1yme
From Proteopedia
(New page: 200px<br /><applet load="1yme" size="450" color="white" frame="true" align="right" spinBox="true" caption="1yme, resolution 1.53Å" /> '''STRUCTURE OF CARBOXY...) |
|||
| Line 1: | Line 1: | ||
| - | [[Image:1yme.jpg|left|200px]]<br /><applet load="1yme" size=" | + | [[Image:1yme.jpg|left|200px]]<br /><applet load="1yme" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1yme, resolution 1.53Å" /> | caption="1yme, resolution 1.53Å" /> | ||
'''STRUCTURE OF CARBOXYPEPTIDASE'''<br /> | '''STRUCTURE OF CARBOXYPEPTIDASE'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The crystal structure of the zinc-containing exopeptidase bovine | + | The crystal structure of the zinc-containing exopeptidase bovine carboxypeptidase A (CPA) has been refined to high resolution, based on a data set collected from a single crystal, incorporating new sequence information based on cloning of the bovine gene. In addition, new refined structures are available for the zinc-removed form of the enzyme, apo-CPA, as well as the mercury-replaced form, Hg-CPA. The native structure reveals that the zinc-bound water molecule does not appear to more loosely bound than the rest of the zinc ligands, at least when B-factor values are considered. Nor is there any evidence for a secondary location of this water molecule. The apo-enzyme structure does not show any density in the place of the removed zinc ion. The only significant change appears to be a chi2 rotation of one zinc histidine ligand to form an ion-pair interaction with a glutamic acid side chain. The structure of Hg-CPA reveals a solvent Tris molecule bound to the mercury cation, as well as an unidentified cation bound to Glu270. The location of this citation agrees with previous proposals for the binding side of inhibitory zinc. These observations may explain some of the differences in kinetics observed in metal- replaced CPA. |
==About this Structure== | ==About this Structure== | ||
| - | 1YME is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with ZN as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Carboxypeptidase_A Carboxypeptidase A], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.17.1 3.4.17.1] Full crystallographic information is available from [http:// | + | 1YME is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with <scene name='pdbligand=ZN:'>ZN</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Carboxypeptidase_A Carboxypeptidase A], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.17.1 3.4.17.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YME OCA]. |
==Reference== | ==Reference== | ||
| Line 14: | Line 14: | ||
[[Category: Carboxypeptidase A]] | [[Category: Carboxypeptidase A]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Greenblatt, H | + | [[Category: Greenblatt, H M.]] |
[[Category: Shoham, G.]] | [[Category: Shoham, G.]] | ||
| - | [[Category: Tucker, P | + | [[Category: Tucker, P A.]] |
[[Category: ZN]] | [[Category: ZN]] | ||
[[Category: carboxypeptidase]] | [[Category: carboxypeptidase]] | ||
| Line 22: | Line 22: | ||
[[Category: metalloproteinase]] | [[Category: metalloproteinase]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:06:52 2008'' |
Revision as of 14:06, 21 February 2008
|
STRUCTURE OF CARBOXYPEPTIDASE
Overview
The crystal structure of the zinc-containing exopeptidase bovine carboxypeptidase A (CPA) has been refined to high resolution, based on a data set collected from a single crystal, incorporating new sequence information based on cloning of the bovine gene. In addition, new refined structures are available for the zinc-removed form of the enzyme, apo-CPA, as well as the mercury-replaced form, Hg-CPA. The native structure reveals that the zinc-bound water molecule does not appear to more loosely bound than the rest of the zinc ligands, at least when B-factor values are considered. Nor is there any evidence for a secondary location of this water molecule. The apo-enzyme structure does not show any density in the place of the removed zinc ion. The only significant change appears to be a chi2 rotation of one zinc histidine ligand to form an ion-pair interaction with a glutamic acid side chain. The structure of Hg-CPA reveals a solvent Tris molecule bound to the mercury cation, as well as an unidentified cation bound to Glu270. The location of this citation agrees with previous proposals for the binding side of inhibitory zinc. These observations may explain some of the differences in kinetics observed in metal- replaced CPA.
About this Structure
1YME is a Single protein structure of sequence from Bos taurus with as ligand. Active as Carboxypeptidase A, with EC number 3.4.17.1 Full crystallographic information is available from OCA.
Reference
Carboxypeptidase A: native, zinc-removed and mercury-replaced forms., Greenblatt HM, Feinberg H, Tucker PA, Shoham G, Acta Crystallogr D Biol Crystallogr. 1998 May 1;54(Pt 3):289-305. PMID:9867434
Page seeded by OCA on Thu Feb 21 16:06:52 2008
