1cmk
From Proteopedia
(New page: 200px<br /> <applet load="1cmk" size="450" color="white" frame="true" align="right" spinBox="true" caption="1cmk, resolution 2.9Å" /> '''CRYSTAL STRUCTURES O...) |
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caption="1cmk, resolution 2.9Å" /> | caption="1cmk, resolution 2.9Å" /> | ||
'''CRYSTAL STRUCTURES OF THE MYRISTYLATED CATALYTIC SUBUNIT OF CAMP-DEPENDENT PROTEIN KINASE REVEAL OPEN AND CLOSED CONFORMATIONS'''<br /> | '''CRYSTAL STRUCTURES OF THE MYRISTYLATED CATALYTIC SUBUNIT OF CAMP-DEPENDENT PROTEIN KINASE REVEAL OPEN AND CLOSED CONFORMATIONS'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Three crystal structures, representing two distinct conformational states, of the mammalian catalytic subunit of cAMP-dependent protein kinase were | + | Three crystal structures, representing two distinct conformational states, of the mammalian catalytic subunit of cAMP-dependent protein kinase were solved using molecular replacement methods starting from the refined structure of the recombinant catalytic subunit ternary complex (Zheng, J., et al., 1993a, Biochemistry 32, 2154-2161). These structures correspond to the free apoenzyme, a binary complex with an iodinated inhibitor peptide, and a ternary complex with both ATP and the unmodified inhibitor peptide. The apoenzyme and the binary complex crystallized in an open conformation, whereas the ternary complex crystallized in a closed conformation similar to the ternary complex of the recombinant enzyme. The model of the binary complex, refined at 2.9 A resolution, shows the conformational changes associated with the open conformation. These can be described by a rotation of the small lobe and a displacement of the C-terminal 30 residues. This rotation of the small lobe alters the cleft interface in the active-site region surrounding the glycine-rich loop and Thr 197, a critical phosphorylation site. In addition to the conformational changes, the myristylation site, absent in the recombinant enzyme, was clearly defined in the binary complex. The myristic acid binds in a deep hydrophobic pocket formed by four segments of the protein that are widely dispersed in the linear sequence. The N-terminal 40 residues that lie outside the conserved catalytic core are anchored by the N-terminal myristylate plus an amphipathic helix that spans both lobes and is capped by Trp 30. Both posttranslational modifications, phosphorylation and myristylation, contribute directly to the stable structure of this enzyme. |
==About this Structure== | ==About this Structure== | ||
| - | 1CMK is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa] with IOD and MYR as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Non-specific_serine/threonine_protein_kinase Non-specific serine/threonine protein kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.11.1 2.7.11.1] Full crystallographic information is available from [http:// | + | 1CMK is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa] with <scene name='pdbligand=IOD:'>IOD</scene> and <scene name='pdbligand=MYR:'>MYR</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Non-specific_serine/threonine_protein_kinase Non-specific serine/threonine protein kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.11.1 2.7.11.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CMK OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Sus scrofa]] | [[Category: Sus scrofa]] | ||
| - | [[Category: Eyck, L | + | [[Category: Eyck, L F.Ten.]] |
| - | [[Category: Knighton, D | + | [[Category: Knighton, D R.]] |
| - | [[Category: Sowadski, J | + | [[Category: Sowadski, J M.]] |
| - | [[Category: Taylor, S | + | [[Category: Taylor, S S.]] |
| - | [[Category: Xuong, N | + | [[Category: Xuong, N H.]] |
[[Category: Zheng, J.]] | [[Category: Zheng, J.]] | ||
[[Category: IOD]] | [[Category: IOD]] | ||
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[[Category: phosphotransferase]] | [[Category: phosphotransferase]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:07:35 2008'' |
Revision as of 10:07, 21 February 2008
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CRYSTAL STRUCTURES OF THE MYRISTYLATED CATALYTIC SUBUNIT OF CAMP-DEPENDENT PROTEIN KINASE REVEAL OPEN AND CLOSED CONFORMATIONS
Overview
Three crystal structures, representing two distinct conformational states, of the mammalian catalytic subunit of cAMP-dependent protein kinase were solved using molecular replacement methods starting from the refined structure of the recombinant catalytic subunit ternary complex (Zheng, J., et al., 1993a, Biochemistry 32, 2154-2161). These structures correspond to the free apoenzyme, a binary complex with an iodinated inhibitor peptide, and a ternary complex with both ATP and the unmodified inhibitor peptide. The apoenzyme and the binary complex crystallized in an open conformation, whereas the ternary complex crystallized in a closed conformation similar to the ternary complex of the recombinant enzyme. The model of the binary complex, refined at 2.9 A resolution, shows the conformational changes associated with the open conformation. These can be described by a rotation of the small lobe and a displacement of the C-terminal 30 residues. This rotation of the small lobe alters the cleft interface in the active-site region surrounding the glycine-rich loop and Thr 197, a critical phosphorylation site. In addition to the conformational changes, the myristylation site, absent in the recombinant enzyme, was clearly defined in the binary complex. The myristic acid binds in a deep hydrophobic pocket formed by four segments of the protein that are widely dispersed in the linear sequence. The N-terminal 40 residues that lie outside the conserved catalytic core are anchored by the N-terminal myristylate plus an amphipathic helix that spans both lobes and is capped by Trp 30. Both posttranslational modifications, phosphorylation and myristylation, contribute directly to the stable structure of this enzyme.
About this Structure
1CMK is a Protein complex structure of sequences from Homo sapiens and Sus scrofa with and as ligands. Active as Non-specific serine/threonine protein kinase, with EC number 2.7.11.1 Full crystallographic information is available from OCA.
Reference
Crystal structures of the myristylated catalytic subunit of cAMP-dependent protein kinase reveal open and closed conformations., Zheng J, Knighton DR, Xuong NH, Taylor SS, Sowadski JM, Ten Eyck LF, Protein Sci. 1993 Oct;2(10):1559-73. PMID:8251932
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