Group:MUZIC:DARP: Difference between revisions
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== Structure == | == Structure == | ||
DARP contains putative nuclear localization signals,four tandem ankyrin-like repeats, potential coiled-coil dimerization motif within its unique aminoterminal domain that mediates the formation of homodimers. <ref name='three'>PMID 16450059</ref>The amino acid sequence of DARP showed high similarity to cardiac ankyrin-repeat protein (CARP) and ankyrin-repeat domain 2 (Ankrd2) with 45 and 36% identities, respectively | DARP contains putative nuclear localization signals,four tandem ankyrin-like repeats, potential coiled-coil dimerization motif within its unique aminoterminal domain that mediates the formation of homodimers. <ref name='three'>PMID 16450059</ref>The amino acid sequence of DARP showed high similarity to cardiac ankyrin-repeat protein (CARP) and ankyrin-repeat domain 2 (Ankrd2) with 45 and 36% identities, respectively | ||
[[Image:DARP.png|center|800px|thumb|Domain architecture and modification sites of '''DARP''']] | [[Image:DARP.png|center|800px|thumb|Domain architecture and modification sites of '''DARP''']] | ||
== Gene Function == | == Gene Function == | ||
DARP knock out muscle fibers were less stiff, tended to have longer resting sarcomere lengths, and expressed a longer isoform of titin than their wild-type counterparts, indicating that this protein may play a role in the passive mechanical behavior of muscle. <ref name='four'>PMID 17392382 </ref> DARP expression is altered by a change of energy supply and energy metabolic condition, induced by excess fatty acid treatment in vitro and fasting in vivo. <ref name='two'>PMID 12456686 </ref> The expression of DARP is induced during recovery following starvation. | DARP knock out muscle fibers were less stiff, tended to have longer resting sarcomere lengths, and expressed a longer isoform of titin than their wild-type counterparts, indicating that this protein may play a role in the passive mechanical behavior of muscle. <ref name='four'>PMID 17392382 </ref> DARP expression is altered by a change of energy supply and energy metabolic condition, induced by excess fatty acid treatment in vitro and fasting in vivo. <ref name='two'>PMID 12456686 </ref> The expression of DARP is induced during recovery following starvation. | ||
== Interaction == | |||
.DARP interacts with a tyrosine-rich binding motif between Ig80 and Ig81 of titin and with myopalladin. <ref name='one'>PMID 14583192</ref> | |||
In cultured fetal rat cardiac myocytes, passive stretch induced differential distribution patterns of DARP: staining for DARP was increased in the nucleus, at the I-band region of myofibrils and also at intercalated discs. <ref name='one'>PMID 14583192</ref> | In cultured fetal rat cardiac myocytes, passive stretch induced differential distribution patterns of DARP: staining for DARP was increased in the nucleus, at the I-band region of myofibrils and also at intercalated discs. <ref name='one'>PMID 14583192</ref> | ||
Differently from its homolog genes, DARP is not upregulated after ECs.<ref name='five'>PMID 14561590 </ref> | Differently from its homolog genes, DARP is not upregulated after ECs.<ref name='five'>PMID 14561590 </ref> | ||
Revision as of 17:34, 27 September 2012
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| 1n0r, resolution 1.50Å () | |||||||||
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| Ligands: | |||||||||
| Related: | 1n0q | ||||||||
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||
Introduction
Diabetes related ankyrin repeat protein DARP (Ankrd23) and its two close homologs Ankrd2/Arpp and Ankrd1/CARP correspond to a conserved gene family of muscle ankyrin repeat proteins (MARPs). [1] DARP is expressed in both heart and skeletal muscle (in addition to brown fat) and was identified by its upregulation in Type 2 diabetes and insulin-resistant animals, suggesting a potential role in energy metabolism. [2]
StructureStructure
DARP contains putative nuclear localization signals,four tandem ankyrin-like repeats, potential coiled-coil dimerization motif within its unique aminoterminal domain that mediates the formation of homodimers. [3]The amino acid sequence of DARP showed high similarity to cardiac ankyrin-repeat protein (CARP) and ankyrin-repeat domain 2 (Ankrd2) with 45 and 36% identities, respectively
Gene FunctionGene Function
DARP knock out muscle fibers were less stiff, tended to have longer resting sarcomere lengths, and expressed a longer isoform of titin than their wild-type counterparts, indicating that this protein may play a role in the passive mechanical behavior of muscle. [4] DARP expression is altered by a change of energy supply and energy metabolic condition, induced by excess fatty acid treatment in vitro and fasting in vivo. [2] The expression of DARP is induced during recovery following starvation.
InteractionInteraction
.DARP interacts with a tyrosine-rich binding motif between Ig80 and Ig81 of titin and with myopalladin. [1]
In cultured fetal rat cardiac myocytes, passive stretch induced differential distribution patterns of DARP: staining for DARP was increased in the nucleus, at the I-band region of myofibrils and also at intercalated discs. [1]
Differently from its homolog genes, DARP is not upregulated after ECs.[5]
RefrencesRefrences
- ↑ 1.0 1.1 1.2 Miller MK, Bang ML, Witt CC, Labeit D, Trombitas C, Watanabe K, Granzier H, McElhinny AS, Gregorio CC, Labeit S. The muscle ankyrin repeat proteins: CARP, ankrd2/Arpp and DARP as a family of titin filament-based stress response molecules. J Mol Biol. 2003 Nov 7;333(5):951-64. PMID:14583192
- ↑ 2.0 2.1 Ikeda K, Emoto N, Matsuo M, Yokoyama M. Molecular identification and characterization of a novel nuclear protein whose expression is up-regulated in insulin-resistant animals. J Biol Chem. 2003 Feb 7;278(6):3514-20. Epub 2002 Nov 26. PMID:12456686 doi:10.1074/jbc.M204563200
- ↑ Witt SH, Labeit D, Granzier H, Labeit S, Witt CC. Dimerization of the cardiac ankyrin protein CARP: implications for MARP titin-based signaling. J Muscle Res Cell Motil. 2005;26(6-8):401-8. PMID:16450059 doi:10.1007/s10974-005-9022-9
- ↑ Barash IA, Bang ML, Mathew L, Greaser ML, Chen J, Lieber RL. Structural and regulatory roles of muscle ankyrin repeat protein family in skeletal muscle. Am J Physiol Cell Physiol. 2007 Jul;293(1):C218-27. Epub 2007 Mar 28. PMID:17392382 doi:10.1152/ajpcell.00055.2007
- ↑ Barash IA, Mathew L, Ryan AF, Chen J, Lieber RL. Rapid muscle-specific gene expression changes after a single bout of eccentric contractions in the mouse. Am J Physiol Cell Physiol. 2004 Feb;286(2):C355-64. Epub 2003 Oct 15. PMID:14561590 doi:10.1152/ajpcell.00211.2003