TY - JOUR
T1 - Expression, purification, crystallization and preliminary X-ray diffraction analysis of the apo form of InsP 5 2-K from Arabidopsis thaliana
AU - Bãos-Sanz, Jose Ignacio
AU - Sanz-Aparicio, Julia
AU - Brearley, Charles A.
AU - González, Beatriz
PY - 2012/5/1
Y1 - 2012/5/1
N2 - Inositol 1,3,4,5,6-pentakisphosphate 2-kinase (IP 5 2-K) is a key enzyme that catalyzes the synthesis of phytic acid (IP 6) from inositol 1,3,4,5,6-pentakisphos-phate (IP 5) and ATP. The first structure of IP 5 2-K, that from Arabidopsis thaliana, has been solved previously; it only crystallized in the presence of inositol, either the substrate IP 5 or the product IP 6, and failed to crystallize in its free state (without inositol). Based on structural analysis, a point mutation of IP5 2-K (W129A) has been produced in order to overcome this limitation and obtain information about protein conformational changes upon substrate binding. Here, the production and crystallization of W129A IP 5 2-K in its free state and with bound nucleotide is described. These crystals differed from the native crystals and belonged to the orthorhombic space group P2 12 12, with unit-cell parameters a = 66.00, b = 68.23, c = 105.80 Å and a = 63.06, b = 71.80, c = 100.23 Å, respectively. The crystals diffracted to resolutions of 2.22 Å (apo) and 2.05 Å (nucleotide bound) using synchrotron radiation and contained one molecule per asymmetric unit. The structures have been determined using the molecular-replacement method and refinement is being undertaken.
AB - Inositol 1,3,4,5,6-pentakisphosphate 2-kinase (IP 5 2-K) is a key enzyme that catalyzes the synthesis of phytic acid (IP 6) from inositol 1,3,4,5,6-pentakisphos-phate (IP 5) and ATP. The first structure of IP 5 2-K, that from Arabidopsis thaliana, has been solved previously; it only crystallized in the presence of inositol, either the substrate IP 5 or the product IP 6, and failed to crystallize in its free state (without inositol). Based on structural analysis, a point mutation of IP5 2-K (W129A) has been produced in order to overcome this limitation and obtain information about protein conformational changes upon substrate binding. Here, the production and crystallization of W129A IP 5 2-K in its free state and with bound nucleotide is described. These crystals differed from the native crystals and belonged to the orthorhombic space group P2 12 12, with unit-cell parameters a = 66.00, b = 68.23, c = 105.80 Å and a = 63.06, b = 71.80, c = 100.23 Å, respectively. The crystals diffracted to resolutions of 2.22 Å (apo) and 2.05 Å (nucleotide bound) using synchrotron radiation and contained one molecule per asymmetric unit. The structures have been determined using the molecular-replacement method and refinement is being undertaken.
KW - inositol kinases
KW - inositol phosphate
KW - IP 2-K
KW - IP
KW - phytic acid
UR - http://www.scopus.com/inward/record.url?scp=84862183479&partnerID=8YFLogxK
U2 - 10.1107/S1744309112017307
DO - 10.1107/S1744309112017307
M3 - Article
C2 - 22684075
AN - SCOPUS:84862183479
SN - 1744-3091
VL - 68
SP - 701
EP - 704
JO - Acta Crystallographica Section F: Structural Biology and Crystallization Communications
JF - Acta Crystallographica Section F: Structural Biology and Crystallization Communications
IS - 6
ER -