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PLANT PHYSIOLOGY , Vol 104, Issue 2 793-796, Copyright © 1994 by American Society of Plant Biologists

RAPID COMMUNICATIONS

Isolation and Characterization of Three Soybean Extensin cDNAs

J. C. Hong, Y. H. Cheong, R. T. Nagao, J. D. Bahk, M. J. Cho and J. L. Key
Plant Molecular Biology and Biotechnology Research Center and Department of Biochemistry, Gyeongsang National University, Chinju, 660-701, Korea (J.C.H., Y.H.C., J.D.B., M.J.C.)

We have characterized three different soybean (Glycine max) mRNAs that encode apoproteins of extensins, a family of cell wall hydroxyproline-rich glycoproteins (HRGPs). These transcripts encoded distinctive Tyr-rich proteins containing characteristic Ser-Pro4 sequences organized in higher-order repetitive units. The first transcript encoded an extensin SbHRGP-1 containing the 16-amino acid repeat Ser-Pro4-Ser-Pro-Ser-Pro4-Tyr-Val-Tyr-Lys, with Val occasionally replaced by Ile or Tyr. The second transcript encoded the SbHRGP-2 protein containing the 16-amino acid repeat Ser-Pro4-Ser-Pro-Ser-Pro4-Tyr-Tyr-Tyr-Lys/His. The third transript encoded the SbHRGP-3 protein containing a variant of 9- or 10-amino acid canonical repeats: Ser-Pro4-Tyr-Lys-Tyr-Pro, Ser-Pro5-Tyr-Lys-Tyr-Pro, and Ser-Pro4-Val-Tyr-Lys-Tyr-Lys, respectively. The dramatic amino acid substitutions in the Tyr-rich blocks (Tyr-X-Tyr-Lys) among these HRGPs indicate that each SbHRGP may have a different function in cell wall architecture.


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J. Hoon Ahn, Y. Choi, S.-G. Kim, Y. Myung Kwon, Y. Do Choi, and J. Seob Lee
Expression of a Soybean Hydroxyproline-Rich Glycoprotein Gene Is Correlated with Maturation of Roots
Plant Physiology, February 1, 1998; 116(2): 671 - 679.
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Copyright © 1994 by the American Society of Plant Biologists