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Senescence domain This is the AAA ATPase senescence domain (SC) found at the C-terminal of plant senescence-associated proteins and spartin. In Hemerocallis, petals a genetically based program that leads to senescence and cell death approximately 24 hours after the flower opens, and it is believed that senescence proteins produced around that time have a role in this program. This domain is also present at the C-terminal of Spartin, a protein from higher vertebrates associated with mitochondrial membranes and transportation along microtubules. Spartin functions presynaptically with endocytic adaptor Eps15 to regulate synaptic growth and function. Mutations in human spartin gene cause Troyer syndrome, a hereditary spastic paraplegia. This AAA ATPase domain, similar to other AAA proteins contain an alpha/beta nucleotide-binding domain (NBD) and a smaller four-helix bundle domain (HBD). Uniquely among AAA structures, spastin has two helices (N-terminal alpha1 and C-terminal alpha11) hat embrace the NBD. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",