{"doi":"10.1126/sciadv.adg0251","title":"Helical allophycocyanin nanotubes absorb far-red light in a thermophilic cyanobacterium","abstract":"To compete in certain low-light environments, some cyanobacteria express a paralog of the light-harvesting phycobiliprotein, allophycocyanin (AP), that strongly absorbs far-red light (FRL). Using cryo-electron microscopy and time-resolved absorption spectroscopy, we reveal the structure-function relationship of this FRL-absorbing AP complex (FRL-AP) that is expressed during acclimation to low light and that likely associates with chlorophyll a-containing photosystem I. FRL-AP assembles as helical nanotubes rather than typical toroids due to alterations of the domain geometry within each subunit. Spectroscopic characterization suggests that FRL-AP nanotubes are somewhat inefficient antenna; however, the enhanced ability to harvest FRL when visible light is severely attenuated represents a beneficial trade-off. The results expand the known diversity of light-harvesting proteins in nature and exemplify how biological plasticity is achieved by balancing resource accessibility with efficiency.","journal":"Science Advances","year":2023,"id":324248,"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":34,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9607,"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":1040193,"name":"Eduard Elias","orcid":"0000-0002-2048-5629","position":1,"is_corresponding":false},{"id":643039,"name":"Gaozhong Shen","orcid":"0000-0003-2801-591X","position":2,"is_corresponding":false},{"id":1040194,"name":"Nathan T. Soulier","orcid":"0000-0001-7257-8846","position":3,"is_corresponding":false},{"id":634422,"name":"David A. Flesher","orcid":"0000-0002-8270-4751","position":4,"is_corresponding":false},{"id":482709,"name":"M. R. Gunner","orcid":"0000-0003-1120-5776","position":5,"is_corresponding":false},{"id":634426,"name":"Gary W. Brudvig","orcid":"0000-0002-7040-1892","position":6,"is_corresponding":false},{"id":1040195,"name":"Roberta Croce","orcid":"0000-0003-3469-834X","position":7,"is_corresponding":false},{"id":643044,"name":"Donald A. Bryant","orcid":"0000-0003-2782-5988","position":8,"is_corresponding":false},{"id":634421,"name":"Christopher J. Gisriel","orcid":"0000-0002-8011-0052","position":0,"is_corresponding":true}],"reference_count":51,"raw_metadata":null,"created_at":"2026-07-19T01:08:11.275604Z","pmid":"36961897","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":[]}