Affinage

OAZ1

Ornithine decarboxylase antizyme 1 · UniProt P54368

Length
228 aa
Mass
25.4 kDa
Annotated
2026-04-29
36 papers in source corpus 10 papers cited in narrative 10 extracted findings

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

OAZ1 (Zfp423) is a multi-zinc finger transcriptional cofactor that operates in two distinct signaling contexts—BMP-Smad signaling and olfactory/lymphocyte differentiation—using mutually exclusive zinc finger clusters (PMID:10660046). In the BMP pathway, OAZ1 forms a complex with Smad1/4 to bind BMP response elements and activate target genes including Smad6, thereby establishing a negative feedback loop that attenuates BMP signaling; the coactivator PARP1 is required for this transcriptional output (PMID:16373339, PMID:14623329). Through a separate C-terminal domain, OAZ1 interacts with Olf-1/EBF transcription factors to coordinate stage-specific gene expression during olfactory receptor neuron differentiation and is essential for CNS midline patterning and cerebellar development (PMID:17521568, PMID:17524391, PMID:23035080). OAZ1 also functions as a negative regulator of polyamine biosynthesis by promoting ornithine decarboxylase (ODC) degradation through a polyamine-responsive +1 ribosomal frameshift mechanism, directly coupling intracellular polyamine concentration to OAZ1 protein production (PMID:27215166).

Mechanistic history

Synthesis pass · year-by-year structured walk · 8 steps
  1. 2000 High

    Establishing that OAZ1 is a bifunctional transcriptional cofactor resolved how a single zinc finger protein participates in two unrelated signaling pathways (BMP-Smad and Olf-1/EBF) by using structurally separable finger clusters.

    Evidence Co-immunoprecipitation, DNA binding assays, and zinc finger cluster mutagenesis with reporter assays in Xenopus

    PMID:10660046

    Open questions at the time
    • No structural basis for mutual exclusivity of the two finger clusters
    • In vivo requirement in mammalian systems not yet shown
  2. 2002 Medium

    Demonstrating direct OAZ DNA binding to BMP-responsive promoter elements alongside Smads confirmed OAZ as a bona fide transcriptional effector rather than merely a Smad-tethered coactivator.

    Evidence EMSA and promoter reporter dissection in Xenopus using the Xretpos retrotransposon promoter

    PMID:12136093

    Open questions at the time
    • Binding specificity defined on a single promoter; genome-wide binding sites unknown
    • Functional relevance of the Xretpos target in normal development unclear
  3. 2003 Medium

    Identification of PARP1 as an enzymatically required coactivator of OAZ-dependent BMP target gene transcription revealed that OAZ recruits chromatin-modifying machinery to execute its transcriptional program.

    Evidence Co-immunoprecipitation and reporter assays with catalytically dead PARP1 mutant

    PMID:14623329

    Open questions at the time
    • Interaction shown only by Co-IP; no reciprocal validation or endogenous ChIP
    • Whether PARP1 modifies OAZ itself or chromatin at target loci is unresolved
  4. 2005 High

    Showing that OAZ-Smad1/4 directly activates the Smad6 promoter to create a negative feedback loop on BMP signaling established the physiological logic of OAZ function: it limits the duration of BMP responses.

    Evidence ChIP, reporter assays, siRNA knockdown and overexpression with phospho-Smad1 western blotting in embryonal carcinoma, myoblast, and smooth muscle cells

    PMID:16373339

    Open questions at the time
    • Whether feedback loop operates in all BMP-responsive tissues or is context-dependent
    • How OAZ levels themselves are regulated in response to BMP signaling
  5. 2007 High

    Genetic loss-of-function in mice demonstrated that OAZ is essential for olfactory receptor neuron maturation and CNS midline/cerebellar development, translating the in vitro bifunctionality into defined in vivo developmental roles.

    Evidence Conditional and conventional knockout mice with histology, immunostaining, in situ hybridization, and axon tracing

    PMID:17521568 PMID:17524391

    Open questions at the time
    • Relative contributions of BMP-Smad versus Olf/EBF modules to the cerebellar phenotype not dissected
    • Downstream transcriptional targets in cerebellar development not identified genome-wide
  6. 2012 High

    A domain-specific knock-in mutant disrupting only the OAZ–O/E interaction proved that the Olf/EBF-binding module is dispensable for initial olfactory neuron specification but essential for mature neuron identity, cleanly separating the two functional arms in vivo.

    Evidence Knock-in mouse expressing C-terminal deletion mutant (OAZΔC) with immunostaining and in situ hybridization

    PMID:23035080

    Open questions at the time
    • Reciprocal knock-in disrupting only BMP-Smad binding not generated
    • Molecular targets unique to each module not defined by transcriptomics
  7. 2016 Medium

    Functional genomic screening established that OAZ1 constrains polyamine biosynthesis by promoting ODC degradation, linking OAZ1 to metabolic regulation of translation beyond its transcription factor role.

    Evidence Genome-wide RNAi screen, targeted siRNA knockdown in HEK293 cells with HPLC polyamine measurement

    PMID:27215166

    Open questions at the time
    • Mechanism of ODC degradation promotion not molecularly defined
    • Whether the polyamine-regulatory function is independent of OAZ1's transcriptional activity is unclear
  8. 2019 Medium

    Epigenetic regulation of OAZ1 expression via HDAC-mediated histone H4 deacetylation at its promoter, coupled with the finding that OAZ1 knockdown reduces cisplatin sensitivity, connected OAZ1 to drug resistance in cancer cells.

    Evidence ChIP for Ac-H4 at OAZ1 promoter, siRNA knockdown, colony formation and migration assays in cisplatin-resistant NSCLC cells

    PMID:31127087

    Open questions at the time
    • Whether cisplatin sensitivity effect operates through polyamine regulation or transcriptional cofactor activity is unknown
    • Generalizability beyond a single NSCLC resistance model not tested

Open questions

Synthesis pass · forward-looking unresolved questions
  • The relationship between OAZ1's two established roles—polyamine-responsive translational regulation via ribosomal frameshifting and zinc finger-mediated transcriptional cofactor activity—remains mechanistically unintegrated; whether these represent independent functions of alternatively translated products or a coordinated regulatory circuit is unknown.
  • No genome-wide map of OAZ1 chromatin occupancy in mammalian cells
  • Structural basis for mutually exclusive zinc finger cluster usage not determined
  • Whether polyamine levels feed back on OAZ1 transcriptional cofactor activity is untested

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0140110 transcription regulator activity 4 GO:0003677 DNA binding 2
Localization
GO:0005634 nucleus 4
Pathway
R-HSA-1266738 Developmental Biology 3
Partners
EBF1ODC1PARP1SMAD1SMAD4

Evidence

Reading pass · 10 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2000 OAZ (Zfp423) uses distinct zinc finger clusters for two separate signaling pathways: one cluster of fingers binds Smad1/4 and the BMP response element of Xvent-2, while a separate cluster interacts with Olf-1/EBF transcription factors in olfactory/lymphocyte development. These modules are mutually exclusive. Co-immunoprecipitation, DNA binding assays, domain-mapping with zinc finger cluster mutants, transcriptional reporter assays in Xenopus Cell High 10660046
2005 Upon BMP4 stimulation, an OAZ-Smad1/4 complex binds to and transcriptionally activates the Smad6 gene promoter, thereby creating a negative feedback loop that attenuates BMP signaling. Removal of OAZ prolongs Smad1 phosphorylation, while forced OAZ expression accelerates Smad6 induction and reduces Smad1 phosphorylation. ChIP, reporter assays, siRNA knockdown and overexpression in embryonal carcinoma, myoblast, and smooth muscle cells; phospho-Smad1 western blotting The Journal of biological chemistry High 16373339
2003 Poly(ADP-ribose) polymerase 1 (Parp1) physically associates with OAZ and acts as a transcriptional coactivator of OAZ-dependent BMP target genes (Xvent-2 and Smad6). The poly(ADP-ribose) polymerase catalytic activity of Parp1 is required for this transcriptional activation. Co-immunoprecipitation, transcriptional reporter assays using wild-type and catalytically dead Parp1 mutants Biochemical and biophysical research communications Medium 14623329
2007 Zfp423/OAZ is transiently expressed in newly differentiating olfactory receptor neurons (ORNs) and is required for coordinating immature versus mature stage-specific gene expression. OAZ deletion in mice impairs ORN axonal projection patterns; sustained OAZ expression arrests ORN development at an immature stage; reintroduction of OAZ in mature ORNs suppresses mature markers and reactivates immature-specific markers. Conditional mouse knockout, gain-of-function transgenic mice, immunostaining, in situ hybridization Neuron High 17521568
2007 Zfp423/OAZ is required for CNS midline patterning and cerebellar development. OAZ-deficient mice show reduction of the cerebellar vermis, defects in Purkinje cell differentiation and granule cell proliferation, and failure of dorsal telencephalic commissural axons to cross the midline. Mouse knockout, histology, immunostaining, axon tracing Developmental biology High 17524391
2012 The C-terminal domain of OAZ mediates its interaction with Olf/EBF (O/E) transcription factors, and this interaction is essential for olfactory sensory neuron differentiation and maturation. A C-terminal deletion mutant (OAZΔC) that selectively disrupts OAZ–O/E interaction while retaining BMP signaling activity shows apparently normal OSN differentiation, demonstrating that O/E-mediated processes are indispensable for the mature ORN phenotype. Knock-in mouse expressing domain-specific OAZ mutant, immunostaining, in situ hybridization The Journal of neuroscience High 23035080
2002 Smads and OAZ protein bind to their respective response elements (Smad-binding elements and OAZ binding sites) in the Xretpos retrotransposon promoter, and both bindings are required for BMP-4-induced transcriptional activation, placing OAZ as a direct transcriptional mediator of BMP-4 signaling in Xenopus. Electrophoretic mobility shift assay (EMSA), promoter reporter assays, loss-of-function experiments in Xenopus Nucleic acids research Medium 12136093
2019 HDAC activity directly represses OAZ1 expression by reducing histone H4 acetylation at the OAZ1 promoter in cisplatin-resistant NSCLC cells. HDAC inhibitor S11 increases Ac-H4 accumulation at the OAZ1 promoter and upregulates OAZ1 expression; OAZ1 knockdown decreases cisplatin sensitivity. ChIP assay for Ac-H4 at OAZ1 promoter, siRNA knockdown, colony formation, migration assays, gene microarray Cell death & disease Medium 31127087
2016 Silencing OAZ1 in HEK293 cells increases ornithine decarboxylase (ODC) enzyme levels and elevates intracellular putrescine and spermidine, leading to enhanced recombinant protein expression without affecting cell viability, demonstrating that OAZ1 limits polyamine biosynthesis and that elevated polyamines enhance translation. Genome-wide RNAi screen, siRNA knockdown, polyamine measurement (HPLC), reporter protein assays Biotechnology and bioengineering Medium 27215166
2024 The polyamine-responsive ribosomal frameshift motif from OAZ1 can be harnessed as a genetically encoded sensor to report real-time intracellular polyamine concentrations in single living cells, demonstrating that OAZ1 frameshifting efficiency is directly coupled to polyamine levels in vivo. Fluorescent reporter construction using OAZ1 frameshift element, live-cell imaging, CRISPR genome-wide screen bioRxivpreprint Medium bio_10.1101_2024.08.24.609500

Source papers

Stage 0 corpus · 36 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2000 OAZ uses distinct DNA- and protein-binding zinc fingers in separate BMP-Smad and Olf signaling pathways. Cell 369 10660046
2009 OAZ-t/OAZ3 is essential for rigid connection of sperm tails to heads in mouse. PLoS genetics 86 19893612
2000 Identification and characterization of testis specific ornithine decarboxylase antizyme (OAZ-t) gene: expression in haploid germ cells and polyamine-induced frameshifting. Genes to cells : devoted to molecular & cellular mechanisms 84 10792465
2008 Tryptophan mutations at azi-etomidate photo-incorporation sites on alpha1 or beta2 subunits enhance GABAA receptor gating and reduce etomidate modulation. Molecular pharmacology 73 18805938
2003 Photoaffinity labeling with a neuroactive steroid analogue. 6-azi-pregnanolone labels voltage-dependent anion channel-1 in rat brain. The Journal of biological chemistry 68 12560326
2007 Zfp423/OAZ participates in a developmental switch during olfactory neurogenesis. Neuron 58 17521568
2001 Beneficial effect of glycoprotein IIb/IIIa inhibitor (AZ-1) on endothelium in Escherichia coli endotoxin-induced shock. Critical care medicine 55 11395599
2007 The transcription factor Zfp423/OAZ is required for cerebellar development and CNS midline patterning. Developmental biology 54 17524391
2005 OAZ regulates bone morphogenetic protein signaling through Smad6 activation. The Journal of biological chemistry 39 16373339
2000 Nucleotide binding activity of SecA homodimer is conformationally regulated by temperature and altered by prlD and azi mutations. The Journal of biological chemistry 39 10747939
2019 Targeting HDAC/OAZ1 axis with a novel inhibitor effectively reverses cisplatin resistance in non-small cell lung cancer. Cell death & disease 36 31127087
2003 Poly(ADP-ribose) polymerase 1 interacts with OAZ and regulates BMP-target genes. Biochemical and biophysical research communications 28 14623329
2008 Photo-activated azi-etomidate, a general anesthetic photolabel, irreversibly enhances gating and desensitization of gamma-aminobutyric acid type A receptors. Anesthesiology 22 18156888
2016 Genome-scale RNA interference screen identifies antizyme 1 (OAZ1) as a target for improvement of recombinant protein production in mammalian cells. Biotechnology and bioengineering 20 27215166
2012 Zfp423/OAZ mutation reveals the importance of Olf/EBF transcription activity in olfactory neuronal maturation. The Journal of neuroscience : the official journal of the Society for Neuroscience 20 23035080
2017 Effect of Oaz1 overexpression on goose ovarian granulosa cells. Amino acids 18 28324173
2002 Bone morphogenetic protein-4-induced activation of Xretpos is mediated by Smads and Olf-1/EBF associated zinc finger (OAZ). Nucleic acids research 17 12136093
1992 Efficient photoaffinity labeling of human beta-hexosaminidase A. Synthesis and application of 3-azi-1-[(2-acetamido-2-deoxy-1-beta- D-glucopyranosyl)thio]- and -galactopyranosyl)thio]butane. Bioconjugate chemistry 16 1387803
1986 3-Azi-1-methoxybutyl D-maltooligosaccharides specifically bind to the maltose/maltooligosaccharide-binding protein of Escherichia coli and can be used as photoaffinity labels. European journal of biochemistry 14 3533533
2017 OAZ1 knockdown enhances viability and inhibits ER and LHR transcriptions of granulosa cells in geese. PloS one 11 28362829
2003 A commonly deleted region in ovarian cancer on chromosome 19p13.3, not including the OAZ1 gene. International journal of oncology 11 12888889
2024 Deubiquitinating enzyme USP28 inhibitor AZ1 alone and in combination with cisplatin for the treatment of non-small cell lung cancer. Apoptosis : an international journal on programmed cell death 9 39222275
2019 Azi-medetomidine: Synthesis and Characterization of a Novel α2 Adrenergic Photoaffinity Ligand. ACS chemical neuroscience 8 31638765
2013 Assay of OAZ1 mRNA levels in chronic myeloid leukemia combined with application of leukemia PCR array identified relevant gene changes affected by antizyme. Acta haematologica 8 24192781
2007 Association of OAZ1 gene polymorphisms with subclinical and clinical vascular events. Arteriosclerosis, thrombosis, and vascular biology 8 17761941
2024 Diagnostic potential of salivary IL-1β, IL-8, SAT, S100P, and OAZ1 in oral squamous cell carcinoma, oral submucous fibrosis, and oral lichen planus based on findings from a Sri Lankan cohort. Scientific reports 7 39516476
2007 DmOAZ, the unique Drosophila melanogaster OAZ homologue is involved in posterior spiracle development. Development genes and evolution 7 17323106
1997 Genomic organization of the mouse AZ1 gene that encodes the protein localized to preacrosomes of spermatids. Genomics 7 9070930
2021 Mitochondrial phylogenetic and diversity analysis in Azi-Kheli buffalo. Tropical animal health and production 4 34637013
2024 Ame-miR-1-3p of bee venom reduced cell viability through the AZIN1/OAZ1-ODC1-polyamines pathway and enhanced the defense ability of honeybee (Apis mellifera L.). Insect molecular biology 3 38767730
1988 3-Azi-1-methoxybutyl beta-D-galactopyranoside, a photoaffinity label for monoclonal antigalactan antibodies of the VH GAL 39.1/55.1 gene-family. Carbohydrate research 3 3378234
2012 Molecular characterization, tissue expression and nucleotide variation of the porcine AZ1 gene. Gene 2 22310384
2004 [OAZ gene polymorphism in Chinese patients with systemic lupus erythematosus]. Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics 2 15476163
2023 Genetic polymorphism of Β-casein gene and its association with milk production and composition in Azi-Kheli buffalo. Tropical animal health and production 1 36809577
1988 Malto-oligosaccharide homologues of 3,7-anhydro-2-azi-1,2-dideoxy-D-glycero-D-gulo-octitol+ ++: improved photoaffinity reagents for labelling the malto-oligosaccharide-binding protein of Escherichia coli. Carbohydrate research 1 3072080
2026 OAZ1/ CASP8AP2 double knockout enhances recombinant protein production in HEK293 cells through metabolic reprogramming and antiapoptotic effects. Acta biochimica et biophysica Sinica 0 41601258