3QGO

Structure of Thermolysin in complex with L-Phenylalanine methylester

Summary for 3QGO

• Entry DOI: 10.2210/pdb3qgo/pdb
• Related: 2TLX 4TMN 5TMN 6TMN 7TLN 8TLN
• Descriptor: Thermolysin, CALCIUM ION, ZINC ION, ... (8 entities in total)
• Functional Keywords: hydrolase, metalloproteinase, l-phenylalanine methyl ester
• Biological source: Bacillus thermoproteolyticus
• Cellular location: Secreted: P00800
• Total number of polymer chains: 1
• Total formula weight: 35903.68

Authors

Birrane, G.,Bhyravbhatla, B.,Navia, M. (deposition date: 2011-01-24, release date: 2012-01-04, Last modification date: 2023-12-06)

Primary citation

Birrane, G.,Bhyravbhatla, B.,Navia, M.A.
Synthesis of Aspartame by Thermolysin: An X-ray Structural Study.
ACS MED.CHEM.LETT., 5:706-710, 2014

PubMed Abstract: Protease mediated peptide synthesis (PMPS) was first described in the 1930s but remains underexploited today. In most PMPS, the reaction equilibrium is shifted toward synthesis by the aqueous insolubility of product generated. Substrates and proteases are selected by trial and error, yields are modest, and reaction times are slow. Once implemented, however, PMPS reactions can be simple, environmentally benign, and readily scalable to a commercial level. We examined the PMPS of a precursor of the artificial sweetener aspartame, a multiton peptide synthesis catalyzed by the enzyme thermolysin. X-ray structures of thermolysin in complex with aspartame substrates separately, and after PMPS in a crystal, rationalize the reaction's substrate preferences and reveal an unexpected form of substrate inhibition that explains its sluggishness. Structure guided optimization of this and other PMPS reactions could expand the economic viability of commercial peptides beyond current high-potency, low-volume therapeutics, with substantial green chemistry advantages.

PubMed: 24944748
DOI: 10.1021/ml500101z

Experimental method

X-RAY DIFFRACTION (1.45 Å)