A GENERIC METHOD FOR EXPRESSION AND USE OF TAGGED SOLUBLE VERSIONS OF CELL-SURFACE RECEPTORS

被引:34
作者
WHITEHORN, EA [1 ]
TATE, E [1 ]
YANOFSKY, SD [1 ]
KOCHERSPERGER, L [1 ]
DAVIS, A [1 ]
MORTENSEN, RB [1 ]
YONKOVICH, S [1 ]
BELL, K [1 ]
DOWER, WJ [1 ]
BARRETT, RW [1 ]
机构
[1] AFFYMAX RES INST,PALO ALTO,CA 94304
来源
BIO-TECHNOLOGY | 1995年 / 13卷 / 11期
关键词
D O I
10.1038/nbt1195-1215
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
A general method for expression, purification, immobilization, detection and radiolabeling of extracellular domains (ECD) of type I membrane proteins. The type I interleukin-1 receptor (IL-1RtI), the alpha-subunit of interleukin-2 receptor (IL-2R alpha) and E-selectin are used as illustrative examples of cell surface receptors. DNA encoding the ECD of the proteins are fused at their 3' end to a chimeric DNA which serves to generically ''tag'' the recombinant ECD. The resulting fusion protein contains a substrate sequence for protein kinase-A (PKA) adjacent to the signal sequence from human placental alkaline phosphatase (HPAP). The HPAP signal sequence directs the formation of the phosphatidylinositol-glycan (PI-G) anchorage of the protein at the cell surface. When these chimeric genes are expressed in CHO cells, the ECDs are detected on the cell surface and can be released by treatment with phosphatidylinositol-specific phospholipase-C (PI-PLC). Based on protein processing known to occur for native HPAP, twenty amino acids from the HPAP signal sequence remain at the C-terminus of the ECD. A high affinity monoclonal antibody was generated against this common epitope. This antibody can be used to detect, purify and immobilize the ECDs. In addition, the ECDs can be radiolabeled with P-32 by treatment with PKA and maintain the ability to bind their natural ligands. This ''tagging'' method has been successfully applied to many other type I proteins which serve as cell surface receptors.
引用
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页码:1215 / 1219
页数:5
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