MreBCD cell shape-determining complex: Three proteins involved in Streptomyces coeicolor spore cell wall synthesis to form the thickened septum (relative to the vegegative cell wall).  MreB is 342 aas long with possibly 1 TMS at about residue 180, a second protein, MreC, which is 366 residues long with possibly 3 TMSs, one N-terminal, one at about residue 160, and one at about residue 280, and  MreD, which is 223 aas long and has 5 TMSs.  This system has been characterized (Sigle et al. 2015; Vollmer et al. 2019).  MreB gives a TC BLAST score of e-128; MreC gives a TC BLAST score of e-10, and MreD give a TC BLAST score of 0.0001 all with 9.B.157.1.4, showing that all 3 protein constituents are homology with other members of the family, but with greatly differing degrees of sequence similarities.  MreD with 5 TMSs gives a TC BLAST score of 0.0004 with T# 3.A.1.28.2, suggesting a relationship with an ABC-type membrane transport protein.