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UniProt functional annotation for P48740 | ||
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| UniProt code: P48740. |
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| Organism: | |
Homo sapiens (Human). |
| Taxonomy: | |
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo. |
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| Function: | |
Functions in the lectin pathway of complement, which performs a key role in innate immunity by recognizing pathogens through patterns of sugar moieties and neutralizing them. The lectin pathway is triggered upon binding of mannan-binding lectin (MBL) and ficolins to sugar moieties which leads to activation of the associated proteases MASP1 and MASP2. Functions as an endopeptidase and may activate MASP2 or C2 or directly activate C3 the key component of complement reaction. Isoform 2 may have an inhibitory effect on the activation of the lectin pathway of complement or may cleave IGFBP5. Also plays a role in development (PubMed:21258343). {ECO:0000269|PubMed:11485744, ECO:0000269|PubMed:21258343}. |
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| Activity regulation: | |
Inhibited by SERPING1 and A2M. {ECO:0000269|PubMed:11527969, ECO:0000269|PubMed:12538697}. |
| Biophysicochemical properties: | |
Kinetic parameters: KM=0.10 mM for Ac-Gly-Lys-OMe (at 30 degrees Celsius) {ECO:0000269|PubMed:11527969, ECO:0000269|PubMed:12538697}; KM=310 uM for Bz-Arg-OEt (at 30 degrees Celsius) {ECO:0000269|PubMed:11527969, ECO:0000269|PubMed:12538697}; KM=4.8 uM for C2 (at 37 degrees Celsius) {ECO:0000269|PubMed:11527969, ECO:0000269|PubMed:12538697}; |
| Subunit: | |
Homodimer. Interacts with the oligomeric lectins MBL2, FCN2 and FCN3; triggers the lectin pathway of complement through activation of C3. Interacts with SERPING1. Interacts with COLEC11; probably triggers the lectin pathway of complement (PubMed:20956340). {ECO:0000269|PubMed:10679061, ECO:0000269|PubMed:10878362, ECO:0000269|PubMed:10946292, ECO:0000269|PubMed:11290788, ECO:0000269|PubMed:11907111, ECO:0000269|PubMed:12421953, ECO:0000269|PubMed:18596036, ECO:0000269|PubMed:20956340, ECO:0000269|PubMed:9087411}. |
| Subcellular location: | |
Secreted {ECO:0000269|PubMed:11485744}. |
| Tissue specificity: | |
Protein of the plasma which is primarily expressed by liver. {ECO:0000269|PubMed:11485744, ECO:0000269|PubMed:8018603, ECO:0000269|PubMed:8240317, ECO:0000269|PubMed:9367419}. |
| Ptm: | |
The iron and 2-oxoglutarate dependent 3-hydroxylation of aspartate and asparagine is (R) stereospecific within EGF domains. {ECO:0000250}. |
| Ptm: | |
N-glycosylated. Some N-linked glycan are of the complex-type (By similarity). {ECO:0000250}. |
| Ptm: | |
Autoproteolytic processing of the proenzyme produces the active enzyme composed on the heavy and the light chain held together by a disulfide bond. Isoform 1 but not isoform 2 is activated through autoproteolytic processing. {ECO:0000269|PubMed:11290788}. |
| Disease: | |
3MC syndrome 1 (3MC1) [MIM:257920]: A form of 3MC syndrome, an autosomal recessive disorder characterized by facial dysmorphism, craniosynostosis, learning disability, and genital, limb and vesicorenal anomalies. Facial features include hypertelorism, blepharophimosis, blepharoptosis and highly arched eyebrows, cleft lip and/or palate. The term 3MC syndrome includes Carnevale, Mingarelli, Malpuech, and Michels syndromes. {ECO:0000269|PubMed:21258343, ECO:0000269|PubMed:26419238, ECO:0000269|PubMed:28301481}. Note=The disease is caused by variants affecting the gene represented in this entry. |
| Similarity: | |
Belongs to the peptidase S1 family. {ECO:0000255|PROSITE- ProRule:PRU00274}. |
| Sequence caution: | |
Sequence=AAH39724.1; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305}; |
Annotations taken from UniProtKB at the EBI.