{"doi":"10.1016/j.molcel.2023.01.024","title":"Structural snapshots of R-loop formation by a type I-C CRISPR Cascade","abstract":"Type I CRISPR-Cas systems employ multi-subunit Cascade effector complexes to target foreign nucleic acids for destruction. Here, we present structures of D. vulgaris type I-C Cascade at various stages of double-stranded (ds)DNA target capture, revealing mechanisms that underpin PAM recognition and Cascade allosteric activation. We uncover an interesting mechanism of non-target strand (NTS) DNA stabilization via stacking interactions with the \"belly\" subunits, securing the NTS in place. This \"molecular seatbelt\" mechanism facilitates efficient R-loop formation and prevents dsDNA reannealing. Additionally, we provide structural insights into how two anti-CRISPR (Acr) proteins utilize distinct strategies to achieve a shared mechanism of type I-C Cascade inhibition by blocking PAM scanning. These observations form a structural basis for directional R-loop formation and reveal how different Acr proteins have converged upon common molecular mechanisms to efficiently shut down CRISPR immunity.","journal":"Molecular Cell","year":2023,"id":342289,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":14,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9492,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2023-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":463337,"name":"Jack P. K. Bravo","orcid":"0000-0003-0456-0753","position":1,"is_corresponding":false},{"id":989111,"name":"Delisa Ramos","orcid":"0009-0001-4294-0258","position":2,"is_corresponding":false},{"id":477803,"name":"Grace N. Hibshman","orcid":"0000-0002-3470-4861","position":3,"is_corresponding":false},{"id":989112,"name":"Jacquelyn T. Wright","orcid":"0000-0001-8428-1863","position":4,"is_corresponding":false},{"id":377366,"name":"David W. Taylor","orcid":"0000-0002-6198-1194","position":5,"is_corresponding":false},{"id":463336,"name":"Roisin E. O’Brien","orcid":"0000-0003-0251-9693","position":0,"is_corresponding":true}],"reference_count":52,"raw_metadata":null,"created_at":"2026-07-19T01:11:12.506815Z","pmid":"36805026","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":[]}