View source for 1a7c

[[Image:1a7c.gif|left|200px]]

 {{Structure
|PDB= 1a7c |SIZE=350|CAPTION= <scene name='initialview01'>1a7c</scene>, resolution 1.95&Aring;
|SITE= <scene name='pdbsite=NUL:Glycosylation+Sites'>NUL</scene>
|LIGAND= <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>
|ACTIVITY= 
|GENE= 
}}

'''HUMAN PLASMINOGEN ACTIVATOR INHIBITOR TYPE-1 IN COMPLEX WITH A PENTAPEPTIDE'''


==Overview==
BACKGROUND: Plasminogen activator inhibitor type 1 (PAI-1) is an important endogenous regulator of the fibrinolytic system. Reduction of PAI-1 activity has been shown to enhance dissolution of blood clots. Like other serpins, PAI-1 binds covalently to a target serine protease, thereby irreversibly inactivating the enzyme. During this process the exposed reactive-centre loop of PAI-1 is believed to undergo a conformational change becoming inserted into beta sheet A of the serpin. Incubation with peptides from the reactive-centre loop transform serpins into a substrate for their target protease. It has been hypothesised that these peptides bind to beta sheet A, thereby hindering the conformational rearrangement leading to loop insertion and formation of the stable serpin-protease complex. RESULTS: We report here the 1.95 A X-ray crystal structure of a complex of a glycosylated mutant of PAI-1, PAI-1-ala335Glu, with two molecules of the inhibitory reactive-centre loop peptide N-Ac-TVASS-NH2. Both bound peptide molecules are located between beta strands 3A and 5A of the serpin. The binding kinetics of the peptide inhibitor to immobilised PAI-1-Ala335Glu, as monitored by surface plasmon resonance, is consistent with there being two different binding sites. CONCLUSIONS: This is the first reported crystal structure of a complex formed between a serpin and a serpin inhibitor. The localisation of the inhibitory peptide in the complex strongly supports the theory that molecules binding in the space between beta strands 3A and 5A of a serpin are able to prevent insertion of the reactive-centre loop into beta sheet A, thereby abolishing the ability of the serpin to irreversibly inactivate its target enzyme. The characterisation of the two binding sites for the peptide inhibitor provides a solid foundation for computer-aided design of novel, low molecular weight PAI-1 inhibitors.

==Disease==
Known diseases associated with this structure: Hemorrhagic diathesis due to PAI1 deficiency OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=173360 173360]], Thrombophilia due to excessive plasminogen activator inhibitor OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=173360 173360]]

==About this Structure==
1A7C is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1A7C OCA]. 

==Reference==
Interfering with the inhibitory mechanism of serpins: crystal structure of a complex formed between cleaved plasminogen activator inhibitor type 1 and a reactive-centre loop peptide., Xue Y, Bjorquist P, Inghardt T, Linschoten M, Musil D, Sjolin L, Deinum J, Structure. 1998 May 15;6(5):627-36. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9634700 9634700]
[[Category: Homo sapiens]]
[[Category: Single protein]]
[[Category: Deinum, J.]]
[[Category: Inghardt, T.]]
[[Category: Sjolin, L.]]
[[Category: Xue, Y.]]
[[Category: NAG]]
[[Category: carbohydrate]]
[[Category: inhibitor complex]]
[[Category: pai-1]]
[[Category: peptide]]
[[Category: serine protease inhibitor]]

''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 09:53:57 2008''