View source for 521p

[[Image:521p.gif|left|200px]]

 {{Structure
|PDB= 521p |SIZE=350|CAPTION= <scene name='initialview01'>521p</scene>, resolution 2.6&Aring;
|SITE= 
|LIGAND= <scene name='pdbligand=GTP:GUANOSINE-5&#39;-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>
|ACTIVITY= 
|GENE= 
|DOMAIN=
|RELATEDENTRY=
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=521p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=521p OCA], [http://www.ebi.ac.uk/pdbsum/521p PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=521p RCSB]</span>
}}

'''THREE-DIMENSIONAL STRUCTURES OF H-RAS P21 MUTANTS: MOLECULAR BASIS FOR THEIR INABILITY TO FUNCTION AS SIGNAL SWITCH MOLECULES'''


==Overview==
The X-ray structures of the guanine nucleotide binding domains (amino acids 1-166) of five mutants of the H-ras oncogene product p21 were determined. The mutations described are Gly-12----Arg, Gly-12----Val, Gln-61----His, Gln-61----Leu, which are all oncogenic, and the effector region mutant Asp-38----Glu. The resolutions of the crystal structures range from 2.0 to 2.6 A. Cellular and mutant p21 proteins are almost identical, and the only significant differences are seen in loop L4 and in the vicinity of the gamma-phosphate. For the Gly-12 mutants the larger side chains interfere with GTP binding and/or hydrolysis. Gln-61 in cellular p21 adopts a conformation where it is able to catalyze GTP hydrolysis. This conformation has not been found for the mutants of Gln-61. Furthermore, Leu-61 cannot activate the nucleophilic water because of the chemical nature of its side chain. The D38E mutation preserves its ability to bind GAP.

==About this Structure==
521P is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=521P OCA]. 

==Reference==
Three-dimensional structures of H-ras p21 mutants: molecular basis for their inability to function as signal switch molecules., Krengel U, Schlichting I, Scherer A, Schumann R, Frech M, John J, Kabsch W, Pai EF, Wittinghofer A, Cell. 1990 Aug 10;62(3):539-48. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/2199064 2199064]
[[Category: Homo sapiens]]
[[Category: Single protein]]
[[Category: Kabsch, W.]]
[[Category: Krengel, U.]]
[[Category: Pai, E F.]]
[[Category: Schlichting, I.]]
[[Category: Wittinghofer, A.]]
[[Category: oncogene protein]]

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