Publication Date:
2009-04-03
Description:
CRM1 (also known as XPO1 and exportin 1) mediates nuclear export of hundreds of proteins through the recognition of the leucine-rich nuclear export signal (LR-NES). Here we present the 2.9 A structure of CRM1 bound to snurportin 1 (SNUPN). Snurportin 1 binds CRM1 in a bipartite manner by means of an amino-terminal LR-NES and its nucleotide-binding domain. The LR-NES is a combined alpha-helical-extended structure that occupies a hydrophobic groove between two CRM1 outer helices. The LR-NES interface explains the consensus hydrophobic pattern, preference for intervening electronegative residues and inhibition by leptomycin B. The second nuclear export signal epitope is a basic surface on the snurportin 1 nucleotide-binding domain, which binds an acidic patch on CRM1 adjacent to the LR-NES site. Multipartite recognition of individually weak nuclear export signal epitopes may be common to CRM1 substrates, enhancing CRM1 binding beyond the generally low affinity LR-NES. Similar energetic construction is also used in multipartite nuclear localization signals to provide broad substrate specificity and rapid evolution in nuclear transport.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3437623/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3437623/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dong, Xiuhua -- Biswas, Anindita -- Suel, Katherine E -- Jackson, Laurie K -- Martinez, Rita -- Gu, Hongmei -- Chook, Yuh Min -- 5-T32-GM008297/GM/NIGMS NIH HHS/ -- R01 GM069909/GM/NIGMS NIH HHS/ -- R01GM069909/GM/NIGMS NIH HHS/ -- R01GM069909-03S1/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Apr 30;458(7242):1136-41. doi: 10.1038/nature07975. Epub 2009 Apr 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of Texas Southwestern Medical Center at Dallas, 6001 Forest Park, Dallas, Texas 75390-9041, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19339969" target="_blank"〉PubMed〈/a〉
Keywords:
Active Transport, Cell Nucleus
;
Crystallography, X-Ray
;
Epitopes
;
Fatty Acids, Unsaturated/pharmacology
;
Humans
;
Hydrophobic and Hydrophilic Interactions
;
Karyopherins/*chemistry/*metabolism
;
Leucine/*metabolism
;
Models, Molecular
;
Nuclear Export Signals/*physiology
;
Protein Binding/drug effects
;
Protein Conformation
;
Receptors, Cytoplasmic and Nuclear/*chemistry/*metabolism
;
Structure-Activity Relationship
;
Substrate Specificity
;
snRNP Core Proteins/chemistry/metabolism
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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