Sandbox Reserved 954: Difference between revisions

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Structural studies on serpins revealed that inhibitory members of the family undergo an unusual conformational change, termed the Stressed to Relaxed (S to R) transition. During this structural transition the <scene name='60/604473/The_rcl_loop_scene/3'>RCL</scene> inserts into β-sheet A and forms an extra fourth β strand . The serpin conformational change is key to the mechanism of inhibition of target proteases.

<ref> James C Whisstocka, 2, Richard Skinnera, 2, Robin W Carrella, Arthur M Leska, Conformational changes in serpins: I. the native and cleaved conformations of α1-antitrypsin1, http://www.sciencedirect.com/science/article/pii/S0022283699935209 DOI:pii/S0022283699935209</ref>

When a protease attack a substrate, it catalyze peptide bond cleavage in a two-step process. First, the catalytic serine or cysteine performs a nucleophilic attack on the peptide bond of the substrate. This ~~releases the new N-terminus and~~ forms an ~~ester~~ bond between the enzyme and the substrate. This covalent enzyme-substrate complex is called an acyl enzyme intermediate. Then, this ~~ester~~ bond is hydrolyzed and the ~~new~~ C-terminus is released.

When a protease attack a substrate, it catalyze peptide bond cleavage in a two-step process. First, the catalytic serine or cysteine performs a nucleophilic attack on the peptide bond of the substrate. This forms an new bond between the enzyme and the substrate. This covalent enzyme-substrate complex is called an acyl enzyme intermediate. Then, this bond is hydrolyzed and the C-terminus is released.

Sandbox Reserved 954: Difference between revisions

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@@ Line 40: / Line 40: @@
 Structural studies on serpins revealed that inhibitory members of the family undergo an unusual conformational change, termed the Stressed to Relaxed (S to R) transition. During this structural transition the <scene name='60/604473/The_rcl_loop_scene/3'>RCL</scene> inserts into β-sheet A and forms an extra fourth β strand . The serpin conformational change is key to the mechanism of inhibition of target proteases.
 <ref> James C Whisstocka, 2, Richard Skinnera, 2, Robin W Carrella, Arthur M Leska, Conformational changes in serpins: I. the native and cleaved conformations of α1-antitrypsin1, http://www.sciencedirect.com/science/article/pii/S0022283699935209 DOI:pii/S0022283699935209</ref>
-When a protease attack a substrate, it catalyze peptide bond cleavage in a two-step process. First, the catalytic serine or cysteine performs a nucleophilic attack on the peptide bond of the substrate. This releases the new N-terminus and forms an ester bond between the enzyme and the substrate. This covalent enzyme-substrate complex is called an acyl enzyme intermediate. Then, this ester bond is hydrolyzed and the new C-terminus is released.
+When a protease attack a substrate, it catalyze peptide bond cleavage in a two-step process. First, the catalytic serine or cysteine performs a nucleophilic attack on the peptide bond of the substrate. This forms an new bond between the enzyme and the substrate. This covalent enzyme-substrate complex is called an acyl enzyme intermediate. Then, this bond is hydrolyzed and the C-terminus is released.