| Structural highlights
Disease
[TRI18_HUMAN] Defects in MID1 are the cause of Opitz GBBB syndrome 1 (OGS1) [MIM:300000]. A congenital midline malformation syndrome characterized by hypertelorism, genital-urinary defects such as hypospadias in males and splayed labia in females, lip-palate-laryngotracheal clefts, imperforate anus, developmental delay and congenital heart defects. Note=MID1 mutations produce proteins with a decreased affinity for microtubules.[1] [2] [3] [4]
Function
[TRI18_HUMAN] Has E3 ubiquitin ligase activity towards IGBP1, promoting its monoubiquitination, which results in deprotection of the catalytic subunit of protein phosphatase PP2A, and its subsequent degradation by polyubiquitination.[5] [6] [7]
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
The B-box type 2 domain is a prominent feature of a large and growing family of RING, B-box, coiled-coil (RBCC) domain-containing proteins and is also present in more than 1500 additional proteins. Most proteins usually contain a single B-box2 domain, although some proteins contain tandem domains consisting of both type 1 and type 2 B-boxes, which actually share little sequence similarity. Recently, we determined the solution structure of B-box1 from MID1, a putative E3 ubiquitin ligase that is mutated in X-linked Opitz G/BBB syndrome, and showed that it adopted a betabetaalpha RING-like fold. Here, we report the tertiary structure of the B-box2 (CHC(D/C)C(2)H(2)) domain from MID1 using multidimensional NMR spectroscopy. This MID1 B-box2 domain consists of a short alpha-helix and a structured loop with two short anti-parallel beta-strands and adopts a tertiary structure similar to the B-box1 and RING structures, even though there is minimal primary sequence similarity between these domains. By mutagenesis, ESI-FTICR and ICP mass spectrometry, we show that the B-box2 domain coordinates two zinc atoms with a 'cross-brace' pattern: one by Cys175, His178, Cys195 and Cys198 and the other by Cys187, Asp190, His204, and His207. Interestingly, this is the first case that an aspartic acid is involved in zinc atom coordination in a zinc-finger domain, although aspartic acid has been shown to coordinate non-catalytic zinc in matrix metalloproteinases. In addition, the finding of a Cys195Phe substitution identified in a patient with X-linked Opitz GBBB syndrome supports the importance of proper zinc coordination for the function of the MID1 B-box2 domain. Notably, however, our structure differs from the only other published B-box2 structure, that from XNF7, which was shown to coordinate one zinc atom. Finally, the similarity in tertiary structures of the B-box2, B-box1 and RING domains suggests these domains have evolved from a common ancestor.
Solution structure of the MID1 B-box2 CHC(D/C)C(2)H(2) zinc-binding domain: insights into an evolutionarily conserved RING fold.,Massiah MA, Matts JA, Short KM, Simmons BN, Singireddy S, Yi Z, Cox TC J Mol Biol. 2007 May 25;369(1):1-10. Epub 2007 Mar 15. PMID:17428496[8]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Quaderi NA, Schweiger S, Gaudenz K, Franco B, Rugarli EI, Berger W, Feldman GJ, Volta M, Andolfi G, Gilgenkrantz S, Marion RW, Hennekam RC, Opitz JM, Muenke M, Ropers HH, Ballabio A. Opitz G/BBB syndrome, a defect of midline development, is due to mutations in a new RING finger gene on Xp22. Nat Genet. 1997 Nov;17(3):285-91. PMID:9354791 doi:10.1038/ng1197-285
- ↑ Cox TC, Allen LR, Cox LL, Hopwood B, Goodwin B, Haan E, Suthers GK. New mutations in MID1 provide support for loss of function as the cause of X-linked Opitz syndrome. Hum Mol Genet. 2000 Oct 12;9(17):2553-62. PMID:11030761
- ↑ Gaudenz K, Roessler E, Quaderi N, Franco B, Feldman G, Gasser DL, Wittwer B, Horst J, Montini E, Opitz JM, Ballabio A, Muenke M. Opitz G/BBB syndrome in Xp22: mutations in the MID1 gene cluster in the carboxy-terminal domain. Am J Hum Genet. 1998 Sep;63(3):703-10. PMID:9718340
- ↑ So J, Suckow V, Kijas Z, Kalscheuer V, Moser B, Winter J, Baars M, Firth H, Lunt P, Hamel B, Meinecke P, Moraine C, Odent S, Schinzel A, van der Smagt JJ, Devriendt K, Albrecht B, Gillessen-Kaesbach G, van der Burgt I, Petrij F, Faivre L, McGaughran J, McKenzie F, Opitz JM, Cox T, Schweiger S. Mild phenotypes in a series of patients with Opitz GBBB syndrome with MID1 mutations. Am J Med Genet A. 2005 Jan 1;132A(1):1-7. PMID:15558842 doi:10.1002/ajmg.a.30407
- ↑ Cainarca S, Messali S, Ballabio A, Meroni G. Functional characterization of the Opitz syndrome gene product (midin): evidence for homodimerization and association with microtubules throughout the cell cycle. Hum Mol Genet. 1999 Aug;8(8):1387-96. PMID:10400985
- ↑ Trockenbacher A, Suckow V, Foerster J, Winter J, Krauss S, Ropers HH, Schneider R, Schweiger S. MID1, mutated in Opitz syndrome, encodes an ubiquitin ligase that targets phosphatase 2A for degradation. Nat Genet. 2001 Nov;29(3):287-94. PMID:11685209 doi:10.1038/ng762
- ↑ Watkins GR, Wang N, Mazalouskas MD, Gomez RJ, Guthrie CR, Kraemer BC, Schweiger S, Spiller BW, Wadzinski BE. Monoubiquitination promotes calpain cleavage of the protein phosphatase 2A (PP2A) regulatory subunit alpha4, altering PP2A stability and microtubule-associated protein phosphorylation. J Biol Chem. 2012 Jul 13;287(29):24207-15. doi: 10.1074/jbc.M112.368613. Epub, 2012 May 21. PMID:22613722 doi:10.1074/jbc.M112.368613
- ↑ Massiah MA, Matts JA, Short KM, Simmons BN, Singireddy S, Yi Z, Cox TC. Solution structure of the MID1 B-box2 CHC(D/C)C(2)H(2) zinc-binding domain: insights into an evolutionarily conserved RING fold. J Mol Biol. 2007 May 25;369(1):1-10. Epub 2007 Mar 15. PMID:17428496 doi:10.1016/j.jmb.2007.03.017
|
