2aih: Difference between revisions

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[[Image:2aih.gif|left|200px]]
{{Seed}}
[[Image:2aih.png|left|200px]]


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{{STRUCTURE_2aih|  PDB=2aih  |  SCENE=  }}  
{{STRUCTURE_2aih|  PDB=2aih  |  SCENE=  }}  


'''1H-NMR solution structure of a trypsin/chymotrypsin Bowman-Birk inhibitor from Lens culinaris.'''
===1H-NMR solution structure of a trypsin/chymotrypsin Bowman-Birk inhibitor from Lens culinaris.===




==Overview==
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Bowman-Birk serine protease inhibitors are a family of small plant proteins, whose physiological role has not been ascertained as yet, while chemopreventive anticarcinogenic properties have repeatedly been claimed. In this work we present data on the isolation of a lentil (Lens culinaris, L., var. Macrosperma) seed trypsin inhibitor (LCTI) and its functional and structural characterization. LCTI is a 7448 Da double-headed trypsin/chymotrypsin inhibitor with dissociation constants equal to 0.54 nM and 7.25 nM for the two proteases, respectively. The inhibitor is, however, hydrolysed by trypsin in a few minutes timescale, leading to a dramatic loss of its affinity for the enzyme. This is due to a substantial difference in the kon and k*on values (1.1 microM-1.s-1 vs. 0.002 microM-1.s-1), respectively, for the intact and modified inhibitor. A similar behaviour was not observed with chymotrypsin. The twenty best NMR structures concurrently showed a canonical Bowman-Birk inhibitor (BBI) conformation with two antipodal beta-hairpins containing the inhibitory domains. The tertiary structure is stabilized by ion pairs and hydrogen bonds involving the side chain and backbone of Asp10-Asp26-Arg28 and Asp36-Asp52 residues. At physiological pH, the final structure results in an asymmetric distribution of opposite charges with a negative electrostatic potential, centred on the C-terminus, and a highly positive potential, surrounding the antitryptic domain. The segment 53-55 lacks the anchoring capacity found in analogous BBIs, thus rendering the protein susceptible to hydrolysis. The inhibitory properties of LCTI, related to the simultaneous presence of two key amino acids (Gln18 and His54), render the molecule unusual within the natural Bowman-Birk inhibitor family.
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{{ABSTRACT_PUBMED_16889634}}


==About this Structure==
==About this Structure==
2AIH is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Lens_culinaris Lens culinaris]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2AIH OCA].  
2AIH is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Lens_culinaris Lens culinaris]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2AIH OCA].  


==Reference==
==Reference==
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[[Category: Trypsin/chymotrypsin bowman-birk inhibitor]]
[[Category: Trypsin/chymotrypsin bowman-birk inhibitor]]
[[Category: Two-strands beta-sheet]]
[[Category: Two-strands beta-sheet]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 19:05:37 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 09:53:22 2008''

Revision as of 06:53, 28 July 2008

File:2aih.png

Template:STRUCTURE 2aih

1H-NMR solution structure of a trypsin/chymotrypsin Bowman-Birk inhibitor from Lens culinaris.

Template:ABSTRACT PUBMED 16889634

About this Structure

2AIH is a Single protein structure of sequence from Lens culinaris. Full experimental information is available from OCA.

Reference

Inhibitory properties and solution structure of a potent Bowman-Birk protease inhibitor from lentil (Lens culinaris, L) seeds., Ragg EM, Galbusera V, Scarafoni A, Negri A, Tedeschi G, Consonni A, Sessa F, Duranti M, FEBS J. 2006 Sep;273(17):4024-39. Epub 2006 Aug 2. PMID:16889634

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