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主营:血浆蛋白
℡ 4000-520-616
℡ 4000-520-616
Haematologic Technologies/Human Fibrinogen and Fragments - Haematologic Technologies, Inc./MCI-5150/MCI-5150-1 mg
产品编号:MCI-5150-1mg
市  场 价:¥8900.00
场      地:美国(厂家直采)
产品分类: 蛋白类>蛋白纯化>透析>
联系QQ:1570468124
电话号码:4000-520-616
邮      箱: info@ebiomall.com
美  元  价:$445.00
品      牌: haemtech
公      司:Haematologic Technologies Inc.
公司分类:
Haematologic Technologies/Human Fibrinogen and Fragments - Haematologic Technologies, Inc./MCI-5150/MCI-5150-1 mg
商品介绍

The thrombin (IIa) catalyzed cleavage of soluble fibrinogen (Fbg) to form fibrin (Fbn) is the terminal proteolytic event in the coagulation cascade. These soluble Fbn monomers spontaneously polymerize to form an insoluble Fbn network which is stabilized by the factor XIIIa catalyzed crosslinking of lys and glu residues of α and γ chains. This Fbn network is the major protein component of the hemostatic plug.

Plasma fibrinogen is large glycoprotein (Mr=340,000) synthesized in the liver and circulating at a concentration of 2.6 mg/ml. It is a disulfide linked dimer composed of 3 pairs of disulfide linked non-identical polypeptide chains (Aα, Bβ and γ). Notable features of the Aα chain are the N-terminal peptide (fibrinopeptide A (FPA, 1-16)), factor XIIIa crosslinking sites and 2 phosphorylation sites. When synthesized, Fbg is fully phosphorylated, but circulates at only 20-30% phosphorylation. The Bβ chain contains fibrinopeptide B (FPB, 1-14), one of the 3 N-linked carbohydrate moieties (Mr=2500) and an N-terminal pyroglutamic acid. The γ chain contains the other N-linked glycosylation site and a factor XIIIa crosslinking sites. The 2 elongated subunits ((AαBβγ)2) are aligned in an antiparallel manner forming a trinodular arrangement of the six chains. The nodes are formed by disulfide rings between the 3 parallel chains. The central node (n-disulfide knot, E domain) is formed by the N-termini of all six chains held together by 11 disulfide bonds. This region contains the 2 IIa-sensitive sites. The release of FPA by cleavage at R16-G17 generates Fbn I, exposing a polymerization site (17-20) on the Aα chain. These regions bind to complimentary regions on the D domain of Fbn to form protofibrils. Subsequent IIa cleavage of FPB (R14-G15) from the Bβ chain exposes additional polymerization sites and promotes lateral growth of the Fbn network.

Each of the 2 domains between the central node (E domain) and the C-terminal nodes (D domain) is composed of parallel α-helical regions of the Aα, Bβ and γ chains coiled around each other to form a "coiled coil" with polar residues directed outward and nonpolar residues forming a hydrophobic core. In this region, all 3 chains possess a protease (plasmin) sensitive site. The other major plasmin sensitive site is in the hydrophilic preturbance of the α-chain from the C-terminal node. Controlled plasmin degradation at these sites converts Fbg into fragment D and fragment E. The individual fragments are isolated by salt fractionation, gel filtration and ion exchange chromatography. The fragments are supplied lyophilized for storage at 4°C. Highly purified research grade fibrinogen (>95% clottable) is prepared by a combination of conventional and affinity techniques. It is supplied as a frozen solution in ctirate-phosphate for storage at -80°C.

品牌介绍

Haemtech生物制药服务(HBS)是一家领先的,符合cGMP要求的QC测试实验室,专门为生产重组和血浆衍生蛋白疗法的生物制药制造商提供分析服务,重点是那些会影响止血系统的药物。HBS使客户能够满足法规和质量测试要求,从而将其候选药物从开发转向商业化。

对生物制药的需求正在增长,并且该行业正在迅速采用外包策略,以作为满足不断升级的监管要求的一种方式。凭借在止血方面的丰富经验,HBS能够很好地协助开发影响凝血系统的药物产品。


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