1b6l: Difference between revisions

Revision as of 11:08, 2 May 2008

HIV-1 PROTEASE COMPLEXED WITH MACROCYCLIC PEPTIDOMIMETIC INHIBITOR 4

OverviewOverview

High-resolution crystal structures are described for seven macrocycles complexed with HIV-1 protease (HIVPR). The macrocycles possess two amides and an aromatic group within 15-17 membered rings designed to replace N- or C-terminal tripeptides from peptidic inhibitors of HIVPR. Appended to each macrocycle is a transition state isostere and either an acyclic peptide, nonpeptide, or another macrocycle. These cyclic analogues are potent inhibitors of HIVPR, and the crystal structures show them to be structural mimics of acyclic peptides, binding in the active site of HIVPR via the same interactions. Each macrocycle is restrained to adopt a beta-strand conformation which is preorganized for protease binding. An unusual feature of the binding of C-terminal macrocyclic inhibitors is the interaction between a positively charged secondary amine and a catalytic aspartate of HIVPR. A bicyclic inhibitor binds similarly through its secondary amine that lies between its component N-terminal and C-terminal macrocycles. In contrast, the corresponding tertiary amine of the N-terminal macrocycles does not interact with the catalytic aspartates. The amine-aspartate interaction induces a 1.5 A N-terminal translation of the inhibitors in the active site and is accompanied by weakened interactions with a water molecule that bridges the ligand to the enzyme, as well as static disorder in enzyme flap residues. This flexibility may facilitate peptide cleavage and product dissociation during catalysis. Proteases [Aba67,95]HIVPR and [Lys7,Ile33,Aba67,95]HIVPR used in this work were shown to have very similar crystal structures.

About this StructureAbout this Structure

1B6L is a Single protein structure of sequence from Human immunodeficiency virus type 1 (isolate arv2/sf2). Full crystallographic information is available from OCA.

ReferenceReference

Molecular recognition of macrocyclic peptidomimetic inhibitors by HIV-1 protease., Martin JL, Begun J, Schindeler A, Wickramasinghe WA, Alewood D, Alewood PF, Bergman DA, Brinkworth RI, Abbenante G, March DR, Reid RC, Fairlie DP, Biochemistry. 1999 Jun 22;38(25):7978-88. PMID:10387041 Page seeded by OCA on Fri May 2 11:08:11 2008

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OCA

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 [[Image:1b6l.jpg|left|200px]]
- {{Structure
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+The line below this paragraph, containing "STRUCTURE_1b6l", creates the "Structure Box" on the page.
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-|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/HIV-1_retropepsin HIV-1 retropepsin], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.23.16 3.4.23.16] </span>
+or leave the SCENE parameter empty for the default display.
-|GENE=
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-|DOMAIN=
+{{STRUCTURE_1b6l|  PDB=1b6l  |  SCENE=  }}
-|RELATEDENTRY=[[1b6j|1B6J]], [[1b6k|1B6K]], [[1b6m|1B6M]], [[1b6n|1B6N]], [[1b6o|1B6O]], [[1b6p|1B6P]]
-|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1b6l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1b6l OCA], [http://www.ebi.ac.uk/pdbsum/1b6l PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1b6l RCSB]</span>
-}}
 '''HIV-1 PROTEASE COMPLEXED WITH MACROCYCLIC PEPTIDOMIMETIC INHIBITOR 4'''
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 Molecular recognition of macrocyclic peptidomimetic inhibitors by HIV-1 protease., Martin JL, Begun J, Schindeler A, Wickramasinghe WA, Alewood D, Alewood PF, Bergman DA, Brinkworth RI, Abbenante G, March DR, Reid RC, Fairlie DP, Biochemistry. 1999 Jun 22;38(25):7978-88. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10387041 10387041]
 [[Category: HIV-1 retropepsin]]
-[[Category: Human immunodeficiency virus type 1 (isolate arv2/sf2)]]
 [[Category: Single protein]]
 [[Category: Abbenante, G.]]
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 [[Category: Schindeler, A.]]
 [[Category: Wickramasinghe, W A.]]
-[[Category: complex (acid proteinase/peptide)]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 11:08:11 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 18:54:43 2008''