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PubMed1990

Auxin binding proteins from maize coleoptiles: purification and molecular characterization.

To understand precisely the mechanisms by which hormones like auxins regulate plant differentiation and development, it is essential to isolate putative hormone receptors. We have purified the major auxin binding protein from maize coleoptiles to homogeneity. The protein has an apparent molecular weight of 22,000 Da and binds 1-naphthylacetic acid with a KD of 2.4 x 10(-7) M. Protein sequence analysis allowed the construction of oligonucleotide probes to isolate a corresponding cDNA coding for this protein. The open reading frame of this cDNA predicts a protein of 201 amino acids and 21,990 Da in size. The amino acid sequence includes a cleavable N-terminal signal sequence and a C-terminal signal element consisting of the amino acids Lys Asp Glu Leu known to be responsible for preventing secretion of proteins from the lumen of the endoplasmic reticulum.

Amino Acid Sequence↗
PubMed1998

Evidence for indole-3-acetic acid binding site in plant peroxidases. Structural similarity between peroxidases and auxin-binding proteins.

Application of computer methods allowed us to demonstrate that plant peroxidases and auxin-binding proteins contain structurally similar fragments. The mapping of the fragments was done using a model structure of horseradish peroxidase. Five of six structurally similar fragments belong to the distal domain and form a subdomain in plant peroxidases that includes the distal heme-coordinating sequence, LHFHDC (amino acid residues 39-44 in horseradish peroxidase). The existence of a substrate-binding site for indole-3-acetic acid in the distal subdomain comprising helices A (whole), B (middle), C (beginning), and D (whole) and the loop between helices D and D' is discussed.

Amino Acid Sequence↗