{"doi":"10.1006/bbrc.1995.1042","title":"Point Mutation in the Second Phosphatase Domain of CD45 Abrogates Tyrosine Phosphatase Activity","abstract":null,"journal":"Biochemical and Biophysical Research Communications","year":1995,"id":664035,"datarank":1.1567022423724937,"base_score":3.1354942159291497,"endowment":3.1354942159291497,"self_citation_contribution":0.47032413238937254,"citation_network_contribution":0.6863781099831212,"self_endowment_contribution":0.47032413238937254,"citer_contribution":0.6863781099831212,"corpus_percentile":null,"corpus_rank":null,"citation_count":22,"citer_count":14,"citers_with_citation_signal":14,"citers_with_endowment":14,"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":1733837,"name":"A. Maiti","orcid":null,"position":1,"is_corresponding":false},{"id":264652,"name":"P. Johnson","orcid":"0000-0001-6663-7520","position":2,"is_corresponding":false},{"id":1733836,"name":"D.H.W. Ng","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"resolved":true,"title":"Point Mutation in the Second Phosphatase Domain of CD45 Abrogates Tyrosine Phosphatase Activity","abstract":"CD45 is a transmembrane protein tyrosine phosphatase that possesses two phosphatase domains in its cytoplasmic region. Whether both domains function independently as phosphatase enzymes or whether both domains interact to form an active enzyme is unclear. A point mutation of a critical cysteine residue in domain I is known to abolish CD45 activity, implying that the catalytic activity resides in domain I. In this report, mutational analysis of purified, recombinant CD45 cytoplasmic domain protein was performed. It was found that a single amino acid change in domain II (glutamine 1180 to a glycine) resulted in an inactive phosphatase enzyme, whereas two other point mutations in the membrane proximal region of the molecule had no effect on activity. Deletion of the region linking the two phosphatase domains also abolished enzymatic activity. Amino acids crucial for phosphatase activity thus reside in both phosphatase domains of CD45, illustrating that the phosphatase domains of CD45 do not act independently, but are both required for the phosphatase activity of CD45.","is_dataset_classified":null,"base_score":3.1354942159291497,"endowment":3.1354942159291497,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"7818534","pmcid":null,"openalex_id":"https://openalex.org/W2080899088","authors":[],"funders":[],"total_grants":0,"fwci":1.5627,"citation_percentile":0.83728915,"influential_citations":0,"citation_trend":[{"year":2023,"count":1}],"oa_status":"closed","license":"https://www.elsevier.com/tdm/userlicense/1.0/","oa_locations":[{"url":"https://api.elsevier.com/content/article/PII:S0006291X8571042X?httpAccept=text/xml","host_type":"publisher"},{"url":"https://api.elsevier.com/content/article/PII:S0006291X8571042X?httpAccept=text/plain","host_type":"publisher"},{"url":"https://doi.org/10.1006/bbrc.1995.1042","host_type":"journal"},{"url":"https://pubmed.ncbi.nlm.nih.gov/7818534","host_type":"repository"}],"fields_of_study":["Protein Tyrosine Phosphatases","Glycosylation and Glycoproteins Research","Protein Kinase Regulation and GTPase Signaling","Amino Acid Sequence","Animals","Base Sequence","Chromatography, Ion Exchange","Cloning, Molecular","Conserved Sequence","Electrophoresis, Polyacrylamide Gel","Escherichia coli","Kinetics","Leukocyte Common Antigens","Mice","Molecular Sequence Data","Mutagenesis, Site-Directed","Oligodeoxyribonucleotides","Point Mutation","Recombinant Proteins"],"mesh_terms":["Amino Acid Sequence","Animals","Base Sequence","Chromatography, Ion Exchange","Cloning, Molecular","Electrophoresis, Polyacrylamide Gel","Escherichia coli","Kinetics","Molecular Sequence Data","Oligodeoxyribonucleotides","Recombinant Proteins","Mutagenesis, Site-Directed","Protein Tyrosine Phosphatases","Conserved Sequence","Point Mutation","Leukocyte Common Antigens","Mice"],"keywords":["Protein tyrosine phosphatase","Phosphatase","DUSP6","Point mutation","HAMP domain","Biochemistry","Acid phosphatase","Transmembrane domain","Amino acid","Molecular biology","Tyrosine","Enzyme","Cytoplasm","Chemistry","Cysteine","Biology","Protein phosphatase 2","Mutation","Peptide sequence","Gene"],"sdg_mappings":[],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-08-13T00:47:29.754898Z","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":[]}