1ST3

THE CRYSTAL STRUCTURE OF THE BACILLUS LENTUS ALKALINE PROTEASE, SUBTILISIN BL, AT 1.4 ANGSTROMS RESOLUTION

Summary for 1ST3

• Entry DOI: 10.2210/pdb1st3/pdb
• Descriptor: SUBTILISIN BL, CALCIUM ION (3 entities in total)
• Functional Keywords: serine protease
• Biological source: Bacillus lentus
• Cellular location: Secreted: P29599
• Total number of polymer chains: 1
• Total formula weight: 26910.69

Authors

Goddette, D.W. (deposition date: 1991-11-22, release date: 1994-01-31, Last modification date: 2024-02-14)

Primary citation

Goddette, D.W.,Paech, C.,Yang, S.S.,Mielenz, J.R.,Bystroff, C.,Wilke, M.E.,Fletterick, R.J.
The crystal structure of the Bacillus lentus alkaline protease, subtilisin BL, at 1.4 A resolution.
J.Mol.Biol., 228:580-595, 1992

PubMed Abstract: The crystal structure of subtilisin BL, an alkaline protease from Bacillus lentus with activity at pH 11, has been determined to 1.4 A resolution. The structure was solved by molecular replacement starting with the 2.1 A structure of subtilisin BPN' followed by molecular dynamics refinement using X-PLOR. A final crystallographic R-factor of 19% overall was obtained. The enzyme possesses stability at high pH, which is a result of the high pI of the protein. Almost all of the acidic side-chains are involved in some type of electrostatic interaction (ion pairs, calcium binding, etc.). Furthermore, three of seven tyrosine residues have potential partners for forming salt bridges. All of the potential partners are arginine with a pK around 12. Lysine would not function well in a salt bridge with tyrosine as it deprotonates at around the same pH as tyrosine ionizes. Stability at high pH is acquired in part from the pI of the protein, but also from the formation of salt bridges (which would affect the pI). The overall structure of the enzyme is very similar to other subtilisins and shows that the subtilisin fold is more highly conserved than would be expected from the differences in amino acid sequence. The amino acid side-chains in the hydrophobic core are not conserved, though the inter-residue interactions are. Finally, one third of the serine side-chains in the protein have multiple conformations. This presents an opportunity to correlate computer simulations with observed occupancies in the crystal structure.

PubMed: 1453465
DOI: 10.1016/0022-2836(92)90843-9

Experimental method

X-RAY DIFFRACTION (1.4 Å)