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| - | [[Image:1okb.jpg|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_1okb| PDB=1okb | SCENE= }} | | {{STRUCTURE_1okb| PDB=1okb | SCENE= }} |
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| - | '''CRYSTAL STRUCTURE OF URACIL-DNA GLYCOSYLASE FROM ATLANTIC COD (GADUS MORHUA)'''
| + | ===CRYSTAL STRUCTURE OF URACIL-DNA GLYCOSYLASE FROM ATLANTIC COD (GADUS MORHUA)=== |
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| - | ==Overview==
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| - | Uracil-DNA glycosylase (UDG; EC 3.2.2.3) is a DNA-repair protein that catalyses the hydrolysis of promutagenic uracil residues from single- or double-stranded DNA, generating free uracil and abasic DNA. The crystal structure of the catalytic domain of cod uracil-DNA glycosylase (cUDG) has been determined to 1.9 A resolution, with final R factors of 18.61 and 20.57% for the working and test sets of reflections, respectively. This is the first crystal structure of a uracil-DNA glycosylase from a cold-adapted species and a detailed comparison with the human enzyme is performed in order to rationalize the cold-adapted behaviour of the cod enzyme at the structural level. The catalytic domain of cUDG comprises 223 residues, with a sequence identity to the human UDG of 75%. The tertiary structures of the two enzymes are also similar, with an overall displacement in main-chain atomic positions of 0.63 A. The amino-acid substitutions and the differences in intramolecular hydrogen bonds, hydrophobic interactions, ion-pair interactions and electrostatic potentials are compared and discussed in order to gain insight into the factors that cause the increased activity and reduced thermostability of the cod enzyme. In particular, the reduced number of strong ion-pair interactions in the C-terminal half of cUDG is believed to greatly affect the flexibility and/or stability. Increased positive electrostatic surface potential on the DNA-facing side of cUDG seems to be responsible for increasing the affinity for the negatively charged DNA compared with that of hUDG.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_12876336}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 12876336 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_12876336}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Structure-function relationship]] | | [[Category: Structure-function relationship]] |
| | [[Category: Uracil-dna glycosylase]] | | [[Category: Uracil-dna glycosylase]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 03:57:31 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 22:57:17 2008'' |
Revision as of 19:57, 28 July 2008
Template:STRUCTURE 1okb
CRYSTAL STRUCTURE OF URACIL-DNA GLYCOSYLASE FROM ATLANTIC COD (GADUS MORHUA)
Template:ABSTRACT PUBMED 12876336
About this Structure
1OKB is a Single protein structure of sequence from Gadus morhua. Full crystallographic information is available from OCA.
Reference
The structure of uracil-DNA glycosylase from Atlantic cod (Gadus morhua) reveals cold-adaptation features., Leiros I, Moe E, Lanes O, Smalas AO, Willassen NP, Acta Crystallogr D Biol Crystallogr. 2003 Aug;59(Pt 8):1357-65. Epub 2003, Jul 23. PMID:12876336
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