1H71

Psychrophilic Protease from Pseudoalteromonas 'TAC II 18'

Summary for 1H71

• Entry DOI: 10.2210/pdb1h71/pdb
• Descriptor: SERRALYSIN, CALCIUM ION, ZINC ION, ... (4 entities in total)
• Functional Keywords: psychrophilic, adaptation to cold, protease, different crystal forms, hydrolase
• Biological source: PSEUDOMONAS SP. TAC II 18
• Total number of polymer chains: 1
• Total formula weight: 49110.58

Authors

Villeret, V.,Van Petegem, F.,Aghajari, N.,Chessa, J.-P.,Gerday, C.,Haser, R.,Van Beeumen, J. (deposition date: 2001-07-02, release date: 2003-02-13, Last modification date: 2023-12-13)

Primary citation

Aghajari, N.,Van Petegem, F.,Villeret, V.,Chessa, J.-P.,Gerday, C.,Haser, R.,Van Beeumen, J.
Crystal Structures of a Psychrophilic Metalloprotease Reveal New Insights Into Catalysis by Cold-Adapted Proteases
Proteins: Struct.,Funct., Genet., 50:636-, 2003

PubMed Abstract: Enzymes from psychrophilic organisms differ from their mesophilic counterparts in having a lower thermostability and a higher specific activity at low and moderate temperatures. It is in general accepted that psychrophilic enzymes are more flexible to allow easy accommodation and transformation of the substrates at low energy costs. Here, we report the structures of two crystal forms of the alkaline protease from an Antarctic Pseudomonas species (PAP), solved to 2.1- and 1.96-A resolution, respectively. Comparative studies of PAP structures with mesophilic counterparts show that the overall structures are similar but that the conformation of the substrate-free active site in PAP resembles that of the substrate-bound region of the mesophilic homolog, with both an active-site tyrosine and a substrate-binding loop displaying a conformation as in the substrate-bound form of the mesophilic proteases. Further, a region in the catalytic domain of PAP undergoes a conformational change with a loop movement as large as 13 A, induced by the binding of an extra calcium ion. Finally, the active site is more accessible due to deletions occurring in surrounding loop regions.

PubMed: 12577270
DOI: 10.1002/PROT.10264

Experimental method

X-RAY DIFFRACTION (2.1 Å)