
| 2021 |
Viperin (an interferon-stimulated gene product) binds PEX19 as a physical interaction partner; viperin colocalizes with peroxisomal proteins and its augmentation of RIG-I-like receptor (RLR) signaling requires PEX19 expression; knockdown of PEX19 abolishes viperin-mediated augmentation of innate antiviral signaling. |
Proteomics-based screening, co-immunoprecipitation, colocalization, RNAi knockdown with functional readout (IFN-β induction) |
Life science alliance |
Medium |
34108265
|
| 2025 |
In yeast, newly synthesized Pex15 is targeted to peroxisomes primarily via the Pex19-Pex3-dependent pathway; mistargeted Pex15 on mitochondria is extracted by the AAA-ATPase Msp1 and transferred to the ER for degradation or re-routed to peroxisomes via the Pex19-Pex3 pathway; even correctly localized peroxisomal Pex15 is extracted by peroxisomal Msp1 but returned to peroxisomes via Pex19-Pex3, revealing a dynamic quality-control cycle. |
Yeast genetics (deletion mutants), in vivo localization, epistasis analysis |
The FEBS journal |
Medium |
40344504
|
| 2017 |
In Drosophila Pex19 mutants, loss of peroxisomes leads to HNF4-induced lipotoxicity: hyperactive HNF4 signaling upregulates lipase 3 and mitochondrial β-oxidation enzymes, resulting in enhanced lipolysis, elevated free fatty acids, and mitochondrial damage; increased acid lipase expression and free fatty acid accumulation are also observed in PEX19-deficient human patient fibroblasts. |
Drosophila Pex19 mutant analysis, genetic epistasis (Hnf4), patient fibroblast biochemical analysis |
Molecular biology of the cell |
Medium |
29282281
|