title: Purification, crystallization and preliminary X-ray diffraction analysis of the yeast Sec12Deltap protein, a guanine nucleotide-exchange factor involved in vesicle transport.
abstract: Sec12 is a guanine nucleotide-exchange factor (GEF) of the GTP-binding protein Sar1. Its GEF activity on Sar1 makes it a key element in vesicle budding from the endoplasmic reticulum to the Golgi apparatus in yeast. Sec12 is an integral membrane glycoprotein of 70 kDa. A 38.5 kDa N-cytoplasmic domain (Sec12Deltap) has been expressed in Saccharomyces cerevisiae and in Escherichia coli, purified to homogeneity and crystallized. Two crystal forms were obtained. Crystal form I belongs to space group P6(2)/P6(4), with unit-cell parameters a = b = 191.7, c = 53.3 A, gamma = 120 degrees, and diffracts to 2.6 A resolution. Crystal form II belongs to space group P1, with unit-cell parameters a = 52.6, b = 53.0, c = 116.8 A, alpha = 98.0, beta = 97.4, gamma = 93.4 degrees, and diffracts to 2.0 A resolution.
authors.affiliation: ESRF, European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble CEDEX, France. dumon@esrf.fr
authors.forename: L
authors.initials: L
authors.lastname: Dumon-Seignovert
authors.forename: T
authors.initials: T
authors.lastname: Matsumuto
authors.forename: S
authors.initials: S
authors.lastname: Monaco-Malbet
authors.forename: T
authors.initials: T
authors.lastname: Tomizaki
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.forename: A
authors.initials: A
authors.lastname: Nakano
authors.forename: S
authors.initials: S
authors.lastname: Wakatsuki
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D005656:Fungal Proteins / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D020662:Guanine Nucleotide Exchange Factors / Q000737:chemistry* / Q000378:metabolism; D008562:Membrane Glycoproteins / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D011487:Protein Conformation; D012441:Saccharomyces cerevisiae / Q000737:chemistry*; D029701:Saccharomyces cerevisiae Proteins; D022161:Transport Vesicles / Q000378:metabolism
chemical_list: D005656:Fungal Proteins; D020662:Guanine Nucleotide Exchange Factors; D008562:Membrane Glycoproteins; C071239:SEC12 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins