Journal: Stem Cell Reports

Article Title: CITED2 Cooperates with ISL1 and Promotes Cardiac Differentiation of Mouse Embryonic Stem Cells

doi: 10.1016/j.stemcr.2016.10.002

Figure Lengend Snippet: Loss of Cited2 Impairs Expression of Genes Specifying Cardiac Mesoderm (A) Percentage of colonies with beating foci derived from C2 fl/fl and C2 Δ/Δ [LA11] ESC at D8 and D10 of differentiation. (B) Percentage of colonies with beating foci counted at 8 and 10 days after the initiation of differentiation in cell cultures derived from C2 fl/fl [Cre] ESC treated with ethanol or 4HT at D0 of differentiation, and with 4HT at D0 of differentiation and supplemented with recombinant 8R-CITED2 protein at D2 of differentiation (4HT + 8R-CITED2). (C) Expression of Activin A and Nodal determined by qPCR at D2 and D3 of differentiation in cultures derived from C2 fl/fl [Cre] ESC treated with 4HT or ethanol at D0 for 48 hr. (D) Expression of mesoderm markers ( Brachyury and Mesp1 ) at D2, D3, D5, and D12 of differentiation in cells generated from C2 fl/fl [Cre] ESC treated as described in ( B). (E) Expression of Isl1 , Gata4 , Nkx2.5 , and Tbx5 in cell cultures as described in (D). The inserts for Isl1 and Tbx5 detail the expression of these genes at D5 and D3, respectively. (F) Relative expression of Brachyury , Mesp1 , Isl1 , Gata4 , Nkx2.5 , and Tbx5 determined by qPCR at D5 of differentiation in cultures derived from untreated C2 fl/fl and C2 Δ/Δ [LA11] ESC, and C2 Δ/Δ [LA11] ESC supplemented with the recombinant 8R-CITED2 protein (C2 Δ/Δ [LA11] + 8R-CITED2) at D2 of differentiation for 48 hr. Gene expression in C2 fl/fl ESC was set to 1. (G) Enrichment of Isl1 genomic regions in extracts of E14/T ESC-derived cells at D5 by ChIP assays with anti-CITED2 or control (immunoglobulin G) polyclonal antibodies. Results are presented as the mean ± SEM of three independent biological experiments.

Article Snippet: Full-length human CITED2 cDNA and an oligonucleotide encoding eight arginines (8R) were cloned into the pGEX6P1 vector (GE Healthcare Life Sciences) to express a chimeric protein consisting of the GST in fusion with the 8R domain and CITED2 (termed GST-8R-CITED2, ).

Techniques: Expressing, Derivative Assay, Recombinant, Generated, Gene Expression, Control

Journal: Proteins

Article Title: Probing Enzymatic Acetylation Events in Real Time With NMR Spectroscopy: Insights Into Acyl-Cofactor Dependent p300 Modification of Histone H4.

doi: 10.1002/prot.26848

Figure Lengend Snippet: FIGURE 1 | Generation of a p300 construct with improved yield. (A) Representative expression and purification gel of p300 KAT from pETdu- et+p300 KAT suggests a total yield of ~1 mg/L of media. Lanes show (1) Whole cell lysate (2) Insoluble pellet (3) Soluble supernatant (4) NiNTA flowthrough (5) Low salt (150 mM) wash (6) High salt (1 M) wash (7) NiNTA elution alongside the protein standard ladder lane (L) (ThermoFischer 26 634). p300 KAT is the faint band ~50 kDa in lane 7. (B) Schematic representation of the histone H4 (1-25)W construct used in subsequent experi- ments. This construct can be uniformly acetylated by p300 KAT on each of its five available lysine sites. (C) Demonstration of variable activity be- tween p300 KAT preparations shown by MALDI-MS spectra of identical acetylation reactions using presumably equivalent enzyme preparations. (D) Representative expression and purification gel for p300 KAT from pET His6 MBP TEV p300(1284–1669) LIC (Addgene #233587). Total yield was typ- ically > 10 mg/L of media. Lanes show (1) Whole cell lysate (2) Insoluble pellet (3) Soluble supernatant (4) NiNTA flowthrough 1 (5) Low salt (150 mM) wash (6) High salt (1 M) wash (7) NiNTA elution 1 (8) TEV protease dialysate (9) NiNTA flowthrough 2 (10) NiNTA wash 2 (11) NiNTA elution 2 (12) Protein ladder (NEB P7719S). Cleaved p300 KAT is the band ~43 kDa in lanes 9 and 10 (expected molecular weight once cleaved is 44 684 Da). Note this is very close to the expected molecular weight of 41 584 Da for the cleaved MBP solubility tag.

Article Snippet: p300 KAT was originally obtained from pETduet+p300 KAT, a gift from Michael Rosen (Addgene #157793), which coexpresses human p300 (1284–1664) with yeast Sirt2 [22].

Techniques: Construct, Expressing, Purification, Activity Assay, Molecular Weight, Solubility

Journal: Proteins

Article Title: Probing Enzymatic Acetylation Events in Real Time With NMR Spectroscopy: Insights Into Acyl-Cofactor Dependent p300 Modification of Histone H4.

doi: 10.1002/prot.26848

Figure Lengend Snippet: FIGURE 2 | Pre-acetylation of p300 does not meaningfully alter acetyltransferase activity. (A) Overlaid 13C, 1H-HSQC NMR spectra showing re- action products after 1 h treatment of histone H4 (1-25)W with native p300 (teal) or p300 prescribed to a 2-h incubation with acetyl-CoA (purple). (B) overlaid 1D projections of the 13C, 1H-HSQC experiments demonstrate nearly equivalent peak heights for the acetyl-CoA (2.25 ppm) and acetyllysine (1.87 ppm 1H) products. (C) MALDI-MS spectra showing the distributions of reaction products.

Article Snippet: p300 KAT was originally obtained from pETduet+p300 KAT, a gift from Michael Rosen (Addgene #157793), which coexpresses human p300 (1284–1664) with yeast Sirt2 [22].

Techniques: Activity Assay, Incubation

Journal: Proteins

Article Title: Probing Enzymatic Acetylation Events in Real Time With NMR Spectroscopy: Insights Into Acyl-Cofactor Dependent p300 Modification of Histone H4.

doi: 10.1002/prot.26848

Figure Lengend Snippet: FIGURE 3 | Comparison of p300 and p300Δ acetyltransferase activity towards the histone H4 tail. (A) Circular dichroism spectra for p300 (teal) and p300Δ (pink) used to estimate secondary structure content with BestSel. (B) MALDI-MS time courses comparing relative acetyltransferase ef- ficiency of p300 (teal) and p300Δ (pink) using the histone H4 tail as a substrate. (C) Mono-exponential fit of acetyltransferase reaction curves from a 1H-13C, HSQC based NMR time course for p300 (teal) and p300Δ (pink) acetyltransferase reactions with the histone H4 tail. Progress curves show the increase in intensity for the acetyllysine resonance centered at 1.86 ppm 1H, 22.1 ppm 13C over time, each data point represents the maximum acetyllysine peak intensity from a 3 min and 36 s experiment. Progress curves were fit with a mono-exponential kinetic model to estimate relative turnover rates (k) and maximum intensity (Imax). (D) Progress curves for p300 (teal) and p300Δ (pink) acetyltransferase reactions with the histone H4 tail fit with a bi-exponential kinetic model to estimate relative turnover rates (k1 and k2) and relative contributions to the maximum intensity (A1 and A2). R2 values are included in C and D to indicate the goodness of fit, and fit residuals for each data point are displayed at scale relative to 20% of the maximum data intensity.

Article Snippet: p300 KAT was originally obtained from pETduet+p300 KAT, a gift from Michael Rosen (Addgene #157793), which coexpresses human p300 (1284–1664) with yeast Sirt2 [22].

Techniques: Comparison, Activity Assay, Circular Dichroism

Journal: Proteins

Article Title: Probing Enzymatic Acetylation Events in Real Time With NMR Spectroscopy: Insights Into Acyl-Cofactor Dependent p300 Modification of Histone H4.

doi: 10.1002/prot.26848

Figure Lengend Snippet: FIGURE 4 | Validation of 12C propionyl-CoA synthesis and con- trol reactions to enable 13C propionylation resonance assignments. (A) Proton 1D NMR spectra showing the reaction product of the propionyl- CoA (green) synthesis reaction from propionic anhydride precursor (gray). The peaks at 1.06 and 2.56 ppm, respectively, were assigned to the methyl and methylene protons of the CoA conjugated propionyl moiety based on comparison to reference proton 1D spectra provided by CoALA Biosciences (SKU PC01). (B) Overlaid 13C, 1H-HSQC NMR spectra of the propionyltransferase reaction mixture (without enzyme) before adding 13C propionyl-CoA (gray) and after adding 13C propionyl- CoA (green). (C) Overlaid 13C, 1H-HSQC NMR spectra for p300 cata- lyzed propionylation of the histone H4 tail (green) overlaid with the ap- propriate no enzyme control (gray).

Article Snippet: p300 KAT was originally obtained from pETduet+p300 KAT, a gift from Michael Rosen (Addgene #157793), which coexpresses human p300 (1284–1664) with yeast Sirt2 [22].

Techniques: Biomarker Discovery, Comparison, Control

Journal: Proteins

Article Title: Probing Enzymatic Acetylation Events in Real Time With NMR Spectroscopy: Insights Into Acyl-Cofactor Dependent p300 Modification of Histone H4.

doi: 10.1002/prot.26848

Figure Lengend Snippet: FIGURE 5 | Comparison of p300 and p300Δ propionyltransferase activity towards the histone H4 tail. (A) MALDI-MS time course com- paring relative propionyltransferase efficiency of p300 (teal) and p300Δ (pink) using the histone H4 tail as a substrate. (B) Progress curves for p300 (teal) and p300Δ (pink) propionyltransferase reactions with the histone H4 tail fit with a mono-exponential kinetic model to estimate relative turnover rates (k) and maximum intensity (Imax). (C) Progress curves for p300 (teal) and p300Δ (pink) propionyltransferase reactions with the histone H4 tail fit with a lagged mono-exponential kinetic model to estimate relative turnover rate (k1), amplitude (A), lag time (t0), and slope around t0 (α). R2 values are included in B and C to indicate the goodness of fit, and fit residuals for each data point are displayed at scale relative to 20% of the maximum data intensity.

Article Snippet: p300 KAT was originally obtained from pETduet+p300 KAT, a gift from Michael Rosen (Addgene #157793), which coexpresses human p300 (1284–1664) with yeast Sirt2 [22].

Techniques: Comparison, Activity Assay