Abstract:
:The alpha-subunit of eukaryotic initiation factor eIF2 (eIF2alpha) plays an important role in the regulation of mRNA translation through modulation of the interaction of eIF2 and a second initiation factor, eIF2B. The interaction of the two proteins is regulated in vivo by phosphorylation of eIF2alpha at Ser51. In the present study, rat eIF2alpha was expressed in Sf21 cells using the baculovirus expression system. The recombinant protein was purified to >90% homogeneity in a single immunoaffinity chromatographic step. The protein was free of endogenous eIF2alpha kinase activity and was rapidly phosphorylated by the eIF2alpha kinases HCR and PKR. A variant of eIF2alpha in which the phosphorylation site was changed to Ala was also expressed and purified. The variant eIF2alpha was not phosphorylated by either HCR or PKR, demonstrating that the kinases specifically phosphorylate the correct site in the recombinant protein even in the absence of the other two subunits of the protein. In summary, a rapid and inexpensive method for obtaining eIF2alpha has been developed. Use of the wildtype and variant forms of eIF2alpha to measure eIF2alpha kinase activity in cell and tissue extracts should greatly facilitate examination of the regulation of mRNA translation under a variety of conditions.
journal_name
Protein Expr Purifjournal_title
Protein expression and purificationauthors
Kimball SR,Horetsky RL,Jagus R,Jefferson LSdoi
10.1006/prep.1998.0863subject
Has Abstractpub_date
1998-04-01 00:00:00pages
415-9issue
3eissn
1046-5928issn
1096-0279pii
S1046-5928(98)90863-4journal_volume
12pub_type
杂志文章abstract::We describe an efficient strategy to produce high-quality proteins by using a single large IMAC chromatography column and enzymatic His-tag removal via the TAGZyme system in pilot scale. Numerous quality assays demonstrated a high purity of the final product, the human cytokine Interleukin-1beta (IL-1beta). The protei...
journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
pub_type: 杂志文章,评审
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abstract::The complement regulatory protein (CRP) of Trypanosoma cruzi is a developmentally regulated glycosylphosphatidylinositol (GPI)-anchored membrane protein that protects the parasite from complement-mediated killing, and is an important virulence determinant of the microorganism. CRP binds human complement components C3b...
journal_title:Protein expression and purification
pub_type: 杂志文章
doi:10.1016/s1046-5928(02)00562-4
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journal_title:Protein expression and purification
pub_type: 杂志文章
doi:10.1006/prep.1999.1153
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journal_title:Protein expression and purification
pub_type: 杂志文章
doi:10.1016/j.pep.2006.12.017
更新日期:2007-06-01 00:00:00
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journal_title:Protein expression and purification
pub_type: 杂志文章
doi:10.1016/j.pep.2003.10.010
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journal_title:Protein expression and purification
pub_type: 杂志文章
doi:10.1016/j.pep.2009.06.021
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journal_title:Protein expression and purification
pub_type: 杂志文章
doi:10.1016/s1046-5928(03)00191-8
更新日期:2003-10-01 00:00:00
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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abstract::Soluble oligomers and fibrillar deposits of amyloid beta (Abeta) are key agents of Alzheimer's disease pathogenesis. However, the mechanism of amyloid aggregation and its interaction with live cells still remain unclear requiring the preparation of large amounts of pure and different Abeta peptides. Here we describe a...
journal_title:Protein expression and purification
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journal_title:Protein expression and purification
pub_type: 杂志文章
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abstract::The SaeRS two-component system in Staphylococcus aureus controls the expression of a series of virulence factors, such as hemolysins, proteases, and coagulase. The response regulator, SaeR, belongs to the OmpR family with an N-terminal regulatory domain and a C-terminal DNA binding domain. To improve the production an...
journal_title:Protein expression and purification
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journal_title:Protein expression and purification
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journal_title:Protein expression and purification
pub_type: 杂志文章
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journal_title:Protein expression and purification
pub_type: 杂志文章
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abstract::Lectins are a class of proteins with specific carbohydrate-binding properties found in a wide variety of plants and animals. Gramineae lectins are presumably defense-related proteins in plants that exert their effect by binding to N-acetylglucosamine. Barley lectin is a vacuolar protein synthesized with an amino-termi...
journal_title:Protein expression and purification
pub_type: 杂志文章
doi:10.1016/1046-5928(92)90068-8
更新日期:1992-12-01 00:00:00