OsHAP3H

OsHAP3H is a gene in Oryza sativa (rice) that encodes a subunit of the plant CCAAT-binding transcription factor known as NF-Y. In plants, NF-Y is a heterotrimeric complex that binds CCAAT promoter elements to regulate transcription of a wide range of genes involved in development, metabolism, and responses to environmental conditions. OsHAP3H is one member of the rice HAP3 family, which expands the regulatory potential of NF-Y signaling in monocots.

The protein encoded by OsHAP3H is predicted to be a nucleus-localized, DNA-binding subunit and is part of the HAP3 subfamily of NF-Y components. As with other HAP3 family members, OsHAP3H is expected to form part of a trimeric NF-Y complex by associating with NF-YA and NF-YC subunits, enabling recognition of promoter elements and modulation of transcription.

Expression data for OsHAP3H indicate that the gene is expressed in multiple tissues and can be influenced by developmental stage and environmental cues. In rice, members of the HAP3/NF-Y family often show tissue-specific and stress-responsive expression patterns, suggesting that OsHAP3H may participate in regulatory networks that integrate growth, development, and stress signals. However, precise targets and phenotypic consequences of OsHAP3H activity in rice require further experimental validation.

Overall, OsHAP3H is recognized as a rice NF-Y/HAP3 subunit with a likely role in transcriptional regulation through NF-Y complexes, contributing to the broader regulatory framework that coordinates rice development and environmental responses. See also NF-Y, HAP3, and the HAP family in plants.