1HWU

STRUCTURE OF PII PROTEIN FROM HERBASPIRILLUM SEROPEDICAE

Summary for 1HWU

• Entry DOI: 10.2210/pdb1hwu/pdb
• Related: 2PII
• Descriptor: PII PROTEIN (2 entities in total)
• Functional Keywords: herbaspirillum seropedicae pii, beta-alpha-beta motif, signal transduction protein, signaling protein
• Biological source: Herbaspirillum seropedicae
• Total number of polymer chains: 6
• Total formula weight: 73705.13

Authors

Benelli, E.M.,Buck, M.,Polikarpov, I.,De Souza, E.M.,Cruz, L.M.,Pedrosa, F.O. (deposition date: 2001-01-10, release date: 2003-06-17, Last modification date: 2023-08-09)

Primary citation

Machado Benelli, E.,Buck, M.,Polikarpov, I.,Maltempi de Souza, E.,Cruz, L.M.,Pedrosa, F.O.
Herbaspirillum seropedicae signal transduction protein PII is structurally similar to the enteric GlnK.
Eur.J.Biochem., 269:3296-3303, 2002

PubMed Abstract: PII-like proteins are signal transduction proteins found in bacteria, archaea and eukaryotes. They mediate a variety of cellular responses. A second PII-like protein, called GlnK, has been found in several organisms. In the diazotroph Herbaspirillum seropedicae, PII protein is involved in sensing nitrogen levels and controlling nitrogen fixation genes. In this work, the crystal structure of the unliganded H. seropedicae PII was solved by X-ray diffraction. H. seropedicae PII has a Gly residue, Gly108 preceding Pro109 and the main-chain forms a beta turn. The glycine at position 108 allows a bend in the C-terminal main-chain, thereby modifying the surface of the cleft between monomers and potentially changing function. The structure suggests that the C-terminal region of PII proteins may be involved in specificity of function, and nonenteric diazotrophs are found to have the C-terminal consensus XGXDAX(107-112). We are also proposing binding sites for ATP and 2-oxoglutarate based on the structural alignment of PII with PII-ATP/GlnK-ATP, 5-carboxymethyl-2-hydroxymuconate isomerase and 4-oxalocrotonate tautomerase bound to the inhibitor 2-oxo-3-pentynoate.

PubMed: 12084071
DOI: 10.1046/j.1432-1033.2002.03011.x

Experimental method

X-RAY DIFFRACTION (2.1 Å)