25422-31-5
基本信息
血纖維蛋白肽A(人)
FIBRINOPEPTIDEA 人
FIBRINOPEPTIDE A
ADSGEGDFLAEGGGVR
Human fibrinopeptide A
FIBRINOPEPTIDE A, HUMAN
ADSGEGDFLAEGGGVR, HUMAN
fibrinogen alphaA(1-16)
FIBRINOPEPTIDE A, HUMAN USP/EP/BP
ALA-ASP-SER-GLY-GLU-GLY-ASP-PHE-LEU-ALA-GLU-GLY-GLY-VAL-ARG
ALA-ASP-SER-GLY-GLU-GLY-ASP-PHE-LEU-ALA-GLU-GLY-GLY-GLY-VAL-ARG
物理化學(xué)性質(zhì)
常見問題列表
纖維蛋白肽A(人)是在凝血酶作用下,纖維蛋白原α(A)鏈的精-16和甘-17之間的肽鏈裂解,釋放出由1~16個氨基酸組成的FPA。是反映體內(nèi)凝血活性及纖維蛋白最終形成血栓的可靠指標(biāo)。血纖維蛋白肽A(人)為在纖維蛋白原活化過程中,最先由纖維蛋白原α鏈上水解下的片段。
血纖維蛋白肽A(人)的前體蛋白為Fibrinogen。Fibrinogen中含有一信號肽,由19個氨基酸組成,位于原蛋白的1~19區(qū)域。因為含有信號肽的蛋白質(zhì)一般能夠被分泌到胞外,作為細(xì)胞因子起作用,所以可以認(rèn)為Fibrinogen是一個分泌蛋白。原蛋白被分泌到胞外時,信號肽被剪切留在胞內(nèi),剩下的位于20~664區(qū)域的氨基酸鏈則被分泌到胞外成為兩個成熟蛋白,分別為20~35的血纖維蛋白肽A(人)和35~664的Fibrinogen,alphachain,isoformalpha。血纖維蛋白肽A(人)的氨基酸數(shù)目為16個,相對分子質(zhì)量為1536.5,等電點為3.92;負(fù)電荷殘基總數(shù)(Asp+Glu)為4;正電荷殘基總數(shù)(Arg+Lys)為1;半衰期為4.4h;不穩(wěn)定系數(shù)為22.11,該蛋白分類為穩(wěn)定蛋白;脂肪系數(shù)為55.00;親水性評估為-0.431。
The conversion of monomeric fibrinogen into polymeric fibrin is mediated by thrombin, which binds to the central region of fibrinogen and catalyzes cleavage of the 2 short peptides, the 16-residue fibrinopeptide A (FpA) and the 14-residue fibrinopeptide B (FpB), located at the NH 2 -termini of the Aα and Bβ chains, respectively.
Fibrinopeptide A (FPA) is a small polypeptide cleaved from fibrinogen by thrombin, has a short half-life, and is considered a sensitive biochemical marker of thrombin activity, fibrin generation, and ongoing thrombosis.