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  Tissue-type plasminogen activator

SourceHomo sapiens (human)
Taxonomy Homo sapiens Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo.
Keywords3D-structure; Alternative splicing; Cleavage on pair of basic residues; Complete proteome; Direct protein sequencing; Disulfide bond; EGF-like domain; Glycoprotein; Hydrolase; Kringle; Pharmaceutical; Plasminogen activation; Polymorphism; Protease; Repeat; Secreted; Serine protease; Signal; Zymogen.
Details
Function: Converts the abundant, but inactive, zymogen plasminogen to plasmin by hydrolyzing a single Arg-Val bond in plasminogen. By controlling plasmin-mediated proteolysis, it plays an important role in tissue remodeling and degradation, in cell migration and many other physiopathological events. Play a direct role in facilitating neuronal migration.

Post-translational modification: The single chain, almost fully active enzyme, can be further processed into a two-chain fully active form by a cleavage after Arg-310 catalyzed by plasmin, tissue kallikrein or factor Xa. Differential cell-specific N-linked glycosylation gives rise to two glycoforms, type I (glycosylated at Asn-219) and type II (not glycosylated at Asn-219). The single chain type I glycoform is less readily converted into the two-chain form by plasmin, and the two-chain type I glycoform has a lower activity than the two-chain type II glycoform in the presence of fibrin. N-glycosylation of Asn-152; the bound oligomannosidic glycan is involved in the interaction with the mannose receptor. Characterization of O-linked glycan was studied in Bowes melanoma cell line.

Similarity: Belongs to the peptidase S1 family. Contains 1 EGF-like domain. Contains 1 fibronectin type-I domain. Contains 2 kringle domains. Contains 1 peptidase S1 domain.

Subcellular location: Secreted, extracellular space.

Subunit structure: Heterodimer of chain A and chain B held by a disulfide bond. Binds to fibrin with high affinity. This interaction leads to an increase in the catalytic efficiency of the enzyme between 100-fold and 1000-fold, due to an increase in affinity for plasminogen. Similarly, binding to heparin increases the activation of plasminogen. Binds to annexin A2, cytokeratin-8, fibronectin and laminin. Binds to mannose receptor and the low-density lipoprotein receptor-related protein (LRP1); these proteins are involved in TPA clearance. Yet unidentified interactions on endothelial cells and vascular smooth muscle cells (VSMC) lead to a 100-fold stimulation of plasminogen activation. In addition, binding to VSMC reduces TPA inhibition by PAI-1 by 30-fold. Binds LRP1B; binding is followed by internalization and degradation.

Tissue specificity: Synthesized in numerous tissues (including tumors) and secreted into most extracellular body fluids, such as plasma, uterine fluid, saliva, gingival crevicular fluid, tears, seminal fluid, and milk.

Disease: Increased activity of TPA is the cause of hyperfibrinolysis

Alternative products: Event=Alternative splicing; Named isoforms=4; Name=1; Synonyms=Long; IsoId=P00750-1; Sequence=Displayed; Name=2; Synonyms=Short; IsoId=P00750-2; Sequence=VSP_005411, VSP_005412; Note=May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay; Name=3; IsoId=P00750-3; Sequence=VSP_015957; Note=No experimental confirmation available; Name=4; Synonyms=Neonatal; IsoId=P00750-4; Sequence=VSP_028029, VSP_028030; Note=No experimental confirmation available.

Sequence length: 562 AA.

Sequence
MDAMKRGLCCVLLLCGAVFVSPSQEIHARFRRGARSYQVICRDEKTQMIYQQHQSWLRPV
LRSNRVEYCWCNSGRAQCHSVPVKSCSEPRCFNGGTCQQALYFSDFVCQCPEGFAGKCCE
IDTRATCYEDQGISYRGTWSTAESGAECTNWNSSALAQKPYSGRRPDAIRLGLGNHNYCR
NPDRDSKPWCYVFKAGKYSSEFCSTPACSEGNSDCYFGNGSAYRGTHSLTESGASCLPWN
SMILIGKVYTAQNPSAQALGLGKHNYCRNPDGDAKPWCHVLKNRRLTWEYCDVPSCSTCG
LRQYSQPQFRIKGGLFADIASHPWQAAIFAKHRRSPGERFLCGGILISSCWILSAAHCFQ
ERFPPHHLTVILGRTYRVVPGEEEQKFEVEKYIVHKEFDDDTYDNDIALLQLKSDSSRCA
QESSVVRTVCLPPADLQLPDWTECELSGYGKHEALSPFYSERLKEAHVRLYPSSRCTSQH
LLNRTVTDNMLCAGDTRSGGPQANLHDACQGDSGGPLVCLNDGRMTLVGIISWGLGCGQK
DVPGVYTKVTNYLDWIRDNMRP
Accession NumberP00750 
PubMed ID6337343, 6089198, 3009482, 3090401, 2824147, 3133640, 2107528, 14702039, 15489334, 3161893, 1368681, 6682760, 6433976, 6572897, 2513186, 1900431, 1645336, 11384978, 14759258, 2558718, 1901789, 1762144, 1310033, 1602484, 7582899, 8613982, 9305622 
CTD DB5327
eggNOG DBprNOG16610
Ensembl DBENST00000220809
CATHG3DSA:2.10.70.10, G3DSA:2.40.20.10
Genecard DBGC08M042151
GeneID DB5327
GermOnline DBENSG00000104368
GO DB0005615, 0004252, 0007596, 0006464, 0006508
HGNC DB9051
HPA DBCAB009335, HPA003412
InterPro DBIPR016060, IPR006209, IPR006210, IPR013032, IPR000742, IPR000083, IPR000001, IPR013806, IPR018056, IPR018059, IPR018114, IPR001254, IPR001314, IPR009003
H-InvDBHIX0007476
IPI DBIPI00019590, IPI00479511, IPI00910450, IPI00953228
KEGGhsa:5327
NCBIL00153, AAB59510, L00141, L00142, L00143, L00144, L00145, L00146, L00147, L00148, L00149, L00150, L00151, K03021, AAA98809, M15518, AAA60111, M18182, AAA36800, X07393, CAA30302, X13097, CAA31489, AF260825, AAK11956, AY221101, AAO34406, AK289387, BAF82076, AK290575, BAF83264, AK313342, BAG36145, BT007060, AAP35709, AY291060, AAP34246, CH471080.2, EAW63235, EAW63233, BC002795.2, AAH02795.3, BC007231, AAH07231, BC013968.2, AAH13968.3, BC018636.2, AAH18636.3, BC095403, AAH95403, M11890, AAA61213, M11889, D01096, BAA00881, V00570, CAA23833, NP_000921, NP_127509
OMATCGLRQY
OMIM105200, 134820, 202400, 134830, 202400, 134850, 202400, 176930, 601367, 134390, 188055, 227400, 600880, 601367, 612309, 227500, 134500, 306700, 300746, 306900, 227600, 176860, 188050, 612283, 612304, 176880, 612336, 264900, 612416, 234000, 610618, 610619, 229000, 612423, 107300, 188050, 134570, 134580, 193400, 277480, 228960, 612358, 176895, 173350, 188050, 217090, 173370
OrthoDBEOG9TQPVK
PDB1A5H_A, 1A5H_B, 1A5H_C, 1A5H_D, 1BDA_A, 1BDA_B, 1PK2_A, 1PML_A, 1PML_B, 1PML_C, 1RTF_B, 1TPG_A, 1TPK_A, 1TPK_B, 1TPK_C, 1TPM_A, 1TPN_A
PfamPF00008, PF00039, PF00051, PF00089
PharmaGKBPA33381
PROSITE DBPS00022, PS01186, PS50026, PS01253, PS51091, PS00021, PS50070, PS50240, PS00134, PS00135
SMART DBSM00181, SM00058, SM00130, SM00020
UCSCuc003xos.2, uc003xot.2, uc010lxf.1
UniGeneHs.491582



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