{"id":1084,"date":"2026-03-09T06:25:04","date_gmt":"2026-03-09T06:25:04","guid":{"rendered":"http:\/\/elmoustkbal.com\/?p=1084"},"modified":"2026-03-09T06:25:04","modified_gmt":"2026-03-09T06:25:04","slug":"indicates-atase2","status":"publish","type":"post","link":"https:\/\/elmoustkbal.com\/?p=1084","title":{"rendered":"\ufeff< indicates ATase2"},"content":{"rendered":"

\ufeff< indicates ATase2.B,ATase2 was incubated with BACE1 in the presence of [3H]acetyl-CoA for 1 h at 30 C a sinFig. prevention of this form of SKF-82958 hydrobromide dementia. The efficiency of folding, conformational maturation, and molecular stability of nascent membrane and secretory proteins is greatly affected in the endoplasmic reticulum (ER)2by post-translational events that modify, either temporally or definitively, the protein (1). One of the best characterized forms of transient modification is the attachment of a glucose residue to improperly folded nascent glycoproteins by the UDP-glucose:glycoprotein glucosyltransferase (2,3). This transient event regulates the interaction of the nascent protein with the chaperone calnexin and its ability to leave the early secretory pathway. The mechanism works in such a way that successfully folded proteins dissociate from the calnexin\/calreticulin cycle and advance toward the Golgi apparatus, whereas misfolded intermediates are directed toward the ER-associated degradation system (1,4). We have recently reported the identification of a novel form of post-translational regulation of BACE1 (-site APP-cleaving enzyme 1) (5), a membrane protein that acts as the rate-limiting enzyme in the generation of the Alzheimer disease amyloid -peptide (A) from the amyloid precursor protein (APP). Specifically, nascent BACE1 is transiently acetylated in seven lysine residues clustered in a highly disordered region of the protein that faces the lumen of the ER and ER Golgi intermediate compartment (ERGIC). The lysine acetylation of nascent BACE1 regulates its ability to advance toward the Golgi apparatus, where a Golgi-based deacetylase removes the acetyl groups. Nonacetylated intermediates of the nascent protein are retained in the early secretory pathway and degraded by a mechanism that involves the serine protease PCSK9\/NARC-1 (proprotein convertase subtilisin kexin-type 9\/neural apoptosis-regulated convertase-1) (6). The acetylation of nascent BACE1 in the lumen of the ER and\/or ERGIC requires a membrane transporter that translocates acetyl-CoA, the donor of the acetyl group, from the cytoplasm to the lumen of the ER, and one or more ER\/ERGIC-based acetyl-CoA:lysine acetyltransferases (5). The acetylation\/deacetylation process is tightly regulated by the lipid second messenger ceramide (5,7,8) and is under the control of the general aging program mediated by the insulin-like growth factor 1 receptor (IGF-1R) (9,10). Ceramide, the last output of the above pathway, regulates both efficiency of acetylation in the lumen of the ER\/ERGIC and rate of deacetylation in the Golgi apparatus (5). As a result, the hyperactivation of ceramide signaling that occurs during normal aging (8) or in progeroid-like animal models (9) leads to increased acetylation and steady-state levels of BACE1 and to increased production of A (8,9). The relevance of the above events for AD neuropathology is stressed by the fact that aging is the single most important risk factor for late-onset AD and that AD patients have very high levels of ceramide in the brain, when compared with age-matched controls (reviewed in Ref.10). Here we report the identification of two ER\/ERGIC-based acetyltransferases, which we named ATase1 and Rabbit Polyclonal to CtBP1<\/a> ATase2. Both proteins display acetyl-CoA:lysine acetyltransferase activityin vitroand under native conditions can interact with and acetylate BACE1in vitroandin vivo, and show an ER\/ERGIC localization. They both regulate the steady-state levels of BACE1 and the generation of A, and are up-regulated by ceramide treatment of cultured cells. == EXPERIMENTAL PROCEDURES == The following experimental procedures, which have been extensively described in our previous work, are in the supplemental Methods: cell cultures and cell treatment; cell extraction, immunoprecipitation, and affinity purification; subcellular fractionation; A determination; and siRNA treatment. cDNA, Antibodies, and Western Blot AnalysisThe cDNA for ATase1 and ATase2 was obtained from Origene (catalog number SC311351 and catalog number SC108791, respectively). Western blotting was performed on a 4-12% BisTris SDS-PAGE system (NuPAGE; Invitrogen) as described (5,7-9,11,12). The following antibodies were used SKF-82958 hydrobromide in this study: anti-BACE1 N-terminal (monoclonal, R&D Systems); anti-BACE1 C-terminal (polyclonal, Abcam); anti-acetylated lysine (monoclonal, Abcam; polyclonal, Cell Signaling); anti-calreticulin (ER marker; polyclonal, Abcam); anti-ERGIC-53 (ERGIC marker; polyclonal, SKF-82958 hydrobromide<\/a> Sigma); anti-syntaxin (Golgi marker; monoclonal, Abcam); anti-EEA1 (endosomal marker; monoclonal, BD Transduction Laboratories); anti-Myc (polyclonal, Sigma); anti-C99 (monoclonal, MBL); flotillin 2 (polyclonal; Cell Signaling); and anti-actin (polyclonal, Cell Signaling). Secondary antibodies (Amersham Biosciences) were used at a 1:6000 dilution. Binding was detected by chemiluminescence (LumiGLO kit; Kirkegaard & Perry Laboratories, Gaithersburg, MD). In some cases, the bands corresponding to BACE1 were also validated with the BACE1-Cat1 antibody (generous gift from Dr. Robert Vassar (13)). Pixel densities (for signal area) of scanned images were calculated with Adobe Photoshop; densitometry (for signal-density) was analyzed with.<\/p>\n","protected":false},"excerpt":{"rendered":"

\ufeff< indicates ATase2.B,ATase2 was incubated with BACE1 in the presence of [3H]acetyl-CoA for 1 h at 30 C a sinFig. prevention of this form of…\n<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-1084","post","type-post","status-publish","format-standard","hentry","category-no-synthase-non-selective"],"yoast_head":"\n\ufeff< indicates ATase2 - DHFR inhibitors in non-small cell lung cancer<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/elmoustkbal.com\/?p=1084\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\ufeff< indicates ATase2 - DHFR inhibitors in non-small cell lung cancer\" \/>\n<meta property=\"og:description\" content=\"\ufeff< indicates ATase2.B,ATase2 was incubated with BACE1 in the presence of [3H]acetyl-CoA for 1 h at 30 C a sinFig. prevention of this form of…\" \/>\n<meta property=\"og:url\" content=\"https:\/\/elmoustkbal.com\/?p=1084\" \/>\n<meta property=\"og:site_name\" content=\"DHFR inhibitors in non-small cell lung cancer\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-09T06:25:04+00:00\" \/>\n<meta name=\"author\" content=\"webmaster\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"webmaster\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/elmoustkbal.com\\\/?p=1084#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/elmoustkbal.com\\\/?p=1084\"},\"author\":{\"name\":\"webmaster\",\"@id\":\"https:\\\/\\\/elmoustkbal.com\\\/#\\\/schema\\\/person\\\/6ba91697c07f5b1e48a1c50fec2fd4a0\"},\"headline\":\"\ufeff< indicates ATase2\",\"datePublished\":\"2026-03-09T06:25:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/elmoustkbal.com\\\/?p=1084\"},\"wordCount\":733,\"articleSection\":[\"NO Synthase, Non-Selective\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/elmoustkbal.com\\\/?p=1084\",\"url\":\"https:\\\/\\\/elmoustkbal.com\\\/?p=1084\",\"name\":\"\ufeff< indicates ATase2 - 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