ARID domain

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PDB 1ig6 EBI.jpg
human mrf-2 domain, nmr, 11 structures
Symbol ARID
Pfam PF01388
InterPro IPR001606
SCOP 1ig6

In molecular biology, the ARID domain (AT-rich interaction domain; also known as BRIGHT domain))[1] is a protein domain that binds to DNA. ARID domain-containing proteins are found in fungi , plants [2] and invertebrate and vertebrate metazoans. ARID-encoding genes are involved in a variety of biological processes including embryonic development, cell lineage gene regulation and cell cycle control. Although the specific roles of this domain and of ARID-containing proteins in transcriptional regulation are yet to be elucidated, they include both positive and negative transcriptional regulation and a likely involvement in the modification of chromatin structure.[3] The basic structure of the ARID domain appears to be a series of six alpha-helices separated by beta-strands, loops, or turns, but the structured region may extend to an additional helix at either or both ends of the basic six. Based on primary sequence homology, they can be partitioned into three structural classes: Minimal ARID proteins that consist of a core domain formed by six alpha helices; ARID proteins that supplement the core domain with an N-terminal alpha-helix; and Extended-ARID proteins, which contain the core domain and additional alpha-helices at their N- and C-termini.

The human SWI-SNF complex protein p270 is an ARID family member with non-sequence-specific DNA binding activity. The ARID consensus and other structural features are common to both p270 and yeast SWI1, suggesting that p270 is a human counterpart of SWI1.[4] The approximately 100-residue ARID sequence is present in a series of proteins strongly implicated in the regulation of cell growth, development, and tissue-specific gene expression. Although about a dozen ARID proteins can be identified from database searches, to date, only Bright (a regulator of B-cell-specific gene expression), dead ringer (a Drosophila melanogaster gene product required for normal development), and MRF-2 (which represses expression from the Cytomegalovirus enhancer) have been analyzed directly with regard to their DNA binding properties. Each binds preferentially to AT-rich sites. In contrast, p270 shows no sequence preference in its DNA binding activity, thereby demonstrating that AT-rich binding is not an intrinsic property of ARID domains and that ARID family proteins may be involved in a wider range of DNA interactions.[4]


  1. ^ Herrscher RF, Kaplan MH, Lelsz DL, Das C, Scheuermann R, Tucker PW (1995). "The immunoglobulin heavy-chain matrix-associating regions are bound by Bright: a B cell-specific trans-activator that describes a new DNA-binding protein family.". Genes Dev. 9 (24): 3067–82. doi:10.1101/gad.9.24.3067. PMID 8543152. 
  2. ^ Zheng B, He H, Zheng Y, Wu W, McCormick S (2014) An ARID Domain-Containing Protein within Nuclear Bodies Is Required for Sperm Cell Formation in Arabidopsis thaliana. PLoS Genet 10(7): e1004421. doi: 10.1371/journal.pgen.1004421
  3. ^ Kortschak RD, Tucker PW, Saint R (June 2000). "ARID proteins come in from the desert". Trends Biochem. Sci. 25 (6): 294–9. doi:10.1016/S0968-0004(00)01597-8. PMID 10838570. 
  4. ^ a b Dallas PB, Pacchione S, Wilsker D, Bowrin V, Kobayashi R, Moran E (May 2000). "The human SWI-SNF complex protein p270 is an ARID family member with non-sequence-specific DNA binding activity". Mol. Cell. Biol. 20 (9): 3137–46. doi:10.1128/MCB.20.9.3137-3146.2000. PMC 85608Freely accessible. PMID 10757798. 

This article incorporates text from the public domain Pfam and InterPro IPR001606