Potential guanine nucleotide exchange factor (GEF). GEF proteins activate some small GTPases by exchanging bound GDP for free GTP. Defects in DOCK8 are the cause of hyperimmunoglobulin E recurrent infection syndrome autosomal recessive (AR-HIES). It is a rare disorder of immunity characterized by immunodeficiency, recurrent infections, eczema, increased serum IgE, eosinophilia and lack of connective tissue and skeletal involvement. Defects in DOCK8 are the cause of mental retardation autosomal dominant type 2 (MRD2). Mental retardation is characterized by significantly below average general intellectual functioning associated with impairments in adaptative behavior and manifested during the developmental period. A chromosomal aberration disrupting DOCK8 has been found in a patient with mental retardation and ectodermal dysplasia. DOCK8 is disrupted in patients with mental retardation. A balanced translocation, t(X;9) (q13.1;p24). Belongs to the DOCK family. 3 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: GEFs, misc.; Motility/polarity/chemotaxis; GEFs
Chromosomal Location of Human Ortholog: 9p24.3
Cellular Component: membrane; leading edge; cytosol
Molecular Function: protein binding; guanyl-nucleotide exchange factor activity
Biological Process: formation of immunological synapse; small GTPase mediated signal transduction; blood coagulation; positive regulation of GTPase activity
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.