stat3 specific antibody h 190 (Santa Cruz Biotechnology)
Structured Review
![(A, B) Gelshift experiments demonstrated that STAT1-T385A and wild-type protein exhibit a similar dissociation rate from a single STAT1-binding site (M67). Cell lysates from IFNγ-stimulated U3A cells (5 ng/ml) expressing either wild-type or mutant STAT1 were incubated with [ 33 P]-labeled M67 for 15 min and subsequently a 750-fold molar excess of unlabeled M67 was added for the durations indicated, before the reactions were loaded onto a native polyacrylamide gel. Shown is a typical gel, with the arrowhead at its right-hand margin corresponding to dimeric STAT1, including a densitometric quantification thereof. Asterisks mark unspecific bands. (C) The T385A mutant displays cooperative DNA binding due to tetramer stabilization. Extracts from an equal number of IFNγ-stimulated U3A cells expressing either wild-type or mutant STAT1 (5 µl in each lane) were incubated in vitro with [ 33 P]-labeled DNA containing two GAS sites separated by 10 bp (2xGAS). The reactions were either left unchallenged (−) or challenged for 30 min with a 750-fold excess of a single, unlabeled GAS site (+ Competition). Note that the tetrameric, but not the dimeric occupancy of the probe resisted competition with excess unlabeled DNA. (D) Gelshift experiments demonstrate the propensity of tetrameric STAT1-T385A to exchange dimers. Shown is a representative gel using [ 33 P]-labeled 2xGAS and cellular extracts from IFNγ/vanadate-co-stimulated U3A cells expressing either GFP-tagged or untagged STAT1. Supershifts with either <t>anti-STAT3</t> (lane 1 and 3) or anti-STAT1 (lane 2 and 4) antibodies identified bands corresponding to DNA-bound STAT1. For the identification of dimeric STAT1 complexes, a competition experiment using 750-molar excess of unlabelled GAS was included in the last lane. Similar amounts of GFP-tagged and untagged homodimers were either immediately mixed and incubated together for 45 min (lanes 6 and 8) or incubated separately for 45 min before being loaded together onto the gel (lanes 5 and 7). Note that newly formed bands corresponding to STAT-GFP/STAT1 heterotetramers appeared only in extracts that had been co-incubated. (E) The T385A mutant binds to GAS sequences as a tetramer. Whole cell extracts from reconstituted, IFNγ-prestimulated U3A cells were incubated with various [ 33 P]-labeled DNA probes containing either two (2xGAS), one (GAS-nonGAS) or no (2xnonGAS) GAS sites, respectively. In the first lane, a non-specific anti-STAT3 antibody and in the second lane, anti-STAT1 antibody C-24 was present in the EMSA reaction used for identification of STAT1-DNA complexes (marked with arrowheads). (F) The F172W and T385A mutants are defective in tyrosine dephosphorylation as revealed by an in vitro dephosphorylation assay using purified Tc45 phosphatase. Cell extracts from reconstituted U3A cells expressing either wild-type or mutant STAT1 (10 µl in each reaction) were incubated with 2 U of the STAT1-specific Tc45 phosphatase and tyrosine dephosphorylation was monitored with time by means of Western blotting.](https://pub-med-central-images-cdn.bioz.com/pub_med_central_ids_ending_with_4676/pmc03724676/pmc03724676__pone.0069903.g003.jpg)
Stat3 Specific Antibody H 190, supplied by Santa Cruz Biotechnology, used in various techniques. Bioz Stars score: 96/100, based on 4569 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
https://www.bioz.com/result/stat3 specific antibody h 190/product/Santa Cruz Biotechnology
Average 96 stars, based on 4569 article reviews
Images
1) Product Images from "Clinically Relevant Dimer Interface Mutants of STAT1 Transcription Factor Exhibit Differential Gene Expression"
Article Title: Clinically Relevant Dimer Interface Mutants of STAT1 Transcription Factor Exhibit Differential Gene Expression
Journal: PLoS ONE
doi: 10.1371/journal.pone.0069903
Figure Legend Snippet: (A, B) Gelshift experiments demonstrated that STAT1-T385A and wild-type protein exhibit a similar dissociation rate from a single STAT1-binding site (M67). Cell lysates from IFNγ-stimulated U3A cells (5 ng/ml) expressing either wild-type or mutant STAT1 were incubated with [ 33 P]-labeled M67 for 15 min and subsequently a 750-fold molar excess of unlabeled M67 was added for the durations indicated, before the reactions were loaded onto a native polyacrylamide gel. Shown is a typical gel, with the arrowhead at its right-hand margin corresponding to dimeric STAT1, including a densitometric quantification thereof. Asterisks mark unspecific bands. (C) The T385A mutant displays cooperative DNA binding due to tetramer stabilization. Extracts from an equal number of IFNγ-stimulated U3A cells expressing either wild-type or mutant STAT1 (5 µl in each lane) were incubated in vitro with [ 33 P]-labeled DNA containing two GAS sites separated by 10 bp (2xGAS). The reactions were either left unchallenged (−) or challenged for 30 min with a 750-fold excess of a single, unlabeled GAS site (+ Competition). Note that the tetrameric, but not the dimeric occupancy of the probe resisted competition with excess unlabeled DNA. (D) Gelshift experiments demonstrate the propensity of tetrameric STAT1-T385A to exchange dimers. Shown is a representative gel using [ 33 P]-labeled 2xGAS and cellular extracts from IFNγ/vanadate-co-stimulated U3A cells expressing either GFP-tagged or untagged STAT1. Supershifts with either anti-STAT3 (lane 1 and 3) or anti-STAT1 (lane 2 and 4) antibodies identified bands corresponding to DNA-bound STAT1. For the identification of dimeric STAT1 complexes, a competition experiment using 750-molar excess of unlabelled GAS was included in the last lane. Similar amounts of GFP-tagged and untagged homodimers were either immediately mixed and incubated together for 45 min (lanes 6 and 8) or incubated separately for 45 min before being loaded together onto the gel (lanes 5 and 7). Note that newly formed bands corresponding to STAT-GFP/STAT1 heterotetramers appeared only in extracts that had been co-incubated. (E) The T385A mutant binds to GAS sequences as a tetramer. Whole cell extracts from reconstituted, IFNγ-prestimulated U3A cells were incubated with various [ 33 P]-labeled DNA probes containing either two (2xGAS), one (GAS-nonGAS) or no (2xnonGAS) GAS sites, respectively. In the first lane, a non-specific anti-STAT3 antibody and in the second lane, anti-STAT1 antibody C-24 was present in the EMSA reaction used for identification of STAT1-DNA complexes (marked with arrowheads). (F) The F172W and T385A mutants are defective in tyrosine dephosphorylation as revealed by an in vitro dephosphorylation assay using purified Tc45 phosphatase. Cell extracts from reconstituted U3A cells expressing either wild-type or mutant STAT1 (10 µl in each reaction) were incubated with 2 U of the STAT1-specific Tc45 phosphatase and tyrosine dephosphorylation was monitored with time by means of Western blotting.
Techniques Used: Binding Assay, Expressing, Mutagenesis, Incubation, Labeling, In Vitro, De-Phosphorylation Assay, Purification, Western Blot


