1m5i
From Proteopedia
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==Overview== | ==Overview== | ||
| - | The APC (adenomatous polyposis coli) tumor suppressor protein has many | + | The APC (adenomatous polyposis coli) tumor suppressor protein has many different intracellular functions including a nuclear export activity. Only little is known about the molecular architecture of the 2843-amino acid APC protein. Guided by secondary structure predictions we identified a fragment close to the N-terminal end, termed APC-(129-250), as a soluble and protease-resistant domain. We solved the crystal structure of APC-(129-250), which is monomeric and consists of three alpha-helices forming two separate antiparallel coiled coils. APC-(129-250) includes the nuclear export signal NES-(165-174) at the C-terminal end of the first helix. Surprisingly, the conserved hydrophobic amino acids of NES-(165-174) are buried in one of the coiled coils and are thus not accessible for interaction with other proteins. We demonstrate the direct interaction of APC-(129-250) with the nuclear export factor chromosome maintenance region 1 (Crm-1). This interaction is enhanced by the small GTPase Ran in its activated GTP-bound form and also by a double mutation in APC-(129-250), which deletes two amino acids forming two of the major interhelical interactions within the coiled coil. These observations hint to a regulatory mechanism of the APC nuclear export activity by NES masking. |
==Disease== | ==Disease== | ||
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[[Category: Mueller, O.]] | [[Category: Mueller, O.]] | ||
[[Category: Tickenbrock, L.]] | [[Category: Tickenbrock, L.]] | ||
| - | [[Category: Vetter, I | + | [[Category: Vetter, I R.]] |
[[Category: coiled-coil]] | [[Category: coiled-coil]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:51:46 2008'' |
Revision as of 11:51, 21 February 2008
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Crystal Structure of the coiled coil region 129-250 of the tumor suppressor gene product APC
Contents |
Overview
The APC (adenomatous polyposis coli) tumor suppressor protein has many different intracellular functions including a nuclear export activity. Only little is known about the molecular architecture of the 2843-amino acid APC protein. Guided by secondary structure predictions we identified a fragment close to the N-terminal end, termed APC-(129-250), as a soluble and protease-resistant domain. We solved the crystal structure of APC-(129-250), which is monomeric and consists of three alpha-helices forming two separate antiparallel coiled coils. APC-(129-250) includes the nuclear export signal NES-(165-174) at the C-terminal end of the first helix. Surprisingly, the conserved hydrophobic amino acids of NES-(165-174) are buried in one of the coiled coils and are thus not accessible for interaction with other proteins. We demonstrate the direct interaction of APC-(129-250) with the nuclear export factor chromosome maintenance region 1 (Crm-1). This interaction is enhanced by the small GTPase Ran in its activated GTP-bound form and also by a double mutation in APC-(129-250), which deletes two amino acids forming two of the major interhelical interactions within the coiled coil. These observations hint to a regulatory mechanism of the APC nuclear export activity by NES masking.
Disease
Known diseases associated with this structure: Adenoma, periampullary OMIM:[611731], Adenomatous polyposis coli OMIM:[611731], Brain tumor-polyposis syndrome 2 OMIM:[611731], Colorectal cancer, somatic OMIM:[611731], Desmoid disease, hereditary OMIM:[611731], Gardner syndrome OMIM:[611731], Gastric cancer, somatic OMIM:[611731], Hepatoblastoma OMIM:[611731]
About this Structure
1M5I is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
The coiled coil region (amino acids 129-250) of the tumor suppressor protein adenomatous polyposis coli (APC). Its structure and its interaction with chromosome maintenance region 1 (Crm-1)., Tickenbrock L, Cramer J, Vetter IR, Muller O, J Biol Chem. 2002 Aug 30;277(35):32332-8. Epub 2002 Jun 17. PMID:12070164
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