Abstract
Although it has become widely accepted that domains are the basic units of structure, function and evolution in proteins1 and it is thought that proteins with complex functions evolve by fusion of genes coding for individual domains2,3, the domains are not uniformly defined. Most commonly, domains are simply the compact and more or less loosely connected areas1,4 apparent from a visual inspection of protein models; to avoid subjectivity and ambiguities inherent in visual inspection, certain computer algorithms for location of these ‘structural’ domains have recently been proposed5–7. An alternative interpretation is that domains are stable protein fragments found in biochemical experiments8–17. I regard them as ‘globular fragments’ which may refold autonomously and carry specific functions1, and I propose here a method for location of these globular fragments based on surface area18 measurements. Applied to several proteins the globular fragments found often coincide with structural domains or are contained within them. In particular the globular fragments found in globins correlate with the two structural domains proposed previously4,19, and do not correlate with the three coding sequences separated by introns in the haemoglobin genes20–22.
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Rashin, A. Location of domains in globular proteins. Nature 291, 85–87 (1981). https://doi.org/10.1038/291085a0
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DOI: https://doi.org/10.1038/291085a0
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