PURIFICATION AND CHARACTERIZATION OF AN AUXIN-BINDING PROTEIN FROM ARABIDOPSIS-THALIANA EXPRESSED IN BACULOVIRUS-INFECTED INSECT CELLS

被引:11
作者
MASSOTTE, D [1 ]
FLEIG, U [1 ]
PALME, K [1 ]
机构
[1] MAX PLANCK INST ZUCHTUNGSFORSCH,D-50829 COLOGNE,GERMANY
关键词
D O I
10.1006/prep.1995.1028
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
The auxin-binding protein At-ERabpl is of very low abundance in Arabidopsis thaliana; it hinders any study at the protein level as it is difficult to collect large amounts from the plant. We therefore chose to express At-ERabpl in baculovirus-infected insect cells. Recombinant baculoviruses were selected in yeast according to Patel et al. (Nucleic Acids Res. 20, 97-104, 1991). The recombinant protein was purified to homogeneity by a simple procedure involving an affinity step on a succinyl-concanavalin A column, Labeling with the photoactive auxin 5-N-3-[7-H-3]indole-3-acetic acid demonstrated that the baculovirus-expressed protein belongs to the auxin-binding protein family as deduced from its cDNA homology to a gene previously characterized in maize. The mature polypeptide migrates on SDS-PAGE with an apparent molecular mass of about 23 kDa, its NH2-leader sequence is properly processed, and it bears a high-mannose-type sugar moiety, All results are in agreement with information derived from the cDNA analysis. The possible role of a functional dimerization is also discussed. (C) 1995 Academic Press, Inc.
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页码:220 / 227
页数:8
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