|1khq, resolution 1.60Å ()|
|Related:||1pad, 5pad, 6pad, 9pap, 1ppn, 2pad, 1pe6, 1pip, 1ppp, 1ppd, 1pop, 1stf, 1cvz, 1khp|
ORTHORHOMBIC FORM OF PAPAIN/ZLFG-DAM COVALENT COMPLEX
The three-dimensional structure of two polymorphs of a ZLFG-CH2-papain covalent complex has been determined by X-ray crystallography. The structures indicate that: (i) the methylene carbon atom of the inhibitor is covalently bound to the Sgamma atom of Cys25 of papain; (ii) the hydrophobic S2 pocket formed by Pro68, Val133, Val157, and Asp158 is occupied by the inhibitor's phenylalanyl P2 side chain; (iii) extensive hydrogen bonding and hydrophobic interactions are responsible for the interaction of the inhibitor with the enzyme. Comparison with similar structures suggests that in covalent complexes preservation of main chain-main chain interactions between the enzyme and the inhibitor may have higher priority than the P-S interactions.
Two polymorphs of a covalent complex between papain and a diazomethylketone inhibitor., Janowski R, Kozak M, Jankowska E, Grzonka Z, Jaskolski M, J Pept Res. 2004 Oct;64(4):141-50. PMID:15357669
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
About this Structure
- Janowski R, Kozak M, Jankowska E, Grzonka Z, Jaskolski M. Two polymorphs of a covalent complex between papain and a diazomethylketone inhibitor. J Pept Res. 2004 Oct;64(4):141-50. PMID:15357669 doi:http://dx.doi.org/10.1111/j.1399-3011.2004.00181.x