Cloning and molecular modeling of a thermostable carboxylesterase from the chicken uropygial glands

The helices α1 (residues 72–82) and α9 (residues 340–346) which are located on the top of the central β-sheet were proposed as potential lid and second lid, respectively. These two structural units (α1 and α9) may act as a double door controlling the access to the active site of the chicken uropygial carboxylesterase.