1g9k: Difference between revisions

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[[Image:1g9k.jpg|left|200px]]
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[[Image:1g9k.png|left|200px]]


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{{STRUCTURE_1g9k|  PDB=1g9k  |  SCENE=  }}  
{{STRUCTURE_1g9k|  PDB=1g9k  |  SCENE=  }}  


'''CRYSTAL STRUCTURE OF A PSYCHROPHILIC ALKALINE PROTEASE FROM PSEUDOMONAS TAC II 18'''
===CRYSTAL STRUCTURE OF A PSYCHROPHILIC ALKALINE PROTEASE FROM PSEUDOMONAS TAC II 18===




==Overview==
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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.
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{{ABSTRACT_PUBMED_12577270}}


==About this Structure==
==About this Structure==
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[[Category: Haser, R.]]
[[Category: Haser, R.]]
[[Category: Beta jelly roll]]
[[Category: Beta jelly roll]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 04:56:57 2008''

Revision as of 01:56, 1 July 2008

File:1g9k.png

Template:STRUCTURE 1g9k

CRYSTAL STRUCTURE OF A PSYCHROPHILIC ALKALINE PROTEASE FROM PSEUDOMONAS TAC II 18

Template:ABSTRACT PUBMED 12577270

About this Structure

1G9K is a Single protein structure of sequence from Pseudomonas. Full crystallographic information is available from OCA.

Reference

Crystal structures of a psychrophilic metalloprotease reveal new insights into catalysis by cold-adapted proteases., Aghajari N, Van Petegem F, Villeret V, Chessa JP, Gerday C, Haser R, Van Beeumen J, Proteins. 2003 Mar 1;50(4):636-47. PMID:12577270

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