[modeller_usage] Problem with Flex-em fitting

Hi,

I am trying to use flex-em using modeller 9.15. It is working fine with files given in tutorial. But I have got a structure with 4 chains and a corresponding cubic density map.

1. Now if I am using the rigid.txt file as #helix #chain A 4:A 11:A

Then I am getting the error: KeyError: 'No such residue: 4:A'

2. If I am using the rigid.txt as #helix #chain A 4 11

then I am getting the error: if resnum[-1] == 'nr': IndexError: list index out of range

3. If I a, using the rigid.txt as #helix #chain A 4 11 nr

then I am getting the error: _modeller.ModellerError: select__690E> Atom index 25 is in multiple rigid bodies!

4. If I a, using the rigid.txt as #helix #chain A 4:A:11:A: 14:A:21:A:

then I am getting the error: list.add(mdl.residue_range(resnum[i], resnum[i+1])) IndexError: list index out of range

Please let me know what is the correct format of rigid.txt file for multiple chains.

One more thing is my PDB contains 4 chains. So where can I give rigid bodies to all of them. Is it the no of iterations in flex-em.py file ?

Any suggestion is welcome. Please help.

Thanks Sushree.