KEAP1 蛋白, Human (sf9)

KEAP1 in the BCR E3 ubiquitin ligase complex complex regulates cellular responses to oxidative stress by ubiquitinating NFE2L2/NRF2. As an oxidative stress sensor, KEAP1 normally promotes NFE2L2/NRF2 degradation. KEAP1 Protein, Human (sf9) is the recombinant human-derived KEAP1 protein, expressed by Sf9 insect cells , with tag free. The total length of KEAP1 Protein, Human (sf9) is 623 a.a..

KEAP1 作为 BCR (BTB-CUL3-RBX1) E3 泛素连接酶复合物内的底物特异性接头，通过协调 NFE2L2/NRF2 的泛素化来复杂地调节细胞对氧化应激的反应。作为氧化和亲电应激的重要传感器，KEAP1 在正常条件下促进 NFE2L2/NRF2 的泛素化和随后的降解，NFE2L2/NRF2 是许多细胞保护基因表达所必需的转录因子。当面临氧化应激时，不同的亲电子代谢物会诱导 KEAP1 中高反应性半胱氨酸残基发生非酶促共价修饰，从而有效抑制 BCR(KEAP1) 复合物的泛素连接酶活性。这种破坏促进 NFE2L2/NRF2 的核积累并触发 II 相解毒酶的表达。此外，选择性自噬通过与 SQSTM1/p62 的相互作用导致 KEAP1 被隔离在包涵体中，从而导致 BCR(KEAP1) 复合物失活和 NFE2L2/NRF2 激活。值得注意的是，BCR(KEAP1) 复合物将其泛素连接酶活性扩展到 SQSTM1/p62、BPTF 和 PGAM5 等底物，通过蛋白酶体调节它们的降解。BCR(KEAP1) 复合物的泛素连接酶活性因氧化应激和萝卜硫素等亲电代谢物而受到抑制，因为这些代谢物与 KEAP1 中的反应性半胱氨酸残基发生反应，导致非酶促共价修饰，从而使复合物丧失功能。此外，选择性自噬通过KEAP1和SQSTM1/p62之间的相互作用导致BCR(KEAP1)复合物失活，促进该复合物在包涵体中的隔离并促进其降解。

Measured by its ability to inhibit the proliferation of A549 cells. The ED₅₀ for this effect is 1.117-2.321 μg/mL.

Human

Sf9 insect cells

Tag Free

Q14145 (Q2-C624)

9817  [NCBI]

QPDPRPSGAGACCRFLPLQSQCPEGAGDAVMYASTECKAEVTPSQHGNRTFSYTLEDHTKQAFGIMNELRLSQQLCDVTLQVKYQDAPAAQFMAHKVVLASSSPVFKAMFTNGLREQGMEVVSIEGIHPKVMERLIEFAYTASISMGEKCVLHVMNGAVMYQIDSVVRACSDFLVQQLDPSNAIGIANFAEQIGCVELHQRAREYIYMHFGEVAKQEEFFNLSHCQLVTLISRDDLNVRCESEVFHACINWVKYDCEQRRFYVQALLRAVRCHSLTPNFLQMQLQKCEILQSDSRCKDYLVKIFEELTLHKPTQVMPCRAPKVGRLIYTAGGYFRQSLSYLEAYNPSDGTWLRLADLQVPRSGLAGCVVGGLLYAVGGRNNSPDGNTDSSALDCYNPMTNQWSPCAPMSVPRNRIGVGVIDGHIYAVGGSHGCIHHNSVERYEPERDEWHLVAPMLTRRIGVGVAVLNRLLYAVGGFDGTNRLNSAECYYPERNEWRMITAMNTIRSGAGVCVLHNCIYAAGGYDGQDQLNSVERYDVETETWTFVAPMKHRRSALGITVHQGRIYVLGGYDGHTFLDSVECYDPDTDTWSEVTRMTSGRSGVGVAVTMEPCRKQIDQQNCTC

Approximately 64-67 kDa

Greater than 85% as determined by reducing SDS-PAGE

无菌粉末

Lyophilized from a 0.2 μm filtered solution of 20 mM Tris, 500 mM NaCl, 3 mM DTT, 10% Glycerol, pH 7.4 or 50 mM Tris-HCL, 500 mM NaCl, pH 8.0, 20% Glycerol.

<1 EU/μg, determined by LAL method.

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH₂O. For long term storage it is recommended to add a carrier protein (0.1% BSA, 5% HSA, 10% FBS or 5% Trehalose).

Stored at -20°C for 2 years. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer (with carrier protein). It is recommended to freeze aliquots at -20°C or -80°C for extended storage.

Room temperature in continental US; may vary elsewhere.