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CHM
This gene encodes component A of the RAB geranylgeranyl transferase holoenzyme. In the dimeric holoenzyme, this subunit binds unprenylated Rab GTPases and then presents them to the catalytic Rab GGTase subunit for the geranylgeranyl transfer reaction. Rab GTPases need to be geranylgeranyled on either one or two cysteine residues in their C-terminus to localize to the correct intracellular membrane. Mutations in this gene are a cause of choroideremia; also known as tapetochoroidal dystrophy (TCD). This X-linked disease is characterized by progressive dystrophy of the choroid, retinal pigment epithelium and retina. Alternative splicing results in multiple transcript variants encoding different isoforms.
Protein class
Disease related genes, Human disease related genes
Predicted location
Intracellular
Single cell type specificity
Cell type enhanced (Inhibitory neurons)
Immune cell specificity
Low immune cell specificity
Cell line specificity
Low cell line specificity
Interaction
Monomer (By similarity). Heterotrimer composed of RABGGTA, RABGGTB and CHM; within this trimer, RABGGTA and RABGGTB form the catalytic component B, while CHM (component A) mediates Rab protein binding (PubMed:21905166). Can associate with the Rab GGTase dimer (RGGT or component B) prior to Rab protein binding; the association is stabilized by geranylgeranyl pyrophosphate (GGpp). The CHM:RGGT:Rab complex is destabilized by GGpp (PubMed:18532927). Interacts with RAB1A, RAB1B, RAB5A, RAB7A and RAB27A and mediates their prenylation (PubMed:7957092). Interacts with the non-phosphorylated forms of RAB3A, RAB3B, RAB3C, RAB3D, RAB5B, RAB5C, RAB8A, RAB8B, RAB10, RAB12, RAB35, and RAB43 (PubMed:26824392, PubMed:29125462).
Molecular function
GTPase activation
More Types Infomation
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- Derivation: Phage display library
- Species Reactivity: Human
- Type: Rabbit IgG
- Application: WB, ICC, FC
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For Research Use Only. Not For Clinical Use.