HAP4 — Oryza sativa Indica Group

Summary

BGIOSGA033382 (symbol HAP4, also known as OiHAP4) on chromosome 10 of Indica rice encodes a ubiquitin-like domain-containing protein. It is annotated with the molecular functions protein tag, structural constituent of the ribosome, and mRNA binding. The gene is associated with protein ubiquitination, modification-dependent proteolysis, translation, DNA integration, DNA replication, and DNA metabolism. Its product localizes to the cytoplasm, nucleus, ribosome, cytosolic ribosome, and ribonucleoprotein complexes. HAP4 is linked to grain shape, grain weight, grain yield, and cold tolerance. Studies of related genes in other species, such as RUB1, RUB2, and RUB3, connect this gene family to protein modification processes, though these associations are not yet established for HAP4 itself.