| Structural highlights
Function
[RD23A_HUMAN] Multiubiquitin chain receptor involved in modulation of proteasomal degradation. Binds to 'Lys-48'-linked polyubiquitin chains in a length-dependent manner and with a lower affinity to 'Lys-63'-linked polyubiquitin chains. Proposed to be capable to bind simultaneously to the 26S proteasome and to polyubiquitinated substrates and to deliver ubiquitinated proteins to the proteasome.[1] [2] [3] [4] [5] Involved in nucleotide excision repair and is thought to be functional equivalent for RAD23B in global genome nucleotide excision repair (GG-NER) by association with XPC. In vitro, the XPC:RAD23A dimer has NER activity. Can stabilize XPC.[6] [7] [8] [9] [10] Involved in vpr-dependent replication of HIV-1 in non-proliferating cells and primary macrophages. Required for the association of HIV-1 vpr with the host proteasome.[11] [12] [13] [14] [15]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Rad23 proteins are involved both in the ubiquitin-proteasome pathway and in nucleotide excision repair (NER), but the relationship between these two pathways is not yet understood. The two human homologs of Rad23, hHR23A and B, are functionally redundant in NER and interact with xeroderma pigmentosum complementation group C (XPC) protein. The XPC-hHR23 complex is responsible for the specific recognition of damaged DNA, which is an early step in NER. The interaction of the XPC binding domain (XPCB) of hHR23A/B with XPC protein has been shown to be important for its optimal function in NER. We have determined the solution structure of XPCB of hHR23A. The domain consists of five amphipathic helices and reveals hydrophobic patches on the otherwise highly hydrophilic domain surface. The patches are predicted to be involved in interaction with XPC. The XPCB domain has limited sequence homology with any proteins outside of the Rad23 family except for sacsin, a protein involved in spastic ataxia of Charlevoix-Saguenay, which contains a domain with 35% sequence identity.
Structure of the XPC binding domain of hHR23A reveals hydrophobic patches for protein interaction.,Kamionka M, Feigon J Protein Sci. 2004 Sep;13(9):2370-7. PMID:15322280[16]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Sugasawa K, Ng JM, Masutani C, Maekawa T, Uchida A, van der Spek PJ, Eker AP, Rademakers S, Visser C, Aboussekhra A, Wood RD, Hanaoka F, Bootsma D, Hoeijmakers JH. Two human homologs of Rad23 are functionally interchangeable in complex formation and stimulation of XPC repair activity. Mol Cell Biol. 1997 Dec;17(12):6924-31. PMID:9372924
- ↑ Wang Q, Goh AM, Howley PM, Walters KJ. Ubiquitin recognition by the DNA repair protein hHR23a. Biochemistry. 2003 Nov 25;42(46):13529-35. PMID:14621999 doi:10.1021/bi035391j
- ↑ Raasi S, Pickart CM. Rad23 ubiquitin-associated domains (UBA) inhibit 26 S proteasome-catalyzed proteolysis by sequestering lysine 48-linked polyubiquitin chains. J Biol Chem. 2003 Mar 14;278(11):8951-9. PMID:12643283
- ↑ Raasi S, Orlov I, Fleming KG, Pickart CM. Binding of polyubiquitin chains to ubiquitin-associated (UBA) domains of HHR23A. J Mol Biol. 2004 Aug 27;341(5):1367-79. PMID:15321727 doi:10.1016/j.jmb.2004.06.057
- ↑ Li G, Elder RT, Dubrovsky L, Liang D, Pushkarsky T, Chiu K, Fan T, Sire J, Bukrinsky M, Zhao RY. HIV-1 replication through hHR23A-mediated interaction of Vpr with 26S proteasome. PLoS One. 2010 Jun 29;5(6):e11371. doi: 10.1371/journal.pone.0011371. PMID:20614012 doi:10.1371/journal.pone.0011371
- ↑ Sugasawa K, Ng JM, Masutani C, Maekawa T, Uchida A, van der Spek PJ, Eker AP, Rademakers S, Visser C, Aboussekhra A, Wood RD, Hanaoka F, Bootsma D, Hoeijmakers JH. Two human homologs of Rad23 are functionally interchangeable in complex formation and stimulation of XPC repair activity. Mol Cell Biol. 1997 Dec;17(12):6924-31. PMID:9372924
- ↑ Wang Q, Goh AM, Howley PM, Walters KJ. Ubiquitin recognition by the DNA repair protein hHR23a. Biochemistry. 2003 Nov 25;42(46):13529-35. PMID:14621999 doi:10.1021/bi035391j
- ↑ Raasi S, Pickart CM. Rad23 ubiquitin-associated domains (UBA) inhibit 26 S proteasome-catalyzed proteolysis by sequestering lysine 48-linked polyubiquitin chains. J Biol Chem. 2003 Mar 14;278(11):8951-9. PMID:12643283
- ↑ Raasi S, Orlov I, Fleming KG, Pickart CM. Binding of polyubiquitin chains to ubiquitin-associated (UBA) domains of HHR23A. J Mol Biol. 2004 Aug 27;341(5):1367-79. PMID:15321727 doi:10.1016/j.jmb.2004.06.057
- ↑ Li G, Elder RT, Dubrovsky L, Liang D, Pushkarsky T, Chiu K, Fan T, Sire J, Bukrinsky M, Zhao RY. HIV-1 replication through hHR23A-mediated interaction of Vpr with 26S proteasome. PLoS One. 2010 Jun 29;5(6):e11371. doi: 10.1371/journal.pone.0011371. PMID:20614012 doi:10.1371/journal.pone.0011371
- ↑ Sugasawa K, Ng JM, Masutani C, Maekawa T, Uchida A, van der Spek PJ, Eker AP, Rademakers S, Visser C, Aboussekhra A, Wood RD, Hanaoka F, Bootsma D, Hoeijmakers JH. Two human homologs of Rad23 are functionally interchangeable in complex formation and stimulation of XPC repair activity. Mol Cell Biol. 1997 Dec;17(12):6924-31. PMID:9372924
- ↑ Wang Q, Goh AM, Howley PM, Walters KJ. Ubiquitin recognition by the DNA repair protein hHR23a. Biochemistry. 2003 Nov 25;42(46):13529-35. PMID:14621999 doi:10.1021/bi035391j
- ↑ Raasi S, Pickart CM. Rad23 ubiquitin-associated domains (UBA) inhibit 26 S proteasome-catalyzed proteolysis by sequestering lysine 48-linked polyubiquitin chains. J Biol Chem. 2003 Mar 14;278(11):8951-9. PMID:12643283
- ↑ Raasi S, Orlov I, Fleming KG, Pickart CM. Binding of polyubiquitin chains to ubiquitin-associated (UBA) domains of HHR23A. J Mol Biol. 2004 Aug 27;341(5):1367-79. PMID:15321727 doi:10.1016/j.jmb.2004.06.057
- ↑ Li G, Elder RT, Dubrovsky L, Liang D, Pushkarsky T, Chiu K, Fan T, Sire J, Bukrinsky M, Zhao RY. HIV-1 replication through hHR23A-mediated interaction of Vpr with 26S proteasome. PLoS One. 2010 Jun 29;5(6):e11371. doi: 10.1371/journal.pone.0011371. PMID:20614012 doi:10.1371/journal.pone.0011371
- ↑ Kamionka M, Feigon J. Structure of the XPC binding domain of hHR23A reveals hydrophobic patches for protein interaction. Protein Sci. 2004 Sep;13(9):2370-7. PMID:15322280 doi:10.1110/ps.04824304
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