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. 1989 Sep;8(9):2463–2467. doi: 10.1002/j.1460-2075.1989.tb08381.x

cDNA clones of the auxin-binding protein from corn coleoptiles (Zea mays L.): isolation and characterization by immunological methods.

U Tillmann 1, G Viola 1, B Kayser 1, G Siemeister 1, T Hesse 1, K Palme 1, M Löbler 1, D Klämbt 1
PMCID: PMC401232  PMID: 2555180

Abstract

An auxin-binding protein (ABP) cDNA clone was selected from a lambda gt11 cDNA library from corn coleoptiles with highly purified IgGanti ABP. The sequence of 794 bp contains an open reading frame (ORF) of 603 bp, coding for a 22 kd protein. There are indications of a signal peptide of 38 amino acids (von Heijne, G. 1983, Eur. J. Biochem., 133, 17-21). A N-glycosylation site can be deduced and a C-terminal KDEL amino acid sequence is detected. An EcoRI fragment containing the beginning portion of the cDNA with about three quarters of the ORF was used to select cDNA clones from an independently produced lambda gt11 cDNA library of corn coleoptiles. Northern blot analysis with in vitro transcribed biotinylated RNA showed a single band of not more than 850 bases. The full-length in vitro transcript directed the in vitro synthesis of a protein which is precipitated by IgGanti ABP. Rabbit antibodies raised against a fusion protein detect the ABP as a double band on Western blots. Only the smaller of the two ABP bands is labeled by two different KDEL-specific IgG preparations.

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