remarks file toppar/pseudo.top  
remarks   topology for pseudo atoms. Use in conjunction with toppar/pseudo.param
remarks   Note: contains a residue that defines pseudo atoms and a patch file for connections with CA atoms
remarks         Only a bond between the pseudo atom and CA is created, no angle terms are created.
remarks         Thus, it is recommended to only use this pseudo atom residue if it is part of a rigid body
remarks         or if torsion angle dynamics is used.  If this pseudo atom residue is used in conjunction with 
remarks         Cartesian minimization or molecular dynamics, the angles between pseudo-atom, CA, and atoms bonded
remarks         to CA will be distorted. 

set message ? end eval ($old_message=$result) set echo ? end eval ($old_echo=$result)
set message=off echo=off end

checkversion 1.3

!------------------------------------------------------------------------

mass PSDO 1. 
 
!------------------------------------------------------------------------
 
RESIdue PSO 
GROUp
    ATOM PSDO TYPE=PSDO CHARge=0. END
END

!------------------------------------------------------------------------

PRESidue PSCA

ADD BOND -CA +PSDO 

END

!------------------------------------------------------------------------

set message=$old_message echo=$old_echo end