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Expression and characterization of a magnetosome-associated protein, TPR-containing MAM22, in Escherichia coli
Abstract:
A magnetosome-associated protein, MAM22, contains a TPR domain (five TPR motifs and one putative TPR motif) that has been known to mediate protein-protein interactions. We expressed the mam22 gene in Escherichia coli and found that the purified MAM22 was reversibly self-aggregated by NaCl. The structural model of MAM22 which has been proposed on the basis of the crystal structure of the N-terminal TPR domain of a human Ser/Thr protein phosphatase suggests the novel hydrophobic colloidal features of MAM22 with TPR motifs.
Insights
Magnetosome protein MAM22, featuring a TPR domain, self-aggregates reversibly with NaCl. Its structure suggests novel hydrophobic colloidal properties, impacting protein interactions.
Area of Science:
- Microbiology
- Structural Biology
- Biochemistry
Background:
- Magnetosome-associated protein MAM22 contains a tetratricopeptide repeat (TPR) domain.
- TPR domains are known to mediate protein-protein interactions.
Purpose of the Study:
- To investigate the self-aggregation properties and structural features of MAM22.
- To explore the potential hydrophobic colloidal characteristics of MAM22.
Main Methods:
- The mam22 gene was expressed in Escherichia coli.
- Purified MAM22 protein was subjected to NaCl-induced aggregation studies.
- A structural model of MAM22 was proposed based on existing crystal structures.
Main Results:
- Purified MAM22 exhibited reversible self-aggregation in the presence of NaCl.
- The structural model indicated novel hydrophobic colloidal features associated with the TPR motifs of MAM22.
Conclusions:
- MAM22 possesses unique self-aggregation properties influenced by salt concentration.
- The structural insights suggest a role for MAM22 in hydrophobic interactions within magnetosomes.