Table 1 Discriminatory key to classify indecisive isoforms.

Metal specificity

Fe

Mn

Amino acid length

199–229

200–316

Theoretical molecular weight

21–25 KDa

22–34 KDa

No. of a helix*

13

14

No. of b strand*

3

3

Domains

N & C terminal

N & C terminal

Motif

DVWEHAYY

DVWEHAYY

Active site residues*

Fig 3

Fig 4

Structurally highly conserved metal specific residues

F₁₈₄XXXA₁₈₈Q_189.......T_280......F/Y₃₀₃

R₁₈₄XXXG₁₈₈G_189.......G_280......W₃₀₃

Conserved residue with photosynthetic role

K87, K139

None

Transmembrane hydrophobic pocket

Absent

Present