However, function in the Weintraub lab shows that deamidated Bcl-xL binds Bim [13] still, casting question over the model that Bcl-xL deamidation activates apoptosis thereby. of higher bands compared to the full total (higher plus lower rings) had been computed. The mean beliefs SD from five impartial experiments are shown in the histogram (reddish collection). (976 KB TIF) pbio.0050001.sg001.tif SC 66 (976K) GUID:?F27A76A5-801D-4F29-8D73-4B5DF4003F72 Physique S2: Deamidation Disrupts the Sequestration of BH3-Only Proteins by Bcl-xL (A) Puma binds to the native but not SC 66 deamidated form of Bcl-xL. Either wild-type (1.5 107, lanes 3 and 4) or pretumourigenic thymocytes (1.5 107, lanes 5 and 6) were treated as in Figure 2A, and cells were lysed and subjected to immunoprecipitation with Puma antibody, followed by blotting with either Bcl-xL or Puma antibodies. Lane 1 is usually a wild-type thymocyte whole cell lysates (WCLs) control to facilitate comparison of native and deamidated forms of Bcl-xL. The asterisk indicates the light chain of the Puma antibody utilized for immunoprecipitation.(B) Deamidated Bcl-xL from alkali treated thymocytes no longer binds to Bim. Wild-type thymocytes were incubated in neutral (pH 7.0) or alkaline (pH 9.0) buffer at 37 C for 24 h. Bim was immunoprecipitated from WCLs and WCL samples. Bim immunoprecipitates and Bim-depleted lysates were then separated and immunoblotted for either Bcl-xL or Bim. (944 KB TIF) pbio.0050001.sg002.tif (945K) GUID:?6AE94093-BDF4-4402-B6E1-E618B4660BC0 Figure S3: The Asp and iso-Asp Forms of Bcl-xL Chymotryptic Peptides SC 66 1 and 2 Were Identified by Spiking an Aliquot of a Digestion Combination with Asp- or iso-AspCContaining Synthetic Peptides Before LC-MS Peptides SDVEENRTEAPEGTESEMETPSAINGNPSW (peptide 1) and HLADSPAVNGATGHSSSL (peptide 2) and the corresponding deamidated forms, which contain the putative deamidation sites N52 and N66, respectively, were generated by digestion of rBcl-xL with chymotrypsin. The chromatographic conditions utilized for the separation of the peptides in the LC-MS analyses were optimised so as to handle the Asn, Asp, and iso-Asp forms of peptides 1 and 2. The Asp and iso-Asp forms of the two peptides were recognized by spiking an aliquot of a digestion combination with Asp- or iso-AspCcontaining synthetic peptides prior to LC-MS as shown. The chromatograms show LC-MS analyses at time point 72 h of the rBcl-xL base treatment.(1.1 MB TIF) pbio.0050001.sg003.tif (1.1M) GUID:?9831BD4F-18F0-4DE9-8CEC-800B235DFA75 Figure S4: DNA DamageCInduced NHE-1 Up-Regulation Is Mitochondrial ApoptosisCIndependent (A) Aliquots of the cells from Figure 1A incubated in the presence or absence of Z-VAD-fmk (200 M) were analysed for the expression of NHE-1 and tubulin (as loading control) by immunoblotting.(B) Aliquots of the cells from Physique 1C were analysed for the expression of NHE-1 by immunoblotting. Tubulin was reprobed as loading control. (645 KB TIF) pbio.0050001.sg004.tif (646K) GUID:?8FDB69DB-811F-4716-B6AF-D26B6962B5B9 Figure S5: Thymocytes Treated with DMA or Transduced with NHE-1 siRNA Display a Survival Advantage In Vitro Following DNA Damage (A) Purified double-negative (DN) thymocytes treated with/without DMA, etoposide, or irradiation were cultured in vitro. At 24 h, 48 h, or 72 h, an aliquot of cells was analysed by PI staining (0.5 g/ml) using circulation cytometry; PI-positive cells represent lifeless cells.(B) Purified DN thymocytes transduced with NHE-1 shRNA2 or vacant vector were treated with or without etoposide and irradiation and then VEZF1 cultured in vitro. At 24 h, 48 h, or 72 h, an aliquot of cells was analysed as in (A). (431 KB TIF) pbio.0050001.sg005.tif (432K) GUID:?ED1A738E-657A-4E28-8F82-B802843C4708 Figure S6: Supplementary Information for NHE-1 Knockdown and Phosphorylation Analysis. (A) Knockdown of NHE-1 by shRNA. NHE-1 shRNA (shRNA1C5), unfavorable control, and vacant vector were transduced into wild-type thymocytes. Immunoblotting for NHE-1 SC 66 and tubulin showed that shRNA2 is the most potent shRNA2 inhibiting NHE-1 expression; soshRNA2 was used in subsequent experiments.(B) The histograms summarise the percentage of apoptotic cells (Annexin V+PI?) and lifeless cells (Annexin V+PI+) from your experiment illustrated in Physique 5C. The data are means based on five impartial experiments. (C) The Ser phosphorylation of the NHE-1 antiport remains unchanged following DNA damage. Wild-type or thymocytes were exposed to 5 Gy of irradiation and managed in culture for the times.