ISDA: 1R8O

Deposition Date 2003-10-27

Release Date 2004-05-25

Last Version Date 2024-10-30

Entry Detail

PDB ID:

1R8O

Keywords:

HYDROLASE INHIBITOR

Title:

Crystal structure of an unusual Kunitz-type trypsin inhibitor from Copaifera langsdorffii seeds

Biological Source:

Source Organism:

Copaifera langsdorffii (Taxon ID: 280048)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.83 Å

R-Value Free:

0.21

R-Value Work:

0.16

R-Value Observed:

0.17

Space Group:

P 43 21 2

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Macromolecular Entities

Polymer Type:polypeptide(L)
Molecule:Kunitz trypsin inhibitor
Chain IDs:A
Chain Length:96
Number of Molecules:1
Biological Source:Copaifera langsdorffii

Polymer Type:polypeptide(L)
Molecule:Kunitz trypsin inhibitor
Chain IDs:B
Chain Length:71
Number of Molecules:1
Biological Source:Copaifera langsdorffii

Primary Citation

Three-dimensional structure of an unusual Kunitz (STI) type trypsin inhibitor from Copaifera langsdorffii.

Krauchenco, S, Nagem, R.A.P, Da Silva, J.A, Marangoni, S, Polikarpov, I, Krauchenco, S, Silva, J.A, Nagem, R.A.P, Brando Neto, J.R, Forrer, V.P, Carmona e Ferreira, R, Macedo, M.L.R, Novello, J.C, Marangoni, S, Polikarpov, I, da Silva, J.A, Macedo, M.L.R, Novello, J.C, Marangoni, S.Show

Biochimie 86 167 172 (2004)

PMID: 15134830 DOI: 10.1016/j.biochi.2004.03.004

Abstact

The crystallographic structure of a novel trypsin inhibitor (CTI) from Copaifera langsdorffii is reported. The structure was solved by MIRAS procedure and refined to a crystallographic residual of 17.3% (R(free) = 20.3%) at 1.8 A resolution. Two isomorphous derivatives were obtained by quick cryo-soaking approach. CTI is the first structure of a member of Kunitz (STI) family formed by two noncovalently bound polypeptide chains and only one disulfide bridge. A standard Kunitz-type inhibitor has a single polypeptide chain and two disulfide bridges. Structural features granting CTI high inhibitory activity are discussed.

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Primary Citation of related structures

Abstact

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