ISDA: 4B1T

Deposition Date 2012-07-12

Release Date 2012-08-01

Last Version Date 2024-11-13

Entry Detail

PDB ID:

4B1T

Keywords:

HYDROLASE/HYDROLASE INHIBITOR

Title:

Structure of the factor Xa-like trypsin variant triple-Ala (TA) in complex with eglin C

Biological Source:

Source Organism:

BOS TAURUS (Taxon ID: 9913)
HIRUDO MEDICINALIS (Taxon ID: 6421)

Host Organism:

ESCHERICHIA COLI

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.78 Å

R-Value Free:

0.21

R-Value Work:

0.18

R-Value Observed:

0.18

Space Group:

P 1 21 1

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:CATIONIC TRYPSIN
Gene (Uniprot):PRSS1
Mutagens:YES
Chain IDs:A, C
Chain Length:223
Number of Molecules:2
Biological Source:BOS TAURUS

UniProt ID:P00760 Pfam ID:PF00089 EC:3.4.21.4

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:EGLIN C
Mutagens:YES
Chain IDs:B, D
Chain Length:70
Number of Molecules:2
Biological Source:HIRUDO MEDICINALIS

UniProt ID:P01051 Pfam ID:PF00280

Ligand Molecules

EDO

GOL

Primary Citation

Thermodynamic signatures in macromolecular interactions involving conformational flexibility.

Menzel, A, Neumann, P, Schwieger, C, Stubbs, M.T.Show

Biol.Chem. 395 905 911 (2014)

PMID: 25003391 DOI: 10.1515/hsz-2014-0177

Abstact

The energetics of macromolecular interactions are complex, particularly where protein flexibility is involved. Exploiting serendipitous differences in the plasticity of a series of closely related trypsin variants, we analyzed the enthalpic and entropic contributions accompanying interaction with L45K-eglin C. Binding of the four variants show significant differences in released heat, although the affinities vary little, in accordance with the principle of enthalpy-entropy compensation. Binding of the most disordered variant is almost entirely enthalpically driven, with practically no entropy change. As structures of the complexes reveal negligible differences in protein-inhibitor contacts, we conclude that solvent effects contribute significantly to binding affinities.

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Primary Citation of related structures

Abstact

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