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5.
Proteins ; 65(3): 777-82, 2006 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-16948158
6.
Proteins ; 65(3): 527-37, 2006 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-16988933

RESUMO

Glutathione S-transferases (GSTs) comprise a diverse superfamily of enzymes found in organisms from all kingdoms of life. GSTs are involved in diverse processes, notably small-molecule biosynthesis or detoxification, and are frequently also used in protein engineering studies or as biotechnology tools. Here, we report the high-resolution X-ray structure of Atu5508 from the pathogenic soil bacterium Agrobacterium tumefaciens (atGST1). Through use of comparative sequence and structural analysis of the GST superfamily, we identified local sequence and structural signatures, which allowed us to distinguish between different GST classes. This approach enables GST classification based on structure, without requiring additional biochemical or immunological data. Consequently, analysis of the atGST1 crystal structure suggests a new GST class, distinct from previously characterized GSTs, which would make it an attractive target for further biochemical studies.


Assuntos
Agrobacterium tumefaciens/enzimologia , Proteínas de Bactérias/química , Glutationa Transferase/química , Agrobacterium tumefaciens/química , Agrobacterium tumefaciens/citologia , Sequência de Aminoácidos , Proteínas de Bactérias/classificação , Cristalografia por Raios X , Dimerização , Glutationa Transferase/classificação , Modelos Moleculares , Dados de Sequência Molecular , Filogenia , Estrutura Secundária de Proteína
12.
Proteins ; 63(4): 1112-8, 2006 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-16544291
16.
J Struct Funct Genomics ; 6(2-3): 135-41, 2005.
Artigo em Inglês | MEDLINE | ID: mdl-16211510

RESUMO

The production of large numbers of highly purified proteins for X-ray crystallography is a significant bottleneck in structural genomics. At the Joint Center for Structural Genomics (JCSG; http://www.jcsg.org), specific automated protein expression, purification, and analytical methods are being utilized to study the proteome of Thermotoga maritima. Anion exchange and size exclusion chromatography (SEC), intended for the production of highly purified proteins, have been automated and the procedures are described here in detail. Analytical SEC has been included as a standard quality control test. A biological unit (BU) is the macromolecule that has been proven or is presumed to be functional. Correct assignment of BUs from protein structures can be difficult. BU predictions obtained via the Protein Quaternary Structure file server (PQS; http://pqs.ebi.ac.uk/) were compared to SEC data for 16 representative T. maritima proteins whose structures were solved at the JCSG, revealing an inconsistency in five cases. Herein, we report that SEC can be used to validate or disprove PQS-derived oligomeric models. A substantial amount of associated SEC and structural data should enable us to use certain PQS parameters to gauge the accuracy of these computational models and to generally improve their predictions.


Assuntos
Proteínas de Bactérias/química , Proteínas de Bactérias/isolamento & purificação , Biologia Computacional/métodos , Cristalografia por Raios X/métodos , Proteômica/métodos , Thermotoga maritima/genética , Cromatografia em Gel/métodos , Biologia Computacional/instrumentação , Conformação Proteica
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