Biology:KIFAP3

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Kinesin-associated protein 3 is a protein that in humans is encoded by the KIFAP3 (also known as KAP3) gene.[1][2] It is a non-motor, accessory subunit which co-oligomerizes with the motor subunits KIF3A and KIF3B or KIF3C, to form heterotrimeric kinesin-2 motor proteins. Kinesin-2 KAP subunits were initially characterized in echinoderms and mice.[3][4]

Function

The small G protein GDP dissociation stimulator (smg GDS) is a regulator protein having two activities on a group of small G proteins including the Rho and Rap1 family members and Ki-Ras; one is to stimulate their GDP/GTP exchange reactions, and the other is to inhibit their interactions with membranes. The protein encoded by this gene contains 9 Armadillo repeats and interacts with the smg GDS protein through these repeats. This protein, which is highly concentrated around the endoplasmic reticulum, is phosphorylated by v-src, and this phosphorylation reduces the affinity of the protein for smg GDS. It is thought that this protein serves as a linker between human chromosome-associated polypeptide (HCAP) and KIF3A/B, a kinesin superfamily protein in the nucleus, and that it plays a role in the interaction of chromosomes with an ATPase motor protein.[2]

Interactions

KIFAP3 has been shown to interact with APC,[5] SMC3[6] and RAP1GDS1.[1]

References

  1. 1.0 1.1 "SMAP, an Smg GDS-associating protein having arm repeats and phosphorylated by Src tyrosine kinase". J Biol Chem 271 (43): 27013–7. Dec 1996. doi:10.1074/jbc.271.43.27013. PMID 8900189. 
  2. 2.0 2.1 "Entrez Gene: KIFAP3 kinesin-associated protein 3". https://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=22920. 
  3. "Sequence and submolecular localization of the 115-kD accessory subunit of the heterotrimeric kinesin-II (KRP85/95) complex". J. Cell Biol. 132 (3): 371–80. February 1996. doi:10.1083/jcb.132.3.371. PMID 8636215. 
  4. "Cloning and characterization of KAP3: a novel kinesin superfamily-associated protein of KIF3A/3B". Proc. Natl. Acad. Sci. U.S.A. 93 (16): 8443–8. August 1996. doi:10.1073/pnas.93.16.8443. PMID 8710890. Bibcode1996PNAS...93.8443Y. 
  5. "Identification of a link between the tumour suppressor APC and the kinesin superfamily". Nat. Cell Biol. 4 (4): 323–7. April 2002. doi:10.1038/ncb779. PMID 11912492. 
  6. "Complex formation of SMAP/KAP3, a KIF3A/B ATPase motor-associated protein, with a human chromosome-associated polypeptide". J. Biol. Chem. 273 (12): 6591–4. March 1998. doi:10.1074/jbc.273.12.6591. PMID 9506951. 

Further reading