4CL2

structure of periplasmic metal binding protein from candidatus liberibacter asiaticus

Summary for 4CL2

• Entry DOI: 10.2210/pdb4cl2/pdb
• Descriptor: PERIPLASMIC SOLUTE BINDING PROTEIN, SULFATE ION, ACETATE ION, ... (6 entities in total)
• Functional Keywords: transport protein
• Biological source: CANDIDATUS LIBERIBACTER ASIATICUS
• Total number of polymer chains: 1
• Total formula weight: 31830.65

Authors

Sharma, N.,Selvakumar, P.,Bhose, S.,Ghosh, D.K.,Kumar, P.,Sharma, A.K. (deposition date: 2014-01-11, release date: 2015-01-28, Last modification date: 2023-12-20)

Primary citation

Sharma, N.,Selvakumar, P.,Bhose, S.,Ghosh, D.K.,Kumar, P.,Sharma, A.K.
Crystal Structure of a Periplasmic Solute Binding Protein in Metal-Free, Intermediate and Metal-Bound States from Candidatus Liberibacter Asiaticus.
J.Struct.Biol., 189:184-, 2015

PubMed Abstract: The Znu system, a member of ABC transporter family, is critical for survival and pathogenesis of Candidatus Liberibacter asiaticus (CLA). Two homologues of this system have been identified in CLA. Here, we report high resolution crystal structure of a periplasmic solute binding protein from second of the two gene clusters of Znu system in CLA (CLas-ZnuA2) in metal-free, intermediate and metal-bound states. CLas-ZnuA2 showed maximum sequence identity to the Mn/Fe-specific solute binding proteins (SBPs) of cluster A-I family. The overall fold of CLas-ZnuA2 is similar to the related cluster A-I family SBPs. The sequence and structure analysis revealed the unique features of CLas-ZnuA2. The comparison of CLas-ZnuA2 structure in three states showed that metal binding and release is facilitated by a large displacement along with a change in orientation of the side chain for one of the metal binding residue (His39) flipped away from metal binding site in metal-free form. The crystal structure captured in intermediate state of metal binding revealed the changes in conformation and interaction of the loop hosting His39 during the metal binding. A rigid body movement of C-domain along with partial unfolding of linker helix at its C-terminal during metal binding, as reported for PsaA, was not observed in CLas-ZnuA2. The present results suggest that despite showing maximum sequence identity to the Mn/Fe-specific SBPs, the mechanistic resemblance of CLas-ZnuA2 seems to be closer to Zn-specific SBPs of cluster A-I family.

PubMed: 25641618
DOI: 10.1016/J.JSB.2015.01.012

Experimental method

X-RAY DIFFRACTION (1.63 Å)