| Structural highlights
Function
RBTN2_MOUSE Acts with TAL1/SCL to regulate red blood cell development. Also acts with LDB1 to maintain erythroid precursors in an immature state.[1] LDB1_MOUSE Binds to the LIM domain of a wide variety of LIM domain-containing transcription factors. May regulate the transcriptional activity of LIM-containing proteins by determining specific partner interactions. May play a role in the development of motor neurons. Acts synergistically with LHX1/LIM1 in axis formation and activation of gene expression. Acts with LMO2 in the regulation of red blood cell development, maintaining erythroid precursors in an immature state.[2] [3] [4] [5] [6] [7]
Publication Abstract from PubMed
LIM-only protein 2, Lmo2, is a regulatory protein that is essential for hematopoietic development and inappropriate overexpression of Lmo2 in T cells contributes to T cell leukaemia. It exerts its functions by mediating protein-protein interactions and nucleating multicomponent transcriptional complexes. Lmo2 interacts with LIM domain binding protein 1 (Ldb1) through the tandem LIM domains of Lmo2 and the LIM interaction domain (LID) of Ldb1. Here we present the solution structure of the LIM2 domain of Lmo2 bound to Ldb1(LID) . The ordered regions of Ldb1 in this complex correspond well with binding hotspots previously defined by mutagenic studies. Comparisons of this Lmo2(LIM2) -Ldb1(LID) structure with previously determined structures of the Lmo2/Ldb1(LID) complexes lead to the conclusion that modular binding of tandem LIM domains in Lmo2 to tandem linear motifs in Ldb1 is accompanied by several disorder-to-order transitions and/or conformational changes in both proteins. Proteins 2012. (c) 2012 The Protein Society.
Solution structure of a tethered Lmo2(LIM2) /Ldb1(LID) complex.,Dastmalchi S, Wilkinson-White L, Kwan AH, Gamsjaeger R, Mackay JP, Matthews JM Protein Sci. 2012 Aug 30. doi: 10.1002/pro.2153. PMID:22936624[8]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Visvader JE, Mao X, Fujiwara Y, Hahm K, Orkin SH. The LIM-domain binding protein Ldb1 and its partner LMO2 act as negative regulators of erythroid differentiation. Proc Natl Acad Sci U S A. 1997 Dec 9;94(25):13707-12. PMID:9391090
- ↑ Agulnick AD, Taira M, Breen JJ, Tanaka T, Dawid IB, Westphal H. Interactions of the LIM-domain-binding factor Ldb1 with LIM homeodomain proteins. Nature. 1996 Nov 21;384(6606):270-2. PMID:8918878 doi:http://dx.doi.org/10.1038/384270a0
- ↑ Jurata LW, Kenny DA, Gill GN. Nuclear LIM interactor, a rhombotin and LIM homeodomain interacting protein, is expressed early in neuronal development. Proc Natl Acad Sci U S A. 1996 Oct 15;93(21):11693-8. PMID:8876198
- ↑ Bach I, Carriere C, Ostendorff HP, Andersen B, Rosenfeld MG. A family of LIM domain-associated cofactors confer transcriptional synergism between LIM and Otx homeodomain proteins. Genes Dev. 1997 Jun 1;11(11):1370-80. PMID:9192866
- ↑ Visvader JE, Mao X, Fujiwara Y, Hahm K, Orkin SH. The LIM-domain binding protein Ldb1 and its partner LMO2 act as negative regulators of erythroid differentiation. Proc Natl Acad Sci U S A. 1997 Dec 9;94(25):13707-12. PMID:9391090
- ↑ Tran YH, Xu Z, Kato A, Mistry AC, Goya Y, Taira M, Brandt SJ, Hirose S. Spliced isoforms of LIM-domain-binding protein (CLIM/NLI/Ldb) lacking the LIM-interaction domain. J Biochem. 2006 Jul;140(1):105-19. Epub 2006 Jun 30. PMID:16815859 doi:http://dx.doi.org/10.1093/jb/mvj134
- ↑ Jurata LW, Gill GN. Functional analysis of the nuclear LIM domain interactor NLI. Mol Cell Biol. 1997 Oct;17(10):5688-98. PMID:9315627
- ↑ Dastmalchi S, Wilkinson-White L, Kwan AH, Gamsjaeger R, Mackay JP, Matthews JM. Solution structure of a tethered Lmo2(LIM2) /Ldb1(LID) complex. Protein Sci. 2012 Aug 30. doi: 10.1002/pro.2153. PMID:22936624 doi:http://dx.doi.org/10.1002/pro.2153
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