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GrainGenes Reference Report: PLC-14-599

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Reference	PLC-14-599
Title	Establishment of cereal endosperm expression domains: Identification and properties of a maize transfer cell-specific transcription factor, ZmMRP-1
Journal	Plant Cell
Year	2002
Volume	14
Pages	599-610
Author	Gomez E Royo J Guo Y Thompson R Hueros G
Abstract	Summary: In maize, cells at the base of the endosperm are transformed into transfer cells that facilitate nutrient uptake by the developing seed. ZmMRP-1 is the first transfer cell-specific transcriptional activator to be identified. The protein it encodes contains nuclear localization signals and a MYB-related DNA binding domain. A single gene copy is present in maize, mapping to a locus on chromosome 8. ZmMRP-1 is first expressed soon after fertilization, when the endosperm is still a multinuclear coenocyte. The transcript accumulates in the basal nucleocytoplasmic domain that gives rise to transfer cells after cellularization. The transcript can be detected throughout transfer cell development, but it is not found in mature cells. ZmMRP-1 strongly transactivates the promoters of two unrelated transfer cell-specific genes. The properties of ZmMRP-1 are consistent with it being a determinant of transfer cell-specific expression. Possible roles for ZmMRP-1 in the regulation of endosperm and transfer cell differentiation are discussed
External Databases	Pubmed: 11910007
Keyword	[ Hide all but 1 of 55 ] 50 activator barley endosperm binding domain caryopses cell cell differentiation cell-specific expression cereal endosperm chromosome copies determinant differentiation dna dna binding dna binding protein domain embryogenesis encode endosperm establishment fertilization gene localization localization signal locus maize mapping nuclear localization nuclear localization signals nuclear-localization nutrient nutrient uptake nutrient-uptake opaque-2 encodes promoter promoters properties protein protoplast regulation roles seed signal single-gene transcript transcription transcription factor transcriptional activator transfer transfer cell transfer cells transformation uptake zea mays

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