2od3

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[[Image:2od3.gif|left|200px]]
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{{STRUCTURE_2od3| PDB=2od3 | SCENE= }}
{{STRUCTURE_2od3| PDB=2od3 | SCENE= }}
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'''Human thrombin chimera with human residues 184a, 186, 186a, 186b, 186c and 222 replaced by murine thrombin equivalents.'''
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===Human thrombin chimera with human residues 184a, 186, 186a, 186b, 186c and 222 replaced by murine thrombin equivalents.===
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==Overview==
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Unlike human thrombin, murine thrombin lacks Na+ activation due to the charge reversal substitution D222K in the Na+ binding loop. However, the enzyme is functionally stabilized in a Na+-bound form and is highly active toward physiologic substrates. The structural basis of this peculiar property is unknown. Here, we present the 2.2 A resolution x-ray crystal structure of murine thrombin in the absence of inhibitors and salts. The enzyme assumes an active conformation, with Ser-195, Glu-192, and Asp-189 oriented as in the Na+-bound fast form of human thrombin. Lys-222 completely occludes the pore of entry to the Na+ binding site and positions its side chain inside the pore, with the Nzeta atom H-bonded to the backbone oxygen atoms of Lys-185, Asp-186b, and Lys-186d. The same architecture is observed in the 1.75 A resolution structure of a thrombin chimera in which the human enzyme carries all residues defining the Na+ pore in the murine enzyme. These findings demonstrate that Na+ activation in thrombin is linked to the architecture of the Na+ pore. The molecular strategy of Na+ activation mimicry unraveled for murine thrombin is relevant to serine proteases and enzymes activated by monovalent cations in general.
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(as it appears on PubMed at http://www.pubmed.gov), where 17428793 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17428793}}
==Disease==
==Disease==
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[[Category: Mathews, F S.]]
[[Category: Mathews, F S.]]
[[Category: Serine protease]]
[[Category: Serine protease]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 10:38:53 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 05:14:18 2008''

Revision as of 02:14, 29 July 2008

Image:2od3.png

Template:STRUCTURE 2od3

Contents

Human thrombin chimera with human residues 184a, 186, 186a, 186b, 186c and 222 replaced by murine thrombin equivalents.

Template:ABSTRACT PUBMED 17428793

Disease

Known disease associated with this structure: Dysprothrombinemia OMIM:[176930], Hyperprothrombinemia OMIM:[176930], Hypoprothrombinemia OMIM:[176930]

About this Structure

2OD3 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structural basis of Na+ activation mimicry in murine thrombin., Marino F, Chen ZW, Ergenekan CE, Bush-Pelc LA, Mathews FS, Di Cera E, J Biol Chem. 2007 Jun 1;282(22):16355-61. Epub 2007 Apr 10. PMID:17428793

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