Abstract
The crystal structure of the S189D+A226G rat chymotrypsin-B mutant has been determined at 2.2 Å resolution. This mutant is the most trypsin-like mutant so far in the line of chymotrypsin-to-trypsin conversions, aiming for a more complete understanding of the structural basis of substrate specificity in pancreatic serine proteases. A226G caused significant rearrangements relative to S189D chymotrypsin, allowing an internal conformation of Asp189 which is close to that in trypsin. Serious distortions remain, however, in the activation domain, including zymogen-like features. The pH-profile of activity suggests that the conformation of the S1–site of the mutant is influenced also by the P1 residue of the substrate.
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Abbreviations
- AMC:
-
Amino-4-Methyl Coumarin
- BPTI:
-
Bovine pancreatic trypsin inhibitor
- CABS:
-
4-(Cyclohexylamino)-1-butanesulfonic acid
- CCP4:
-
Collaborative Computational Project Number 4
- CHES:
-
2-(Cyclohexylamino)ethanesulfonic acid
- DPI:
-
Dispersion precision indicator
- ESRF:
-
European Synchrotron Radiation Facility
- HEPES:
-
4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid
- MES:
-
2-(N-Morpholino)ethanesulfonic acid
- MOPS:
-
3-(N-Morpholino)propanesulfonic acid
- MUGB:
-
4-Guanidinobenzoic acid 4-methylumbelliferyl ester hydrochloride
- PDB:
-
Protein data bank
- PEG:
-
Polyethylene glycol
- SBTI:
-
Soybean trypsin inhibitor
- SDS-PAGE:
-
Sodium dodecyl sulfate - polyacrylamide gel electrophoresis
- TLS:
-
Translational, librational, screw
- TRIS:
-
Tris(hydroxymethyl)aminomethane
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Acknowledgements
We are grateful for the beamline staff at the ESRF ID14–2 beamline for their expert assistance. This work was supported by the Hungarian Research Fund OTKA TS049812 and T047154 to L.G., G. K. acknowledges the support from EMBO and CEA.
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Jelinek, B., Katona, G., Fodor, K. et al. The Crystal Structure of a Trypsin-like Mutant Chymotrypsin: The Role of Position 226 in the Activity and Specificity of S189D Chymotrypsin. Protein J 27, 79–87 (2008). https://doi.org/10.1007/s10930-007-9110-3
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DOI: https://doi.org/10.1007/s10930-007-9110-3