1gn2 is a 8 chain structure with sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
With the aim of enhancing interactions involved in dimer formation, an intersubunit disulfide bridge was engineered in the superoxide dismutase enzyme of Mycobacterium tuberculosis. Ser-123 was chosen for mutation to cysteine since it resides at the dimer interface where the serine side chain interacts with the same residue in the opposite subunit. Gel electrophoresis and X-ray crystallographic studies of the expressed mutant confirmed formation of the disulfide bond under nonreducing conditions. However, the mutant protein was found to be less stable than the wild type as judged by susceptibility to denaturation in the presence of guanidine hydrochloride. Decreased stability probably results from formation of a disulfide bridge with a suboptimal torsion angle and exclusion of solvent molecules from the dimer interface.
Engineering of an intersubunit disulfide bridge in the iron-superoxide dismutase of Mycobacterium tuberculosis.,Bunting KA, Cooper JB, Tickle IJ, Young DB Arch Biochem Biophys. 2002 Jan 1;397(1):69-76. PMID:11747311[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
↑ Bunting KA, Cooper JB, Tickle IJ, Young DB. Engineering of an intersubunit disulfide bridge in the iron-superoxide dismutase of Mycobacterium tuberculosis. Arch Biochem Biophys. 2002 Jan 1;397(1):69-76. PMID:11747311 doi:10.1006/abbi.2001.2635
