Plant Cell Journal of Pharmacology and Experimental Therapeutics
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The Plant Cell, Vol. 13, 2297-2317, October 2001, Copyright © 2001,
American Society of Plant Biologists

Genomics Analysis of Genes Expressed in Maize Endosperm Identifies Novel Seed Proteins and Clarifies Patterns of Zein Gene Expression

Young-Min Wooa, David Wang-Nan Hub, Brian A. Larkins1,a and Rudolf Jungb

a Department of Plant Sciences, University of Arizona, Tucson, Arizona 85721
b Pioneer Hi-Bred International, 7300 NW 62nd Avenue, P.O. Box 1004, Johnston, Iowa 50131-1004

1 To whom correspondence should be addressed. E-mail larkins{at}ag.arizona.edu; fax 520-621-3692

We analyzed cDNA libraries from developing endosperm of the B73 maize inbred line to evaluate the expression of storage protein genes. This study showed that zeins are by far the most highly expressed genes in the endosperm, but we found an inverse relationship between the number of zein genes and the relative amount of specific mRNAs. Although {alpha}-zeins are encoded by large multigene families, only a few of these genes are transcribed at high or detectable levels. In contrast, relatively small gene families encode the {gamma}- and {delta}-zeins, and members of these gene families, especially the {gamma}-zeins, are highly expressed. Knowledge of expressed storage protein genes allowed the development of DNA and antibody probes that distinguish between closely related gene family members. Using in situ hybridization, we found differences in the temporal and spatial expression of the {alpha}-, {gamma}-, and {delta}-zein gene families, which provides evidence that {gamma}-zeins are synthesized throughout the endosperm before {alpha}- and {delta}-zeins. This observation is consistent with earlier studies that suggested that {gamma}-zeins play an important role in prolamin protein body assembly. Analysis of endosperm cDNAs also revealed several previously unidentified proteins, including a 50-kD {gamma}-zein, an 18-kD {alpha}-globulin, and a legumin-related protein. Immunolocalization of the 50-kD {gamma}-zein showed this protein to be located at the surface of prolamin-containing protein bodies, similar to other {gamma}-zeins. The 18-kD {alpha}-globulin, however, is deposited in novel, vacuole-like organelles that were not described previously in maize endosperm.




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