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   Fibrinogen alpha chain

SourceHomo sapiens (human)
Taxonomy Homo sapiens Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo.
Keywords3D-structure; Alternative splicing; Amyloid; Amyloidosis; Blood coagulation; Coiled coil; Complete proteome; Direct protein sequencing; Disease mutation; Disulfide bond; Glycoprotein; Isopeptide bond; Phosphoprotein; Polymorphism; Secreted; Signal.
Details
Function: Fibrinogen has a double function: yielding monomers that polymerize into fibrin and acting as a cofactor in platelet aggregation.

Post-translational modification: The alpha chain is not glycosylated. Forms F13A-mediated cross-links between a glutamine and the epsilon-amino group of a lysine residue, forming fibronectin-fibrinogen heteropolymers. About one-third of the alpha chains in the molecules in blood were found to be phosphorylated. Conversion of fibrinogen to fibrin is triggered by thrombin, which cleaves fibrinopeptides A and B from alpha and beta chains, and thus exposes the N-terminal polymerization sites responsible for the formation of the soft clot. The soft clot is converted into the hard clot by factor XIIIA which catalyzes the epsilon-(gamma-glutamyl)lysine cross-linking between gamma chains (stronger) and between alpha chains (weaker) of different monomers. Phosphorylation sites are present in the extracelllular medium.

Similarity: Contains 1 fibrinogen C-terminal domain.

Subcellular location: Secreted.

Subunit structure: Heterohexamer; disulfide linked. Contains 2 sets of 3 non-identical chains (alpha, beta and gamma). The 2 heterotrimers are in head to head conformation with the N-termini in a small central domain.

Tissue specificity: Plasma.

Disease: Defects in FGA are a cause of congenital afibrinogenemia Variations in position Arg-35 (the site of cleavage of fibrinopeptide a by thrombin) leads to alpha-dysfibrinogenemias. Defects in FGA are a cause of amyloidosis type 8 (AMYL8)

Interaction: P48634:BAT2; NbExp=1; IntAct=EBI-348571, EBI-347545; Q92876:KLK6; NbExp=1; IntAct=EBI-348571, EBI-2432309.

Alternative products: Event=Alternative splicing; Named isoforms=2; Name=1; Synonyms=Alpha-E; IsoId=P02671-1; Sequence=Displayed; Name=2; Synonyms=Alpha; IsoId=P02671-2; Sequence=VSP_001531, VSP_001532; Note=Ref.3 (AAK31372) sequence is in conflict in positions: 640:PSLSP->LPCPPRLS.

Sequence length: 866 AA.

Sequence
MFSMRIVCLVLSVVGTAWTADSGEGDFLAEGGGVRGPRVVERHQSACKDSDWPFCSDEDW
NYKCPSGCRMKGLIDEVNQDFTNRINKLKNSLFEYQKNNKDSHSLTTNIMEILRGDFSSA
NNRDNTYNRVSEDLRSRIEVLKRKVIEKVQHIQLLQKNVRAQLVDMKRLEVDIDIKIRSC
RGSCSRALAREVDLKDYEDQQKQLEQVIAKDLLPSRDRQHLPLIKMKPVPDLVPGNFKSQ
LQKVPPEWKALTDMPQMRMELERPGGNEITRGGSTSYGTGSETESPRNPSSAGSWNSGSS
GPGSTGNRNPGSSGTGGTATWKPGSSGPGSTGSWNSGSSGTGSTGNQNPGSPRPGSTGTW
NPGSSERGSAGHWTSESSVSGSTGQWHSESGSFRPDSPGSGNARPNNPDWGTFEEVSGNV
SPGTRREYHTEKLVTSKGDKELRTGKEKVTSGSTTTTRRSCSKTVTKTVIGPDGHKEVTK
EVVTSEDGSDCPEAMDLGTLSGIGTLDGFRHRHPDEAAFFDTASTGKTFPGFFSPMLGEF
VSETESRGSESGIFTNTKESSSHHPGIAEFPSRGKSSSYSKQFTSSTSYNRGDSTFESKS
YKMADEAGSEADHEGTHSTKRGHAKSRPVRDCDDVLQTHPSGTQSGIFNIKLPGSSKIFS
VYCDQETSLGGWLLIQQRMDGSLNFNRTWQDYKRGFGSLNDEGEGEFWLGNDYLHLLTQR
GSVLRVELEDWAGNEAYAEYHFRVGSEAEGYALQVSSYEGTAGDALIEGSVEEGAEYTSH
NNMQFSTFDRDADQWEENCAEVYGGGWWYNNCQAANLNGIYYPGGSYDPRNNSPYEIENG
VVWVSFRGADYSLRAVRMKIRPLVTQ
Accession NumberP02671 
PubMed ID1457396, 15489334, 2102623, 6575389, 6688355, 518846, 6689067, 6575700, 518845, 632262, 16335952, 936108, 6383194, 2877981, 6318767, 16807684, 18083107, 18088087, 19159218, 19824718, 1560020, 9333233, 9628725, 9689040, 10074346, 2070049, 1634621, 1675636, 8473507, 8097946, 8461606, 8675656, 10391209 
CEX DBHS_FGA
CTD DB2243
DIP DBDIP-29643N
eggNOG DBprNOG19217
Ensembl DBENST00000302053
CATHG3DSA:3.90.215.10, G3DSA:1.20.5.50
Genecard DBGC04M155723
GeneID DB2243
GermOnline DBENSG00000171560
GO DB0009897, 0005577, 0031093, 0043499, 0030674, 0005102, 0030168, 0051258, 0051592, 0007165
HGNC DB3661
HOGENOM DBHBG716848
HPA DBCAB016776
InterPro DBIPR002181, IPR014716, IPR012290, IPR014814, IPR020837
H-InvDBHIX0031437
IPI DBIPI00021885, IPI00029717
KEGGhsa:2243
NCBIM64982, AAA17056, AAA17055, M58569, AAC97142, AAC97143, AF361104.2, AAK31372, AAK31373, CH471056.2, EAX04927, BC098280, AAH98280, BC099706, AAH99706, BC099720, AAH99720, BC101935, AAI01936, J00128, AAA52427, J00127, AAA52426, K02272, AAA52428, M26878, AAA52444, NP_000499, NP_068657
NMPDR fig|9606.3.peg.24776
OMAPGSTGTW
OMIM105200, 134820, 202400
Orphanet DB85450, 69, 335, 98880, 98881, 101041
OrthoDBEOG99CSSW
PDB1BBR_F, 1BBR_G, 1BBR_I, 1FZA_A, 1FZA_D, 1FZB_A, 1FZB_D, 1FZC_A, 1FZC_D, 1FZD_A, 1FZD_B, 1FZD_C, 1FZD_D, 1FZD_E, 1FZD_F, 1FZD_G, 1FZD_H, 1FZE_A, 1FZE_D, 1FZF_A, 1FZF_D, 1FZG_A, 1FZG_D, 1LT9_A, 1LT9_D, 1LTJ_A, 1LTJ_D, 1N86_A, 1N86_D, 1N8E_A, 1N8E_D, 1RE3_A, 1RE3_D, 1RE4_A, 1RE4_D, 1RF0_A, 1RF0_D, 1RF1_A, 1RF1_D, 1YCP_F, 1YCP_N, 2A45_G, 2A45_J, 2FFD_A, 2FFD_D, 2H43_A, 2H43_D, 2HLO_A, 2HLO_D, 2HOD_A, 2HOD_D, 2HOD_G, 2HOD_J, 2HPC_A, 2HPC_D, 2HPC_G, 2HPC_J, 2OYH_A, 2OYH_D, 2OYI_A, 2OYI_D, 2Q9I_A, 2Q9I_D, 2Z4E_A, 2Z4E_D, 3BVH_A, 3BVH_D, 3E1I_A, 3E1I_D, 3GHG_A, 3GHG_D, 3GHG_G, 3GHG_J, 3H32_A, 3H32_D, 3HUS_A, 3HUS_D
PfamPF08702, PF00147
PharmaGKBPA429
PROSITE DBPS00514, PS51406
SMART DBSM00186
UCSCuc003iod.1
UniGeneHs.351593



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