{"doi":"10.1073/pnas.78.3.1700","title":"Accumulation of protoporphyrin IX and Zn protoporphyrin IX in\n                    <i>Cyanidium caldarium</i>","abstract":"<jats:p>\n                    <jats:italic>In vivo</jats:italic>\n                    fluorescence studies of\n                    <jats:italic>Cyanidium caldarium</jats:italic>\n                    mutants grown in the dark in dextrose-containing media have shown that these organisms accumulate protoporphyrin IX. In the dark the accumulated protoporphyrin IX is gradually turned into a metalloporphyrin, Zn protoporphyrin. In the light, in the chlorophyll-lacking mutant GGB, both compounds are degraded and phycobiliproteins are formed. These results implicate protoporphyrin IX\n                    <jats:italic>in situ</jats:italic>\n                    as the general precursor to tetrapyrrole pigments and Zn protoporphyrin IX as a possible intermediate or regulator in the biosynthesis of phycobilins.\n                  </jats:p>","journal":"Proceedings of the National Academy of Sciences","year":1981,"id":656397,"datarank":0.3453877639491069,"base_score":2.302585092994046,"endowment":2.302585092994046,"self_citation_contribution":0.3453877639491069,"citation_network_contribution":0.0,"self_endowment_contribution":0.3453877639491069,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":9,"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":1713477,"name":"R. MacColl","orcid":null,"position":1,"is_corresponding":false},{"id":1713478,"name":"D. S. Berns","orcid":null,"position":2,"is_corresponding":false},{"id":1713476,"name":"K. Csatorday","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"resolved":true,"title":"Accumulation of protoporphyrin IX and Zn protoporphyrin IX in\n                    <i>Cyanidium caldarium</i>","abstract":"<jats:p>\n                    <jats:italic>In vivo</jats:italic>\n                    fluorescence studies of\n                    <jats:italic>Cyanidium caldarium</jats:italic>\n                    mutants grown in the dark in dextrose-containing media have shown that these organisms accumulate protoporphyrin IX. In the dark the accumulated protoporphyrin IX is gradually turned into a metalloporphyrin, Zn protoporphyrin. In the light, in the chlorophyll-lacking mutant GGB, both compounds are degraded and phycobiliproteins are formed. These results implicate protoporphyrin IX\n                    <jats:italic>in situ</jats:italic>\n                    as the general precursor to tetrapyrrole pigments and Zn protoporphyrin IX as a possible intermediate or regulator in the biosynthesis of phycobilins.\n                  </jats:p>","is_dataset_classified":null,"base_score":2.302585092994046,"endowment":2.302585092994046,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"16592992","pmcid":"PMC319200","openalex_id":"https://openalex.org/W2003982711","authors":[],"funders":[],"total_grants":0,"fwci":0.381,"citation_percentile":0.54867448,"influential_citations":0,"citation_trend":[{"year":2016,"count":1},{"year":2018,"count":1},{"year":2019,"count":1}],"oa_status":"green","license":null,"oa_locations":[{"url":"https://www.ncbi.nlm.nih.gov/pmc/articles/319200","host_type":"repository"},{"url":"https://www.ncbi.nlm.nih.gov/pmc/articles/319200","host_type":"repository"},{"url":"https://pnas.org/doi/pdf/10.1073/pnas.78.3.1700","host_type":"publisher"},{"url":"https://doi.org/10.1073/pnas.78.3.1700","host_type":"journal"},{"url":"https://pubmed.ncbi.nlm.nih.gov/16592992","host_type":"repository"}],"fields_of_study":["Porphyrin Metabolism and Disorders","Heme Oxygenase-1 and Carbon Monoxide","Photosynthetic Processes and Mechanisms"],"mesh_terms":[],"keywords":["Protoporphyrin IX","Tetrapyrrole","Protoporphyrin","Phycobiliprotein","Chemistry","Biochemistry","Protochlorophyllide","Mutant","Biosynthesis","Porphyrin","Biology","Cyanobacteria","Enzyme","Photodynamic therapy","Bacteria","Gene","Organic chemistry"],"sdg_mappings":[],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-08-11T20:44:02.628555Z","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":[]}