The most likely sub-cellular localization of NAC transcription factors is:
The most likely sub-cellular localization of NAC transcription factors is:
Select an option to attempt
Correct Answer: Option A
Explanation
NAC transcription factors in plants:NAC is one of the largest plant-specific transcription factor families (NAM-ATAF-CUC):• Name origin: No Apical Meristem (NAM), Arabidopsis Transcription Activator Factor 1/2 (ATAF1/2), Cup-Shaped Cotyledon 2 (CUC2)• ~117 members in Arabidopsis, >150 in rice.Structure: N-terminal NAC domain (DNA-binding + dimerisation) + C-terminal transcriptional activation/repression domain.Subcellular location: NUCLEUS (they are transcription factors that bind DNA and regulate gene expression).Functions:• Stress responses: drought (ANAC019, ANAC055), heat, cold stress• Leaf senescence: NAC transcription factors orchestrate senescence programme• Development: shoot apical meristem formation (CUC1, CUC2), wood formation• Pathogen responsesAnswer: NAC transcription factors are plant-specific, localise to the nucleus, and regulate stress, senescence, and developmental gene expression.