Crystallization and preliminary crystallographic analysis of the C-terminal domain of MamM, a magnetosome-associated protein from Magnetospirillum gryphiswaldense MSR-1

Abstract

MamM is a unique magnetosome-associated protein that shares substantial homology with cation diffusion facilitator (CDF) proteins, a group of heavy-metal-ion efflux transporters that participate in metal-ion homeostasis in all domains of life. Magnetotactic bacteria utilize CDF proteins in iron-oxide biomineralization and in magnetosome formation. Here, the crystallization and preliminary X-ray analysis of recombinant Magnetospirillum gryphiswaldense MamM is reported. The C-terminal domain of MamM was crystallized in the orthorhombic space group C222(1), with unit-cell parameters a = 37.1, b = 94.0, c = 53.3 Å. X-ray diffraction data were collected to a resolution of 2.0 Å.

Figure 1

Micrograph of a crystal of MamM-CTD from M. gryphiswaldense MSR-1. Crystal dimensions are 98 × 142 × 310 µm.