2dpx
From Proteopedia
(New page: 200px<br /> <applet load="2dpx" size="450" color="white" frame="true" align="right" spinBox="true" caption="2dpx, resolution 1.80Å" /> '''Crystal Structure o...) |
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caption="2dpx, resolution 1.80Å" /> | caption="2dpx, resolution 1.80Å" /> | ||
'''Crystal Structure of human Rad GTPase'''<br /> | '''Crystal Structure of human Rad GTPase'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Rad (Ras associated with diabetes) is an RGK-family small GTPase that is | + | Rad (Ras associated with diabetes) is an RGK-family small GTPase that is over-expressed in the skeletal muscle of humans with type II diabetes. Unlike other small GTPases, RGK family members including Rad lack several conserved residues in the GTPase domain. Here, we report the crystal structure of the GTPase domain of human Rad in the GDP-bound form at 1.8 A resolution. The structure revealed unexpected disordered structures of both switches I and II. We showed that the conformational flexibility of both switches is caused by non-conservative substitutions in the G2 and G3 motifs forming the switch cores together with other substitutions in the structural elements interacting with the switches. Glycine-rich sequences of the switches would also contribute to the flexibility. Switch I lacks the conserved phenylalanine that makes non-polar interactions with the guanine base in H-Ras. Instead, water-mediated hydrogen bonding interactions were observed in Rad. The GDP molecule is located at the same position as in H-Ras and adopts a similar conformation as that bound in H-Ras. This similarity seems to be endowed by the conserved hydrogen bonding interactions with the guanine base-recognition loops and the magnesium ion that has a typical octahedral coordination shell identical to that in H-Ras. |
==Disease== | ==Disease== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2DPX is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with MG and GDP as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Small_monomeric_GTPase Small monomeric GTPase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.6.5.2 3.6.5.2] Full crystallographic information is available from [http:// | + | 2DPX is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=MG:'>MG</scene> and <scene name='pdbligand=GDP:'>GDP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Small_monomeric_GTPase Small monomeric GTPase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.6.5.2 3.6.5.2] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2DPX OCA]. |
==Reference== | ==Reference== | ||
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[[Category: small-g]] | [[Category: small-g]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:01:24 2008'' |
Revision as of 15:01, 21 February 2008
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Crystal Structure of human Rad GTPase
Contents |
Overview
Rad (Ras associated with diabetes) is an RGK-family small GTPase that is over-expressed in the skeletal muscle of humans with type II diabetes. Unlike other small GTPases, RGK family members including Rad lack several conserved residues in the GTPase domain. Here, we report the crystal structure of the GTPase domain of human Rad in the GDP-bound form at 1.8 A resolution. The structure revealed unexpected disordered structures of both switches I and II. We showed that the conformational flexibility of both switches is caused by non-conservative substitutions in the G2 and G3 motifs forming the switch cores together with other substitutions in the structural elements interacting with the switches. Glycine-rich sequences of the switches would also contribute to the flexibility. Switch I lacks the conserved phenylalanine that makes non-polar interactions with the guanine base in H-Ras. Instead, water-mediated hydrogen bonding interactions were observed in Rad. The GDP molecule is located at the same position as in H-Ras and adopts a similar conformation as that bound in H-Ras. This similarity seems to be endowed by the conserved hydrogen bonding interactions with the guanine base-recognition loops and the magnesium ion that has a typical octahedral coordination shell identical to that in H-Ras.
Disease
Known disease associated with this structure: Breast cancer, susceptibility to OMIM:[179617]
About this Structure
2DPX is a Single protein structure of sequence from Homo sapiens with and as ligands. Active as Small monomeric GTPase, with EC number 3.6.5.2 Full crystallographic information is available from OCA.
Reference
Crystal structure of human Rad GTPase of the RGK-family., Yanuar A, Sakurai S, Kitano K, Hakoshima T, Genes Cells. 2006 Aug;11(8):961-8. PMID:16866878
Page seeded by OCA on Thu Feb 21 17:01:24 2008
Categories: Homo sapiens | Single protein | Small monomeric GTPase | Hakoshima, T. | Kitano, K. | Sakurai, S. | Yanuar, A. | GDP | MG | Diabetes | Gtpase | Rad | Rgk | Signal transduction | Small-g
