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These proteins originated in green algae and expanded through multiple duplication events to help plants adapt to terrestrial life. Links to Hormone Networks
The Arabidopsis genome contains , categorized into four distinct families based on their structure and function: Key Functions HD-Zip I hormon.zip
HD-Zip proteins are unique to the plant kingdom and are characterized by a linked to a leucine zipper (LZ) motif. These proteins originated in green algae and expanded
HD-Zip proteins, particularly from the HD-Zip I family, regulate ABA homeostasis, which is vital for responding to abiotic stresses like drought and salinity. Some HD-Zip genes are regulated by ethylene and
Some HD-Zip genes are regulated by ethylene and methyl-jasmonic acid, signaling responses to biotic threats like insect herbivores. Functional Classification
These proteins act as specific transcription factors that coordinate plant growth, development, and environmental adaptation by linking directly to hormone signaling pathways.
The leucine zipper motif allows these proteins to form homodimers or heterodimers, which is essential for their function.