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Translation of Some Maize Small Heat Shock Proteins Is Initiated From Internal In-Frame AUGs
J. Roger H. Frappiera, David B. Waldenb, and Burr G. Atkinsonaa Molecular Genetics Unit, Western Science Centre, Departments of Zoology, University of Western Ontario, London, Ontario, Canada N6A 5B7
b Plant Sciences, University of Western Ontario, London, Ontario, Canada N6A 5B7
Corresponding author: David B. Walden, Molecular Genetics Unit, Department of Plant Sciences, University of Western Ontario, London, ON, N6A 5B7 Canada, dwalden{at}julian.uwo.ca (E-mail).
Communicating editor: K. J. NEWTON
18 kD) that is composed of at least 12 members. We previously described the cDNA-derived sequence of three maize shsp mRNAs (cMHSP18-1, cMHSP18-3, and cMHSP18-9). In this report, we demonstrate that the mRNA transcribed in vitro from one of these cDNAs (cMHSP 18-9) is responsible for the synthesis of three members of the shsp family, and we suggest that cMHSP18-3 may be responsible for the synthesis of three additional members and cMHSP18-1 for the synthesis of two other members of this family. The fact that these genes do not contain introns, coupled with the observations reported herein, suggest that maize may have established another method of using a single gene to produce a number of different proteins.