J. Harry C. Hoge

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Cells of Catharanthus roseus (L.) G. Don were genetically engineered to over-express the enzymes strictosidine synthase (STR; EC 4.3.3.2) and tryptophan decarboxylase (TDC; EC 4.1.1.28), which catalyze key steps in the biosynthesis of terpenoid indole alkaloids (TIAs). The cultures established after Agrobacterium-mediated transformation showed wide(More)
Catharanthus roseus (periwinkle) produces a wide range of terpenoid indole alkaloids, including several pharmaceutically important compounds, from the intermediate strictosidine. The complete mRNA sequence for the enzyme strictosidine synthase (SSS) was determined. Comparison of the primary structure of the encoded protein with the amino-terminal sequence(More)
A tobacco cDNA clone (pCNT1) was characterized that encodes an extensin apoprotein almost entirely composed of the repeats Ser-Pro4(-Lys2), Pro-Tyr2-Pro2-His and Thr-Pro-Val-Tyr-Lys. In healthy plants extensin transcripts are abundant in the roots, less prevalent in the stem and rare in the leaves. In leaves extensin mRNA is induced by wounding, ethylene or(More)
Tobacco shoots exposed to elevated endogenous or exogenous cytokinin levels are unable to develop roots and lack apical dominance. We have isolated cDNA copies of five mRNA species that accumulate to elevated levels in such cytokinin-stressed shoots via differential screening of a cDNA library of transgenic shoots which contain an active T-DNA cytokinin(More)
The vascular tissues of plants form a network of interconnected cell files throughout the plant body. The transition from a genetically totipotent meristematic precursor to different stages of a committed procambial cell, and its subsequent differentiation into a mature vascular element, involves developmental events whose molecular nature is still mostly(More)
In previous studies we have identified several mRNAs which accumulate after addition of 2,4-dichlorophenoxyacetic-acid (2,4-D) to auxin-starved tobacco cells [45, 46]. The mRNAs corresponding to cDNA clone pCNT103 were found to accumulate transiently prior to the cell division response due to auxin treatment. In this study we determined the sequences of(More)
This paper describes the characterization of Oshox1, a cDNA clone from rice encoding a member of the homeodomain-leucine zipper (HD-Zip) class of putative transcription factors. Oshox1 maps to chromosome 10 and belongs to a family of related rice genes. Two-hybrid assays showed that Oshox1 protein can homodimerize, but can also form heterodimers with an(More)
Proteins of the closely related homeodomain-leucine zipper (HD-Zip) families I and II in plants are putative transcription factors that interact with similar pseudopalindromic DNA recognition sites. We have previously described the Oshox1 gene from rice, which encodes an HD-Zip II protein. To identify further rice HD-Zip proteins, one-hybrid screens were(More)
We describe the construction of a number of vectors that can be used in yeast genetic selection systems for cloning of transcription factors or other DNA-binding proteins and for identification of the target sites recognized by transcription factors. For transcription factor cloning we have designed an integration vector with two HIS3 reporter gene(More)
The AT hook is an AT-rich DNA-binding domain that occurs three times in mammalian high-mobility-group I/Y chromosomal proteins and has recently also been identified in DNA-binding proteins from plants. We unexpectedly isolated three rice cDNA clones encoding AT hook-containing proteins in an attempt to isolate homeobox cDNA clones by south-western screening(More)