| 2023 |
Cryo-EM structure of human MBOAT7 revealed that arachidonyl-CoA and lyso-PI access the catalytic center through a twisted tunnel from the cytosol and lumenal sides, respectively. N-terminal residues on the ER lumenal side determine phospholipid headgroup selectivity: swapping N-terminal residues between MBOATs 1, 5, and 7 converts enzyme specificity for different lyso-phospholipids. The structure also enabled virtual screening-based identification of small-molecule inhibitors. |
Cryo-EM structure determination, domain-swap mutagenesis, virtual screening, in vitro acyltransferase assay |
Nature communications |
High |
37316513
|
| 2021 |
Purified recombinant human MBOAT7 preferentially transfers polyunsaturated fatty acids (20:4 arachidonic acid and 20:5 EPA) to lysophosphatidylinositol (LPI). Missense mutations at the putative catalytic dyad residues N321A and H356A, individually or combined, abolish O-acyltransferase activity, establishing these residues as essential catalytic residues. |
In vitro acyltransferase assay with radiolabeled fatty acids using purified recombinant wild-type and mutant MBOAT7 expressed in Pichia pastoris |
Biochimica et biophysica acta. Molecular and cell biology of lipids |
High |
33513444
|
| 2019 |
MBOAT7 is an integral multispanning transmembrane protein anchored to endomembranes with six transmembrane domains. The predicted catalytic dyad (Asn-321 and His-356) has a lumenal localization. This topology was established using solubilization of membrane fractions, GFP/FLAG-tagged truncation constructs, selective membrane permeabilization, co-immunofluorescence, and Fluorescence Protease Protection (FPP) assay in living cells. |
Fluorescence Protease Protection (FPP) assay, selective membrane permeabilization with indirect immunofluorescence, Western blotting, in silico topology prediction (22 methods) |
Journal of structural biology |
High |
30959108
|
| 2012 |
LPIAT1/MBOAT7 is the enzyme responsible for incorporating arachidonic acid (AA) into phosphatidylinositol (PI) in mammals. Lpiat1-knockout mice show near-complete loss of LPIAT activity with arachidonoyl-CoA, reduced AA in PI and PI-phosphates, cortical atrophy, hippocampal atrophy, disordered cortical lamination, delayed neuronal migration, and reduced neurite outgrowth in vitro. |
Gene knockout (Lpiat1−/− mice), in vitro LPIAT activity assay, lipidomics, immunohistochemistry, neurite outgrowth assay |
Molecular biology of the cell |
High |
23097495
|
| 2013 |
LPIAT1/MBOAT7 plays a non-redundant role in maintaining physiological levels of PtdIns and PtdInsP2 through an active deacylation/reacylation (Lands) cycle. Knockout mice show a 26–44% reduction in total PtdIns and PtdInsP2 in brain and liver, a 300–525% increase in C18:0 lyso-PtdIns, and a selective reduction of C38:4 (arachidonoyl-containing) species, with no compensation from other molecular species. |
Gene knockout mouse (LPIAT1−/−), LC-ESI/MS lipidomics of liver and brain |
PloS one |
High |
23472195
|
| 2019 |
Mboat7 loss of function in mice (but not Tmc4 loss) is sufficient to promote NAFLD progression under high-fat diet. Mboat7 knockdown leads to accumulation of lysophosphatidylinositol (LPI) substrates. Direct hepatic administration of LPI promotes inflammatory and fibrotic transcriptional changes in an Mboat7-dependent manner, establishing LPI accumulation as the mechanistic driver of liver disease. |
Antisense oligonucleotide (ASO) knockdown in mice, hepatic LPI administration, transcriptional profiling, lipidomics |
eLife |
High |
31621579
|
| 2020 |
Hepatocyte-specific Lpiat1/MBOAT7 knockout mice develop spontaneous hepatic steatosis and fibrosis on high-fat diet. The mechanism involves increased PI turnover: reduced PI acyl-chain remodeling stimulates both PI synthesis and breakdown; PI degradation by phospholipase C produces diacylglycerol (DAG), a precursor to triglyceride synthesis, fueling steatosis through this non-canonical pathway. |
Hepatocyte-specific Lpiat1 knockout mouse, CRISPR-Cas9 and siRNA depletion in human hepatic cells, radiolabeled glycerol/fatty acid metabolic flux, LC-ESI-MS lipidomics, liver spheroid model |
Gut |
High |
32253259
|
| 2020 |
Hepatocyte-specific deletion of Mboat7 causes spontaneous steatosis characterized by increased hepatic cholesterol ester content and, on a fibrogenic diet, increased fibrosis independent of inflammation. Lipidomics of knockout mice and human rs641738TT carriers both show increased total lysophosphatidylinositol levels and similar alterations in LPI/PI subspecies, indicating inflammation-independent lipid-signaling-mediated fibrogenesis. |
Hepatocyte-specific Mboat7 knockout mouse (Mboat7Δhep), picrosirius staining, hydroxyproline quantification, RNA sequencing, flow cytometry, LC-MS lipidomics of mouse liver and human liver biopsies |
Gut |
High |
32591434
|
| 2021 |
Hepatic deletion of Mboat7 (Mboat7 LSKO mice) causes fatty liver associated with activation of SREBP-1c and increased de novo lipogenesis. Lipidomics showed selective reduction of 20-carbon PUFA-containing phosphatidylinositols. Co-deletion of SREBP cleavage-activating protein (Scap) with Mboat7 normalized hepatic triglycerides, establishing that increased SREBP-1c processing is required for Mboat7 loss-induced steatosis. |
Liver-specific Mboat7 knockout mice, compound Mboat7/Scap double-KO, LC-MS lipidomics, gene expression analysis |
Journal of lipid research |
High |
32859645
|
| 2020 |
Hyperinsulinemia down-regulates hepatic MBOAT7 expression, contributing to steatosis. MBOAT7 deletion in hepatocytes reduces arachidonic acid incorporation into phosphatidylinositol, causes accumulation of saturated triglycerides, enhances lipogenesis, and upregulates fatty acid transporter FATP1. FATP1 deletion rescues the steatosis phenotype, placing FATP1 downstream of MBOAT7 loss. |
CRISPR/Cas9 knockout in HepG2 cells, antisense oligonucleotide silencing in C57Bl/6 mice, siRNA, lipid mass spectrometry, FATP1 rescue experiment |
EBioMedicine |
High |
32058943
|
| 2023 |
MMD (a Golgi-resident scaffold protein) physically interacts with both ACSL4 and MBOAT7, two enzymes that catalyze sequential steps to incorporate arachidonic acid (AA) into phosphatidylinositol (PI). MMD promotes ferroptosis susceptibility in ovarian and renal carcinoma cells in an ACSL4- and MBOAT7-dependent manner by increasing flux of AA into PI, elevating AA-PI and other AA-containing phospholipid species. |
Co-immunoprecipitation (Co-IP) of MMD with ACSL4 and MBOAT7, genome editing (MBOAT7 KO), lipidomics, ferroptosis cell death assays |
Cell reports |
Medium |
37691145
|
| 2020 |
ACSL3 channels arachidonic acid (AA) into phosphatidylinositols to provide LPIAT1/MBOAT7 with an AA pool to sustain elevated prostaglandin synthesis in non-small cell lung cancer. LPIAT1 knockdown suppresses proliferation, anchorage-independent growth, and in vivo tumorigenesis in KrasG12D-driven lung cancer models, establishing an ACSL3-LPIAT1 signaling axis for prostaglandin production. |
siRNA knockdown of LPIAT1 in lung cancer cell lines, KrasG12D mouse models, proliferation and anchorage-independent growth assays, in vivo tumorigenesis assay, lipidomics |
Oncogene |
Medium |
32034305
|
| 2022 |
MBOAT7 acts as a negative regulator of toll-like receptor (TLR) signaling in macrophages. MBOAT7 deficiency alters membrane phospholipid composition, redistributing arachidonic acid toward proinflammatory eicosanoids, inducing ER stress, mitochondrial dysfunction, and remodeling of the inflammatory-related chromatin landscape, culminating in enhanced macrophage TLR responses. Activation of MBOAT7 reverses these effects. |
MBOAT7 knockdown/activation in macrophages, phospholipidomics, eicosanoid profiling, ER stress markers, mitochondrial function assays, ATAC-seq chromatin accessibility profiling |
Nature communications |
Medium |
36473860
|
| 2024 |
Hepatocyte-specific (but not myeloid-specific) deletion of Mboat7 exacerbates ethanol-induced liver injury. Lipidomic profiling revealed increased endosomal/lysosomal lipids (bis-monoacylglycerophosphate, phosphatidylglycerols) in ethanol-exposed Mboat7-HSKO mice. Mechanistically, Mboat7 loss impairs TFEB-mediated lysosomal biogenesis and causes autophagosome accumulation, identifying lysosomal lipid homeostasis dysregulation as a key driver of alcohol-associated liver disease. |
Hepatocyte-specific and myeloid-specific Mboat7 conditional knockout mice, lipidomics, autophagic flux assays, TFEB localization/activity assays, liver injury markers |
eLife |
High |
38648183
|
| 2023 |
Adipocyte-specific genetic deletion of Mboat7 promotes hyperinsulinemia, systemic insulin resistance, and mild fatty liver. Unlike in the liver, MBOAT7 is the major source of arachidonic acid-containing PI pools in adipose tissue. Adipocyte MBOAT7-driven PI biosynthesis is closely linked to diet-induced hyperinsulinemia and insulin resistance. |
Adipocyte-specific Mboat7 knockout mice (adiponectin-Cre), hepatocyte-specific Mboat7 knockout mice (albumin-Cre), metabolic phenotyping, lipidomics of adipose tissue and liver |
Journal of lipid research |
High |
36806709
|
| 2024 |
MBOAT7 restoration in MASH mice lowers hepatocyte TAZ (WWTR1), and hepatocyte MBOAT7 silencing enhances TAZ upregulation. Changes in hepatocyte phospholipids due to MBOAT7 loss-of-function promote a cholesterol trafficking pathway that upregulates TAZ and the TAZ-induced profibrotic factor Indian hedgehog (IHH), establishing a novel MBOAT7→phospholipid→cholesterol trafficking→TAZ→IHH profibrotic axis. |
AAV-mediated MBOAT7 restoration in MASH mice, hepatocyte MBOAT7 silencing, TAZ/IHH expression analysis, cholesterol trafficking assays, human liver biopsy analysis |
Hepatology (Baltimore, Md.) |
Medium |
38776184
|
| 2025 |
Mboat7 deficiency impairs indirect neurogenesis in the developing neocortex by compromising radial glial cell (RGC) integrity, resulting in decreased proliferation, impaired differentiation into intermediate progenitor cells, and increased apoptosis. These defects were preceded by Golgi apparatus rounding and reduced apical E-cadherin expression. The Mboat7-deficient cortex displayed reduced PI(4,5)P2 levels, and pharmacological inhibition of PI(4,5)P2 synthesis recapitulated Golgi rounding, placing PI(4,5)P2 reduction downstream of MBOAT7 loss as the cause of RGC dysfunction. |
Mboat7 knockout mice, immunohistochemistry of RGC markers, PI(4,5)P2 measurement, pharmacological PI(4,5)P2 synthesis inhibition, Golgi morphology analysis, E-cadherin localization |
iScience |
Medium |
41488780
|
| 2025 |
Mboat7 loss in vivo results in massive accumulation of lysophosphatidylinositol (LPI) and hyperactive mTOR signaling. Inhibiting mTOR signaling with rapamycin rescued neuronal migration defects in Mboat7 knockout mice, establishing that MBOAT7-driven polyunsaturated PI synthesis suppresses mTOR activity to enable proper cortical neuronal migration. |
Mboat7 knockout mice, LC-MS/MS lipidomics of mouse brain and human neuron cultures during neurodevelopment, mTOR pathway activity assays, mTOR inhibitor (rapamycin) rescue of migration defects |
Science translational medicine |
High |
39742503
|
| 2025 |
Under physiological conditions, MBOAT7 interacts with CDS2 in the ER to maintain lipid metabolic homeostasis. Disruption of this interaction (CDS2 knockdown or loss of function) triggers an adaptive response in which MBOAT7 translocates from the ER to ER–lipid droplet (LD) contact sites in a RAB1-dependent manner. At ER-LD contacts, MBOAT7 inhibits DGAT2-mediated LD growth and promotes lipolysis. |
Co-immunoprecipitation (CDS2-MBOAT7 interaction), CDS2 knockdown, live-cell imaging of MBOAT7 subcellular relocalization, RAB1 dependence assay, DGAT2 activity and LD size assays, lipolysis measurements |
bioRxivpreprint |
Medium |
bio_10.1101_2025.08.26.672501
|
| 2020 |
Genetic deletion of MBOAT7 in clear cell renal cell carcinoma (ccRCC) cells decreases proliferation, induces cell cycle arrest, and prevents tumor formation in vivo. RNAseq of MBOAT7-knockout cells identified alterations in cell migration and extracellular matrix organization that were validated functionally in migration assays. MBOAT7 expression increases with tumor grade in human ccRCC samples. |
CRISPR/Cas9 knockout in ccRCC cell lines, proliferation assays, cell cycle analysis, in vivo xenograft assay, RNAseq, migration assays, shotgun lipidomics of human ccRCC tumors |
Molecular metabolism |
Medium |
32180553
|