功能Rate limiting enzyme in the de novo synthesis of guanine nucleotides and therefore is involved in the regulation of cell growth. It may also have a role in the development of malignancy and the growth progression of some tumors.
组织特异性IMP type I is the main species in normal leukocytes and type II predominates over type I in the tumor.
通路Purine metabolism; XMP biosynthesis via de novo pathway; XMP from IMP: step 1/1.
疾病相关Defects in IMPDH1 are the cause of retinitis pigmentosa type 10 (RP10) [MIM:180105]. RP leads to degeneration of retinal photoreceptor cells. Patients typically have night vision blindness and loss of midperipheral visual field. As their condition progresses, they lose their far peripheral visual field and eventually central vision as well. RP10 inheritance is autosomal dominant.
序列相似性Belongs to the IMPDH/GMPR family. Contains 2 CBS domains.