In ARP/wARP 7.0 there is a loop building program that will build only Rama-sensible conformations.
Its mostly structure driven and not density driven, but:

I never dared to try it at 4.5 A though.

A.

On 18 Oct 2007, at 20:55, seglynn wrote:

Dear CCP4ers,

I am attempting to build a short loop section into a low resolution map (4.5A). The electron density is clearly present but the low resolution is making it difficult to fit anything with sensible Ramachandran angles. Does anyone know of a program that will generate a series of potential loop conformations that I can compare against my map so that I can at least start with reasonable geometries? I have already tried the Fit Loop algorithm in COOT without success.

Many thanks

Steven Glynn

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