3SVA: Crystal structure of V57D mutant of human cystatin C

Citation:
Abstract
Wild-type human cystatin C (hCC wt) is a low-molecular-mass protein (120 amino-acid residues, 13,343 Da) that is found in all nucleated cells. Physiologically, it functions as a potent regulator of cysteine protease activity. While the biologically active hCC wt is a monomeric protein, all crystallization efforts to date have resulted in a three-dimensional domain-swapped dimeric structure. In the recently published structure of a mutated hCC, the monomeric fold was preserved by a stabilization of the conformationally constrained loop L1 caused by a single amino-acid substitution: Val57Asn. Additional hCC mutants were obtained in order to elucidate the relationship between the stability of the L1 loop and the propensity of human cystatin C to dimerize. In one mutant Val57 was substituted by an aspartic acid residue, which is favoured in beta-turns, and in the second mutant proline, a residue known for broadening turns, was substituted for the same Val57. Here, 2.26 and 3.0 A resolution crystal structures of the V57D andV57P mutants of hCC are reported and their dimeric architecture is discussed in terms of the stabilization and destabilization effects of the introduced mutations.
PDB ID: 3SVADownload
MMDB ID: 101566
PDB Deposition Date: 2011/7/12
Updated in MMDB: 2016/12
Experimental Method:
x-ray diffraction
Resolution: 3.02  Å
Source Organism:
Similar Structures:
Biological Unit for 3SVA: dimeric; determined by author and by software (PISA)
Molecular Components in 3SVA
Label Count Molecule
Proteins (2 molecules)
2
Cystatin-c(Gene symbol: CST3)
Molecule annotation
Chemicals (4 molecules)
1
2
2
2
* Click molecule labels to explore molecular sequence information.

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