Journal Article

Molecular Cloning and Characterization of the cDNA for Discoidin II of <i>Dictyostelium discoideum</i>

Masashi Fukuzawa and Hiroshi Ochiai

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 37, issue 4, pages 505-514
Published in print June 1996 | ISSN: 0032-0781
e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a028973
Molecular Cloning and Characterization of the cDNA for Discoidin II of Dictyostelium discoideum

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By using monoclonal antibodies directed against discoidin II, we have isolated cDNA clones from axenically grown Ax-2 cells. On cDNA clone (D2) condtained a 1.2-k.b insert encoding the entire discoidin II protein, which is conposed of 257 amino acid residuces and has a calculated molecular mass of 28,574. The amino acid sequences, determined by Edman degradation of six tryptic peptides of discoidin II, were identical to those deduced from the cDNA sequences. The protein bears no resemblance to any proteins in the data banks, except that its sequence is 49% identical with the amino acid sequence of discoidin I. Discoidin II shares with discoidin I both a carbohydratebinding site and an Arg-Gly-Asp (RGD) sequence, which has been found in fibronectin in mammalian cells. With the onset of aggregation (8 h of development), a 1.3-kb discoidin II mRNA begins to accumulate. A similar pattern of regulation occurs at the protein level.

Keywords: cDNA; Cellular slime mold; Discoidin II; Lectin; Northern blot

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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