. 2021 Sep 28;22(19):10478. doi: 10.3390/ijms221910478

Table 2.

Summary of the functional StMTPs.

StMTPs	Similar Functions to Model Plants	Structure Domain (HXXXD or DXXXXD)	Zinc-Rich Area	ZT_Dimer	Signal Peptide	Improve Yeast Cadmium Tolerance
StMTP2	Forms dimers with StMTP4 to transport Zn²⁺	HXXXD not exists on TMD2 or/and TMD5	Yes	No	No	-
StMTP4	Forms dimers with StMTP2 to transport Zn²⁺	HXXXD not exists on TMD2 or/and TMD5	No	No	No	-
StMTP5	Transport the heavy metals	DXXXD exists on TMD2 and TMD5	No	Yes	No	-
StMTP8	Transport Zn²⁺	HXXXD not exists on TMD2 or/and TMD5	Yes	No	Yes	High tolerance; high accumulation
StMTP9	Transport Mn²⁺	DXXXD exists on TMD2	No	Yes	No	High tolerance; low accumulation