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Additional binding sites in lysozyme. X-ray analysis of lysozyme complexes with bromophenol red and bromophenol blue

*, Madhusudan and Vijayan, M (1992) Additional binding sites in lysozyme. X-ray analysis of lysozyme complexes with bromophenol red and bromophenol blue. In: Protein Engineering, 5 (5). pp. 399-404.

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Official URL: http://peds.oxfordjournals.org/cgi/content/abstrac...

Abstract

The binding sites in hen egg-white lysozyme for neutral bromophenol red (BPR) and ionized bromophenol blue (BPB) have been characterized at 2 Å resolution. In either case, the dye-bound enzyme is active against the polysaccharide, but not against the cell wall. Both binding sites are outside, but close to, the hexasaccharide binding cleft in the enzyme. The binding site of BPR made up of Arg5, Lys33, Phe34, Asn37, Phe38, Ala122, Trp123 and possibly Arg125, is dose to subsite F while that of BPB made up of Tyr20, Arg21, Asn93, Lys96, Lys97 and Ser100, is close to subsites A and B. The binding sites of the neutral dye and the ionized dye are thus spatially far apart. The peptide component of the bacterial cell wall probably interacts with these cells during enzyme action. Such interactions are perhaps necessary for appropriately positioning the enzyme molecule on the bacterial cell wall.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Oxford University Press.
Keywords: additional binding sites; lysozyme action; lysozymedye complexes; phenolsulphophthalein dyes; X-ray crystallography.
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 20 Oct 2009 07:43
Last Modified: 20 Oct 2009 07:43
URI: http://eprints.iisc.ernet.in/id/eprint/24597

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