The immunoglobulin fold. Structural classification, sequence patterns and common core

Journal of Molecular Biology
P BorkC Sander

Abstract

Since the first crystal structure of an immunoglobulin revealed a modular architecture, the characteristic beta-sheet fold of the immunoglobulin domain has been found in many other proteins of diverse biological function. Here, a systematic comparison of 23 Ig domain structures with less than 25% pairwise residue identity was performed using automatic structural alignment and analysis of beta-sheet and loop topology. Sequence consensus patterns were identified for nine distinct families with at most marginal similarity to each other. The analysis reveals a common structural core of only four beta-strands (b, c, e and f), embedded in an antiparallel curled beta-sheet sandwich with a total of three to five additional strands (a, c', c'', d, g) and a characteristic intersheet angle. The variation in the position of the edge strands (a, c', c'', d and g) relative to the common core defines four different topological subtypes that correlate with the length of the intervening sequence between strands c and e, the most variable region in sequence. The switch of strand c' from one sheet to the other in seven-stranded domains appears to result from short c-e segments, rather than being a major structural discriminator. The high degree o...Continue Reading

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