The tertiary structures of pectate lyases andrhamnogalacturonase A show a stack of parallel beta strands that are coiled into a large helix. Each coil of the helix representsa structural repeat that, in some homologues, can be recognised from sequence information alone.Conservation of asparagines might be connected with asparagine-ladders that contribute to thestability of the fold. Proteins containing these repeats most often are enzymes with polysaccharidesubstrates [1].

1. Structure and evolution of parallel beta-helix proteins. J. Struct. Biol. 122, 236-46

The tertiary structures of pectate lyases andrhamnogalacturonase A show a stack of parallel beta
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