|
|
| Line 1: |
Line 1: |
| [[Image:2j2c.jpg|left|200px]] | | {{Seed}} |
| | [[Image:2j2c.png|left|200px]] |
|
| |
|
| <!-- | | <!-- |
| Line 9: |
Line 10: |
| {{STRUCTURE_2j2c| PDB=2j2c | SCENE= }} | | {{STRUCTURE_2j2c| PDB=2j2c | SCENE= }} |
|
| |
|
| '''CRYSTAL STRUCTURE OF HUMAN CYTOSOLIC 5'-NUCLEOTIDASE II (NT5C2, CN-II)'''
| | ===CRYSTAL STRUCTURE OF HUMAN CYTOSOLIC 5'-NUCLEOTIDASE II (NT5C2, CN-II)=== |
|
| |
|
|
| |
|
| ==Overview==
| | <!-- |
| Cytosolic 5'-nucleotidase II catalyzes the dephosphorylation of 6-hydroxypurine nucleoside 5'-monophosphates and regulates the IMP and GMP pools within the cell. It possesses phosphotransferase activity and thereby also catalyzes the reverse reaction. Both reactions are allosterically activated by adenine-based nucleotides and 2,3-bisphosphoglycerate. We have solved structures of cytosolic 5'-nucleotidase II as native protein (2.2 Angstrom) and in complex with adenosine (1.5 Angstrom) and beryllium trifluoride (2.15 Angstrom) The tetrameric enzyme is structurally similar to enzymes of the haloacid dehalogenase (HAD) superfamily, including mitochondrial 5'(3')-deoxyribonucleotidase and cytosolic 5'-nucleotidase III but possesses additional regulatory regions that contain two allosteric effector sites. At effector site 1 located near a subunit interface we modeled diadenosine tetraphosphate with one adenosine moiety in each subunit. This efficiently glues the tetramer subunits together in pairs. The model shows why diadenosine tetraphosphate but not diadenosine triphosphate activates the enzyme and supports a role for cN-II during apoptosis when the level of diadenosine tetraphosphate increases. We have also modeled 2,3-bisphosphoglycerate in effector site 1 using one phosphate site from each subunit. By comparing the structure of cytosolic 5'-nucleotidase II with that of mitochondrial 5'(3')-deoxyribonucleotidase in complex with dGMP, we identified residues involved in substrate recognition.
| | The line below this paragraph, {{ABSTRACT_PUBMED_17405878}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 17405878 is the PubMed ID number. |
| | --> |
| | {{ABSTRACT_PUBMED_17405878}} |
|
| |
|
| ==About this Structure== | | ==About this Structure== |
| Line 63: |
Line 67: |
| [[Category: Nt5c2]] | | [[Category: Nt5c2]] |
| [[Category: Polymorphism]] | | [[Category: Polymorphism]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 08:14:50 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 14:56:16 2008'' |