load 3QTP.pdb, 3QTP
load 3qtp.omap, el-dens
remove chain B
remove resn HOH
remove resn 2PG
remove resn SO4
center resi 424
select chain A, chain A
set line_width, 10
color orange
isomesh new_map, el-dens, 1, chain A and (name ca+c+n+o), carve=2