{"doi":"10.18388/abp.2008_3078","title":"Properties of Escherichia coli RNA polymerase from a strain devoid of the stringent response alarmone ppGpp.","abstract":"<jats:p>The stringent response alarmone guanosine tetraphosphate (ppGpp) affects transcription from many promoters. ppGpp binds directly to the transcription enzyme of Escherichia coli, RNA polymerase. Analysis of the crystal structure of RNA polymerase with ppGpp suggested that binding of this nucleotide may result in some conformational or post-translational alterations to the enzyme. These changes might affect in vitro performance of the enzyme. Here, a comparison of the in vitro properties of RNA polymerases isolated from wild type and ppGpp-deficient bacteria shows that both enzymes do not differ in i) transcription activity of various promoters (e.g. sigma(70)-rrnB P1, lambdapL, T7A1), ii) response to ppGpp, iii) promoter-RNA polymerase open complex stability. Thus, it may be concluded that ppGpp present in the bacterial cell prior to purification of the RNA polymerase does not result in the alterations to the enzyme that could be permanent and affect its in vitro transcription capacity.</jats:p>","journal":"Acta Biochimica Polonica","year":2008,"id":608185,"datarank":0.20794415416798362,"base_score":1.3862943611198906,"endowment":1.3862943611198906,"self_citation_contribution":0.20794415416798362,"citation_network_contribution":0.0,"self_endowment_contribution":0.20794415416798362,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":3,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":null,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":311318,"name":"Agnieszka Szalewska-Pałasz","orcid":"0000-0001-8013-4057","position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"resolved":true,"title":"Properties of Escherichia coli RNA polymerase from a strain devoid of the stringent response alarmone ppGpp.","abstract":"<jats:p>The stringent response alarmone guanosine tetraphosphate (ppGpp) affects transcription from many promoters. ppGpp binds directly to the transcription enzyme of Escherichia coli, RNA polymerase. Analysis of the crystal structure of RNA polymerase with ppGpp suggested that binding of this nucleotide may result in some conformational or post-translational alterations to the enzyme. These changes might affect in vitro performance of the enzyme. Here, a comparison of the in vitro properties of RNA polymerases isolated from wild type and ppGpp-deficient bacteria shows that both enzymes do not differ in i) transcription activity of various promoters (e.g. sigma(70)-rrnB P1, lambdapL, T7A1), ii) response to ppGpp, iii) promoter-RNA polymerase open complex stability. Thus, it may be concluded that ppGpp present in the bacterial cell prior to purification of the RNA polymerase does not result in the alterations to the enzyme that could be permanent and affect its in vitro transcription capacity.</jats:p>","is_dataset_classified":null,"base_score":1.3862943611198906,"endowment":1.3862943611198906,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"42513814","pmcid":null,"openalex_id":"https://openalex.org/W2027761157","authors":[],"funders":[],"total_grants":0,"fwci":0.5772,"citation_percentile":0.72200549,"influential_citations":0,"citation_trend":[],"oa_status":"gold","license":"cc-by","oa_locations":[{"url":"https://ojs.ptbioch.edu.pl/index.php/abp/article/download/3078/2139","host_type":"journal"},{"url":"https://ojs.ptbioch.edu.pl/index.php/abp/article/download/3078/2139","host_type":"publisher"},{"url":"https://doi.org/10.18388/abp.2008_3078","host_type":"journal"},{"url":"https://pubmed.ncbi.nlm.nih.gov/18560603","host_type":"repository"}],"fields_of_study":["Bacterial Genetics and Biotechnology","RNA and protein synthesis mechanisms","Enzyme Structure and Function"],"mesh_terms":["DNA, Bacterial","Enzyme Stability","Escherichia coli","Guanosine Tetraphosphate","Mutation","Plasmids","Promoter Regions, Genetic","DNA-Directed RNA Polymerases","Transcription, Genetic"],"keywords":["Stringent response","RNA polymerase","Transcription (linguistics)","Polymerase","Molecular biology","Guanosine","RNA-dependent RNA polymerase","Biology","RNA polymerase II","RNA","Escherichia coli","Biochemistry","Chemistry","Enzyme","Promoter","Gene expression","Gene","concrete","dynamic damage","mesoscopic model","penetration","rigid elasticity"],"sdg_mappings":[],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-07-30T07:39:13.685274Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}