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2ci2

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[[Image:2ci2.jpg|left|200px]]
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{{Seed}}
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{{STRUCTURE_2ci2| PDB=2ci2 | SCENE= }}
{{STRUCTURE_2ci2| PDB=2ci2 | SCENE= }}
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'''CRYSTAL AND MOLECULAR STRUCTURE OF THE SERINE PROTEINASE INHIBITOR CI-2 FROM BARLEY SEEDS'''
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===CRYSTAL AND MOLECULAR STRUCTURE OF THE SERINE PROTEINASE INHIBITOR CI-2 FROM BARLEY SEEDS===
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==Overview==
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Chymotrypsin inhibitor 2 (CI-2), a serine proteinase inhibitor from barley seeds, has been crystallized and its three-dimensional structure determined at 2.0-A resolution by the molecular replacement method. The structure has been refined by restrained-parameter least-squares methods to a crystallographic R factor (= sigma parallel Fo magnitude of-Fo parallel/sigma magnitude of Fo) o of 0.198. CI-2 is a member of the potato inhibitor 1 family. It lacks the characteristic stabilizing disulfide bonds of most other members of serine proteinase inhibitor families. The body of CI-2 shows few conformational changes between the free inhibitor and the previously reported structure of CI-2 in complex with subtilisin Novo [McPhalen, C.A., Svendsen, I., Jonassen, I., &amp; James, M.N.G. (1985) Proc. Natl. Acad. Sci. U.S.A. 82, 7242-7246]. However, the reactive site loop has some significant conformational differences between the free inhibitor and its complexed form. The residues in this segment of polypeptide exhibit relatively large thermal motion parameters and some disorder in the uncomplexed form of the inhibitor. The reactive site bond is between Met-59I and Glu-60I in the consecutive sequential numbering of CI-2 (Met-60-Glu-61 according to the alignment of Svendsen et al. [Svendsen, I., Hejgaard, J., &amp; Chavan, J.K. (1984) Carlsberg Res. Commun. 49, 493-502]). The network of hydrogen bonds and electrostatic interactions stabilizing the conformation of the reactive site loop is much less extensive in the free than in the complexed inhibitor.
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The line below this paragraph, {{ABSTRACT_PUBMED_3828302}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 3828302 is the PubMed ID number.
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{{ABSTRACT_PUBMED_3828302}}
==About this Structure==
==About this Structure==
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[[Category: James, M N.G.]]
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[[Category: Mcphalen, C A.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 22:12:00 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 09:21:48 2008''

Revision as of 06:21, 28 July 2008

Image:2ci2.png

Template:STRUCTURE 2ci2

CRYSTAL AND MOLECULAR STRUCTURE OF THE SERINE PROTEINASE INHIBITOR CI-2 FROM BARLEY SEEDS

Template:ABSTRACT PUBMED 3828302

About this Structure

2CI2 is a Single protein structure of sequence from Hordeum vulgare. This structure supersedes the now removed PDB entry 1ci2. Full crystallographic information is available from OCA.

Reference

Crystal and molecular structure of the serine proteinase inhibitor CI-2 from barley seeds., McPhalen CA, James MN, Biochemistry. 1987 Jan 13;26(1):261-9. PMID:3828302

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