CD4 structure

Below is a three-dimensional representation of the protein, CD4. I would like to know what the arrows and the thin wires between them mean.


The flat arrows are a cartoon representation of β-strands (one type of regular hydrogen-bonded secondary structure). The direction of the arrow is the direction of the amino acid sequence (arrow head pointing towards the C-terminus).

The thin wires are regions with no regular structure.

There are also two small green spiral ribbons in the foreground left and right, which represent α-helices (the other main regular secondary structure).

  • $\begingroup$ Thank you for the fast answer. It is really hard to find that information since there is no keywords to google.. $\endgroup$ – imcakmak Apr 19 '16 at 22:32
  • $\begingroup$ You're welcome. I was looking for something else and it just caught my eye. $\endgroup$ – David Apr 19 '16 at 22:45
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    $\begingroup$ There are two small helices, but the structure is generally a beta-sandwich. $\endgroup$ – gilleain Apr 20 '16 at 10:42
  • $\begingroup$ @gilleain Thanks. I hadn't noticed. I'll update my answer. $\endgroup$ – David Apr 20 '16 at 10:46
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    $\begingroup$ @m1clee The keywords you need for Google are "ribbon diagram" or "Richardson diagram". $\endgroup$ – R.M. Apr 20 '16 at 17:24

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