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2fwr

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[[Image:2fwr.gif|left|200px]]
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{{Seed}}
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[[Image:2fwr.png|left|200px]]
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{{STRUCTURE_2fwr| PDB=2fwr | SCENE= }}
{{STRUCTURE_2fwr| PDB=2fwr | SCENE= }}
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'''Structure of Archaeoglobus Fulgidis XPB'''
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===Structure of Archaeoglobus Fulgidis XPB===
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==Overview==
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The human xeroderma pigmentosum group B (XPB) helicase is essential for transcription, nucleotide excision repair, and TFIIH functional assembly. Here, we determined crystal structures of an Archaeoglobus fulgidus XPB homolog (AfXPB) that characterize two RecA-like XPB helicase domains and discover a DNA damage recognition domain (DRD), a unique RED motif, a flexible thumb motif (ThM), and implied conformational changes within a conserved functional core. RED motif mutations dramatically reduce helicase activity, and the DRD and ThM, which flank the RED motif, appear structurally as well as functionally analogous to the MutS mismatch recognition and DNA polymerase thumb domains. Substrate specificity is altered by DNA damage, such that AfXPB unwinds dsDNA with 3' extensions, but not blunt-ended dsDNA, unless it contains a lesion, as shown for CPD or (6-4) photoproducts. Together, these results provide an unexpected mechanism of DNA unwinding with implications for XPB damage verification in nucleotide excision repair.
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The line below this paragraph, {{ABSTRACT_PUBMED_16600867}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 16600867 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16600867}}
==About this Structure==
==About this Structure==
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[[Category: Dna unwinding]]
[[Category: Dna unwinding]]
[[Category: Xpb]]
[[Category: Xpb]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 04:23:50 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 04:50:33 2008''

Revision as of 01:50, 29 July 2008

Image:2fwr.png

Template:STRUCTURE 2fwr

Structure of Archaeoglobus Fulgidis XPB

Template:ABSTRACT PUBMED 16600867

About this Structure

2FWR is a Single protein structure of sequence from Archaeoglobus fulgidus. Full crystallographic information is available from OCA.

Reference

Conserved XPB core structure and motifs for DNA unwinding: implications for pathway selection of transcription or excision repair., Fan L, Arvai AS, Cooper PK, Iwai S, Hanaoka F, Tainer JA, Mol Cell. 2006 Apr 7;22(1):27-37. PMID:16600867

Page seeded by OCA on Tue Jul 29 04:50:33 2008

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