Q9UP52 (TFR2_HUMAN) Reviewed, UniProtKB/Swiss-Prot
Last modified
May 1, 2013.
Version 112.
History...
Names·Attributes·General annotation·Ontologies·Alt products·Sequence annotation·Sequences·References·Web links·Cross-refs·Entry info·DocumentsCustomize order
Names·Attributes·General annotation·Ontologies·Alt products·Sequence annotation·Sequences·References·Web links·Cross-refs·Entry info·DocumentsCustomize orderNames and origin
| Protein names | Recommended name: Transferrin receptor protein 2 Short name=TfR2 | ||
| Gene names |
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| Organism | Homo sapiens (Human) [Reference proteome] | ||
| Taxonomic identifier | 9606 [NCBI] | ||
| Taxonomic lineage | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo![]() |
Protein attributes
| Sequence length | 801 AA. |
| Sequence status | Complete. |
| Protein existence | Evidence at protein level |
General annotation (Comments)
| Function | Mediates cellular uptake of transferrin-bound iron in a non-iron dependent manner. May be involved in iron metabolism, hepatocyte function and erythrocyte differentiation. |
| Subunit structure | Homodimer. |
| Subcellular location | Cell membrane; Single-pass type II membrane protein. Isoform Beta: Cytoplasm Probable. Note: Lacks the transmembrane domain. Probably intracellular. |
| Tissue specificity | Predominantly expressed in liver. While the alpha form is also expressed in spleen, lung, muscle, prostate and peripheral blood mononuclear cells, the beta form is expressed in all tissues tested, albeit weakly. |
| Involvement in disease | Hemochromatosis 3 (HFE3) [MIM:604250]: A disorder of iron metabolism characterized by iron overload. Excess iron is deposited in a variety of organs leading to their failure, and resulting in serious illnesses including cirrhosis, hepatomas, diabetes, cardiomyopathy, arthritis, and hypogonadotropic hypogonadism. Severe effects of the disease usually do not appear until after decades of progressive iron loading. |
| Miscellaneous | The variant Lys-172 found in hereditary hemochromatosis type III affects the putative initiation codon of the beta isoform thus preventing its translation. |
| Sequence similarities | Belongs to the peptidase M28 family. M28B subfamily. |
| Sequence caution | The sequence BAA91153.1 differs from that shown. Reason: Erroneous initiation. |
Ontologies
| Keywords | |
|---|---|
| Cellular component | Cell membrane Cytoplasm Membrane |
| Coding sequence diversity | Alternative splicing Polymorphism |
| Disease | Disease mutation |
| Domain | Signal-anchor Transmembrane Transmembrane helix |
| Molecular function | Receptor |
| PTM | Disulfide bond Glycoprotein |
| Technical term | Complete proteome Reference proteome |
| Gene Ontology (GO) | |
| Biological_process | cellular iron ion homeostasis Traceable author statement PubMed 15319276. Source: UniProtKB iron ion transportNon-traceable author statement Ref.1. Source: UniProtKB proteolysisInferred from electronic annotation. Source: InterPro |
| Cellular_component | cytoplasm Inferred from electronic annotation. Source: UniProtKB-SubCell integral to plasma membraneNon-traceable author statement Ref.1. Source: UniProtKB |
| Molecular_function | peptidase activity Inferred from electronic annotation. Source: InterPro transferrin receptor activityNon-traceable author statement Ref.1. Source: UniProtKB |
| Complete GO annotation... | |
Alternative products
| This entry describes 3 isoforms produced by alternative splicing. [Align] [Select] | ||||||
| Isoform Alpha (identifier: Q9UP52-1) This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry. | ||||||
| Isoform Beta (identifier: Q9UP52-2) The sequence of this isoform differs from the canonical sequence as follows: 1-171: Missing. | ||||||
| Isoform Gamma (identifier: Q9UP52-3) The sequence of this isoform differs from the canonical sequence as follows: 343-369: Missing. |
Sequence annotation (Features)
| Feature key | Position(s) | Length | Description | Graphical view | Feature identifier | ||||
Molecule processing | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chain | 1 – 801 | 801 | Transferrin receptor protein 2 | PRO_0000174136 | |||||
Regions | |||||||||
| Topological domain | 1 – 83 | 83 | Cytoplasmic Potential | ||||||
| Transmembrane | 84 – 104 | 21 | Helical; Signal-anchor for type II membrane protein; Potential | ||||||
| Topological domain | 105 – 801 | 697 | Extracellular Potential | ||||||
| Motif | 23 – 26 | 4 | Endocytosis signal Potential | ||||||
Amino acid modifications | |||||||||
| Glycosylation | 240 | 1 | N-linked (GlcNAc...) Potential | ||||||
| Glycosylation | 339 | 1 | N-linked (GlcNAc...) Ref.8 | ||||||
| Glycosylation | 540 | 1 | N-linked (GlcNAc...) Potential | ||||||
| Glycosylation | 754 | 1 | N-linked (GlcNAc...) Ref.8 | ||||||
| Disulfide bond | 108 | Interchain Potential | |||||||
| Disulfide bond | 111 | Interchain Potential | |||||||
Natural variations | |||||||||
| Alternative sequence | 1 – 171 | 171 | Missing in isoform Beta. | VSP_005354 | |||||
| Alternative sequence | 343 – 369 | 27 | Missing in isoform Gamma. | VSP_005355 | |||||
| Natural variant | 22 | 1 | V → I in HFE3. Ref.12 | VAR_042515 | |||||
| Natural variant | 172 | 1 | M → K in HFE3. Ref.9 | VAR_012738 | |||||
| Natural variant | 230 | 1 | D → E. Corresponds to variant rs41303465 [ dbSNP | Ensembl ]. | VAR_034122 | |||||
| Natural variant | 238 | 1 | I → M. Corresponds to variant rs34242818 [ dbSNP | Ensembl ]. | VAR_034123 | |||||
| Natural variant | 455 | 1 | R → Q Hereditary hemochromatosis modifier. Ref.11 Corresponds to variant rs41303501 [ dbSNP | Ensembl ]. | VAR_042516 | |||||
| Natural variant | 690 | 1 | Q → P in HFE3. Ref.10 | VAR_042517 | |||||
| Natural variant | 752 | 1 | R → H. Corresponds to variant rs41295942 [ dbSNP | Ensembl ]. | VAR_034124 | |||||
Experimental info | |||||||||
| Sequence conflict | 712 | 1 | R → RIPLSAQV Ref.2 | ||||||
Sequences
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References
| « Hide 'large scale' references | |
| [1] | "Molecular cloning of transferrin receptor 2: a new member of the transferrin receptor-like family." Kawabata H., Yang R., Hirama T., Vuong P.T., Kawano S., Gombart A.F., Koeffler H.P. J. Biol. Chem. 274:20826-20832(1999) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORMS ALPHA AND BETA). Tissue: Erythroleukemia and Myeloid leukemia cell. |
| [2] | "Large-scale sequencing of two regions in human chromosome 7q22: analysis of 650 kb of genomic sequence around the EPO and CUTL1 loci reveals 17 genes." Gloeckner G., Scherer S., Schattevoy R., Boright A.P., Weber J., Tsui L.-C., Rosenthal A. Genome Res. 8:1060-1073(1998) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA] (ISOFORM GAMMA). |
| [3] | NHLBI resequencing and genotyping service (RS&G) Submitted (APR-2006) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]. |
| [4] | "The DNA sequence of human chromosome 7." Hillier L.W., Fulton R.S., Fulton L.A., Graves T.A., Pepin K.H., Wagner-McPherson C., Layman D., Maas J., Jaeger S., Walker R., Wylie K., Sekhon M., Becker M.C., O'Laughlin M.D., Schaller M.E., Fewell G.A., Delehaunty K.D., Miner T.L. Wilson R.K.Nature 424:157-164(2003) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. |
| [5] | "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)." The MGC Project Team Genome Res. 14:2121-2127(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA]. |
| [6] | "Complete sequencing and characterization of 21,243 full-length human cDNAs." Ota T., Suzuki Y., Nishikawa T., Otsuki T., Sugiyama T., Irie R., Wakamatsu A., Hayashi K., Sato H., Nagai K., Kimura K., Makita H., Sekine M., Obayashi M., Nishi T., Shibahara T., Tanaka T., Ishii S. Sugano S.Nat. Genet. 36:40-45(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] OF 1-158 AND 370-801. Tissue: Carcinoma and Embryo. |
| [7] | "The gene TFR2 is mutated in a new type of haemochromatosis mapping to 7q22." Camaschella C., Roetto A., Cali A., De Gobbi M., Garozzo G., Carella M., Majorano N., Totaro A., Gasparini P. Nat. Genet. 25:14-15(2000) [PubMed] [Europe PMC] [Abstract] Cited for: DISEASE. |
| [8] | "Glycoproteomics analysis of human liver tissue by combination of multiple enzyme digestion and hydrazide chemistry." Chen R., Jiang X., Sun D., Han G., Wang F., Ye M., Wang L., Zou H. J. Proteome Res. 8:651-661(2009) [PubMed] [Europe PMC] [Abstract] Cited for: GLYCOSYLATION [LARGE SCALE ANALYSIS] AT ASN-339 AND ASN-754, MASS SPECTROMETRY. Tissue: Liver. |
| [9] | "New mutations inactivating transferrin 2 in hemochromatosis type 3." Roetto A., Totaro A., Piperno A., Piga A., Longo F., Garozzo G., Cali A., De Gobbi M., Gasparini P., Camaschella C. Blood 97:2555-2560(2001) [PubMed] [Europe PMC] [Abstract] Cited for: VARIANT HFE3 LYS-172. |
| [10] | "Transferrin receptor 2 (TfR2) and HFE mutational analysis in non-C282Y iron overload: identification of a novel TfR2 mutation." Mattman A., Huntsman D., Lockitch G., Langlois S., Buskard N., Ralston D., Butterfield Y., Rodrigues P., Jones S., Porto G., Marra M., De Sousa M., Vatcher G. Blood 100:1075-1077(2002) [PubMed] [Europe PMC] [Abstract] Cited for: VARIANT HFE3 PRO-690. |
| [11] | "Mutation analysis of transferrin-receptor 2 in patients with atypical hemochromatosis." Hofmann W.-K., Tong X.-J., Ajioka R.S., Kushner J.P., Koeffler H.P. Blood 100:1099-1100(2002) [PubMed] [Europe PMC] [Abstract] Cited for: VARIANT GLN-455. |
| [12] | "Identification of new mutations of the HFE, hepcidin, and transferrin receptor 2 genes by denaturing HPLC analysis of individuals with biochemical indications of iron overload." Biasiotto G., Belloli S., Ruggeri G., Zanella I., Gerardi G., Corrado M., Gobbi E., Albertini A., Arosio P. Clin. Chem. 49:1981-1988(2003) [PubMed] [Europe PMC] [Abstract] Cited for: VARIANT HFE3 ILE-22. |
| + | Additional computationally mapped references. |
Web resources
Cross-references
Sequence databases | |
|---|---|
| EMBL GenBank DDBJ | AF067864 mRNA. Translation: AAD45561.1. AF053356 Genomic DNA. Translation: AAC78796.1. DQ496110 Genomic DNA. Translation: ABF47099.1. AC099394 Genomic DNA. No translation available. BC142630 mRNA. Translation: AAI42631.1. AK022002 mRNA. Translation: BAB13951.1. AK000421 mRNA. Translation: BAA91153.1. Different initiation. |
| IPI | IPI00215612. IPI00219900. IPI00219901. |
| RefSeq | NP_001193784.1. NM_001206855.1. NP_003218.2. NM_003227.3. |
| UniGene | Hs.544932. |
3D structure databases | |
| ProteinModelPortal | Q9UP52. |
| ModBase | Search... |
Protein-protein interaction databases | |
| IntAct | Q9UP52. 1 interaction. |
| STRING | 9606.ENSP00000223051. |
Protein family/group databases | |
| MEROPS | M28.973. |
PTM databases | |
| PhosphoSite | Q9UP52. |
Polymorphism databases | |
| DMDM | 20140912. |
Proteomic databases | |
| PaxDb | Q9UP52. |
| PRIDE | Q9UP52. |
Protocols and materials databases | |
| StructuralBiologyKnowledgebase | Search... |
Genome annotation databases | |
| Ensembl | ENST00000223051; ENSP00000223051; ENSG00000106327. ENST00000462107; ENSP00000420525; ENSG00000106327. ENST00000544242; ENSP00000443656; ENSG00000106327. |
| GeneID | 7036. |
| KEGG | hsa:7036. |
| UCSC | uc003uvu.1. human. uc010lhc.1. human. |
Organism-specific databases | |
| CTD | 7036. |
| GeneCards | GC07M100218. |
| HGNC | HGNC:11762. TFR2. |
| HPA | CAB016255. HPA011937. |
| MIM | 604250. phenotype. 604720. gene. |
| neXtProt | NX_Q9UP52. |
| Orphanet | 225123. Hemochromatosis type 3. |
| PharmGKB | PA36477. |
| GenAtlas | Search... |
Phylogenomic databases | |
| eggNOG | NOG74799. |
| HOGENOM | HOG000124067. |
| HOVERGEN | HBG023177. |
| InParanoid | Q9UP52. |
| OMA | LEGYLSV. |
| OrthoDB | EOG41RPTM. |
Gene expression databases | |
| ArrayExpress | Q9UP52. |
| Bgee | Q9UP52. |
| CleanEx | HS_TFR2. |
| Genevestigator | Q9UP52. |
| GermOnline | ENSG00000106327. Homo sapiens. |
Family and domain databases | |
| Gene3D | 1.20.930.40. 1 hit. |
| InterPro | IPR007484. Peptidase_M28. IPR003137. Protease-assoc_domain. IPR007365. TFR-like_dimer_dom. [Graphical view] |
| Pfam | PF02225. PA. 1 hit. PF04389. Peptidase_M28. 1 hit. PF04253. TFR_dimer. 1 hit. [Graphical view] |
| SUPFAM | SSF47672. Transferrin_rcpt-like_dimerise. 1 hit. |
| ProtoNet | Search... |
Other | |
| GenomeRNAi | 7036. |
| NextBio | 27489. |
| SOURCE | Search... |
Entry information
| Entry name | TFR2_HUMAN | ||||||||
| Accession | Primary (citable) accession number: Q9UP52 Secondary accession number(s): A6NGM7 Q9NX67 | ||||||||
| Entry history |
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| Entry status | Reviewed (UniProtKB/Swiss-Prot) | ||||||||
| Annotation program | Chordata Protein Annotation Program | ||||||||
| Disclaimer | Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. | ||||||||
Relevant documents
| Peptidase families Classification of peptidase families and list of entries |
| Human chromosome 7 Human chromosome 7: entries, gene names and cross-references to MIM |
| Human entries with polymorphisms or disease mutations List of human entries with polymorphisms or disease mutations |
| Human polymorphisms and disease mutations Index of human polymorphisms and disease mutations |
| MIM cross-references Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot |
| SIMILARITY comments Index of protein domains and families |

Clusters with
