CR1 - complement C3b/C4b receptor 1 (Knops blood group) Gene
Also Known as KN; C3BR; C4BR; CD35
Species: Homo sapiens
About CR1
This gene has 12 transcripts (splice variants), 87 orthologues, 39 paralogues and is associated with 2 phenotypes. Biased expression in appendix (RPKM 18.3), spleen (RPKM 14.7) and 10 other tissues.
Summary
This gene is a member of the receptors of complement activation (RCA) family and is located in the 'cluster RCA' region of chromosome 1. The genome is polymorphic at this locus with allele-specific splice variants encoding different isoforms, based on the presence/absence of long homologous repeats (LHRs). The gene encodes a monomeric single-pass type I membrane glycoprotein found on erythrocytes, leukocytes, glomerular podocytes, and splenic follicular dendritic cells. The Knops blood group system is a system of antigens located on this protein. The protein mediates cellular binding to particles and immune complexes that have activated complement. Decreases in expression of this protein and/or mutations in this gene have been associated with gallbladder carcinomas, mesangiocapillary glomerulonephritis, systemic lupus erythematosus, sarcoidosis and Alzheimer's disease. Mutations in this gene have also been associated with a reduction in Plasmodium falciparum rosetting, conferring protection against severe malaria. [provided by RefSeq, May 2020]
CR1 Products (3)
| mRNA | Protein | Name |
|---|---|---|
| NM_000573.4 | NP_000564.2 | complement receptor type 1 isoform F precursor |
| NM_000651.6 | NP_000642.3 | complement receptor type 1 isoform S precursor |
| NM_001381851.1 | NP_001368780.1 | complement receptor type 1 isoform 3 precursor |
| Molecular Function GO Annotation | Evidence | References | Source |
|---|---|---|---|
| enables complement component C3b binding |
IDA
IDA: Inferred from direct assay
|
2972794 | GOA |
| enables complement component C3b receptor activity |
IDA
IDA: Inferred from direct assay
|
2972794 | GOA |
| enables complement component C4b binding |
IDA
IDA: Inferred from direct assay
|
2972794 | GOA |
| enables complement component C4b receptor activity |
IDA
IDA: Inferred from direct assay
|
2972794 | GOA |
| enables protein binding |
IPI
IPI: Inferred from physical interaction
|
18684861 | GOA |
| Cellular Component GO Annotation | Evidence | References | Source |
|---|---|---|---|
| located in cell surface |
IDA
IDA: Inferred from direct assay
|
2972794 | GOA |
| located in cytoskeleton |
IDA
IDA: Inferred from direct assay
|
18684861 | GOA |
| located in plasma membrane |
IDA
IDA: Inferred from direct assay
|
6910481 | GOA |
| located in plasma membrane raft |
IDA
IDA: Inferred from direct assay
|
24022490 | GOA |
CR1 Protein Structure
Sushi: Sushi repeat (SCR repeat) (43 - 99)
Sushi: Sushi repeat (SCR repeat) (104 - 161)
Sushi: Sushi repeat (SCR repeat) (166 - 232)
Sushi: Sushi repeat (SCR repeat) (238 - 293)
Sushi: Sushi repeat (SCR repeat) (297 - 353)
Sushi: Sushi repeat (SCR repeat) (375 - 416)
Sushi: Sushi repeat (SCR repeat) (421 - 487)
Sushi: Sushi repeat (SCR repeat) (493 - 549)
Sushi: Sushi repeat (SCR repeat) (554 - 611)
Sushi: Sushi repeat (SCR repeat) (616 - 682)
Sushi: Sushi repeat (SCR repeat) (688 - 743)
Sushi: Sushi repeat (SCR repeat) (747 - 803)
Sushi: Sushi repeat (SCR repeat) (825 - 866)
Sushi: Sushi repeat (SCR repeat) (871 - 937)
Sushi: Sushi repeat (SCR repeat) (943 - 999)
Sushi: Sushi repeat (SCR repeat) (1004 - 1061)
Sushi: Sushi repeat (SCR repeat) (1066 - 1132)
Sushi: Sushi repeat (SCR repeat) (1138 - 1193)
Sushi: Sushi repeat (SCR repeat) (1197 - 1253)
Sushi: Sushi repeat (SCR repeat) (1274 - 1316)
Sushi: Sushi repeat (SCR repeat) (1321 - 1387)
Sushi: Sushi repeat (SCR repeat) (1396 - 1452)
Sushi: Sushi repeat (SCR repeat) (1457 - 1514)
Sushi: Sushi repeat (SCR repeat) (1519 - 1585)
Sushi: Sushi repeat (SCR repeat) (1591 - 1646)
Sushi: Sushi repeat (SCR repeat) (1650 - 1706)
Sushi: Sushi repeat (SCR repeat) (1718 - 1769)
Sushi: Sushi repeat (SCR repeat) (1774 - 1840)
Sushi: Sushi repeat (SCR repeat) (1848 - 1900)
Sushi: Sushi repeat (SCR repeat) (1923 - 1965)
- 0
- 400
- 800
- 1200
- 1600
- 2039 a.a.
| Protein Preferred Names | Protein Names | |
|---|---|---|
|
complement receptor type 1 |
|
CR1 Protein-protein interaction Information
|
Type
|
Protein Name | Protein ID | Interactor | Interactor Species | Interactor ID | Detection Method | References |
|---|---|---|---|---|---|---|---|
|
Intra
|
CR1 | P17927 | FCN3 | Homo sapiens | O75636 | 23460739 | |
|
Intra
|
CR1 | P17927 | MBL2 | Homo sapiens | P11226 | 23460739 | |
|
Intra
|
CR1 | P17927 | FCN2 | Homo sapiens | Q15485 | 23460739 |
CR1 Antibodies
| Cat. No. | Product Name | Application | Reactivity |
|---|---|---|---|
| HY-P81583 | CD35 Antibody (YA1328) | IHC-P | Human |
| HY-P81583A | CD35 Antibody (YA1328)(PBS only) | IHC-P | Human |
| HY-P85894 | CD35 Antibody (YA5586) | IHC-P, WB, ICC/IF, ELISA | Human |
| HY-P86007 | CD35 Antibody (YA5699) | IHC-P, ELISA | Human |
Related Diseases
| Diseases | Alias | |
|---|---|---|
| Malaria |
|
|
| Follicular Dendritic Cell Sarcoma |
|
|
| Plasmodium Falciparum Malaria |
|
|
| Complement Factor I Deficiency |
|
|
| Glomerulonephritis |
|
|
| Arthus Reaction |
|
|
| Parapharyngeal Meningioma |
|
|
| Histiocytic And Dendritic Cell Cancer |
|
|
| Castleman Disease |
|
|
| Hemoglobinuria |
|
|
| Lupus Erythematosus |
|
|
| Systemic Lupus Erythematosus |
|
|
| Mycetoma |
|
|
| Combined Oxidative Phosphorylation Deficiency 33 |
|
|
| Interdigitating Dendritic Cell Sarcoma |
|
|
| Myasthenia Gravis |
|
|
| Afibrinogenemia, Congenital |
|
|
| Follicular Lymphoma |
|
|
| Peritonitis |
|
|
| Hemolytic Anemia |
|
|
| Spinal Cord Lymphoma |
|
|
| Hereditary Angioedema |
|
|
| Vulvar Angiokeratoma |
|
|
| Granulomatous Gastritis |
|
|
| Langerhans Cell Sarcoma |
|
|
| Complement Component 3 Deficiency |
|
|
| Ureteral Lymphoma |
|
|
| Membranous Nephropathy |
|
|
| Endobronchial Leiomyoma |
|
|
| Adult Respiratory Distress Syndrome |
|
|
| Rheumatoid Arthritis |
|
|
| Hypersensitivity Reaction Type Iii Disease |
|
|
| Focal Segmental Glomerulosclerosis |
|
|
| Alzheimer Disease 4 |
|
|
| Hemolytic Uremic Syndrome, Atypical 1 |
|
|
| Inflammatory Myofibroblastic Tumor |
|
|
| Common Variable Immunodeficiency |
|
|
| Deficiency Anemia |
|
|
| Membranoproliferative Glomerulonephritis |
|
|
| Interstitial Lung Disease 2 |
|
|
| Cystic Fibrosis |
|
|
| Leukemia, Chronic Lymphocytic |
|
|
| Alzheimer Disease, Familial, 1 |
|
|