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Table 3 Conservation of small and weakly polar residues at the helix-helix interfaces of plant MIP proteins

From: Homology modeling of major intrinsic proteins in rice, maize and Arabidopsis: comparative analysis of transmembrane helix association and aromatic/arginine selectivity filters

Residuea

All families b, c

PIPsc

TIPsc

NIPsc

SIPsc

T48

T(93), A, S ( 97% )

T(100) ( 100% )

T(94) ( 94% )

T(92), S ( 96% )

T(63), A(25), S ( 100% )

T55

G(39), T(35), A ( 93% )

T(85), S ( 100% )

G(78), A ( 100% )

G(50), T, A ( 81% )

G(38), S(25), A ( 75% )

A78

A(77), S, C, T ( 93% )

A(95), S ( 98% )

A(88), S ( 100% )

A(62), C, S ( 96% )

T(38) ( 38% )

G82

G(63), A(28), S, T ( 94% )

G(100) ( 100% )

A(91), G, T ( 100% )

G(96) ( 96% )

S(38) ( 38% )

A103

A(88), S, T, C ( 96% )

A(100) ( 100% )

A(97) ( 97% )

A(85), S(15) ( 100% )

T(50), C ( 62% )

G107

G(61), A(32), S, T ( 100% )

G(97), A ( 100% )

G(78), A, S ( 100% )

A(77), T, S, G ( 100% )

A(100) ( 100% )

G129

G(90), A ( 100% )

G(100) ( 100%)

G(81), A ( 100% )

G(81), A ( 100% )

G(100) ( 100% )

A130

A(63), S(36), G ( 100% )

A(97), G ( 100% )

S(59), A(41) ( 100% )

S(65), A(35) ( 100% )

A(75), S(25) ( 100% )

G133

A(55), G(44) ( 99% )

G(97) ( 97% )

A(97), G ( 100% )

A(100) ( 100% )

G(88), A ( 100% )

T172

T(91), S, A ( 100% )

T(100) ( 100% )

T(97), A ( 100% )

T(73), S(27) ( 100% )

T(75), S(25) ( 100% )

S181

A(40), S(40), G, T ( 93% )

S(100) ( 100% )

A(84), S, T ( 94% )

A(58), G(35), S, T ( 100% )

T(25), G ( 38% )

G203

G(91), A, S ( 99% )

G(100) ( 100% )

G(100) ( 100% )

G(92), A ( 96% )

S(75), A(25) ( 100% )

S226

S(71), T, A ( 97% )

S(97), T ( 100% )

S(75), A ( 94% )

T(54), S(46) ( 100% )

A(88) ( 88% )

G248

G(78), A, S, C ( 100% )

G(100) ( 100% )

G(100) ( 100% )

A(50), G(38), S ( 100% )

C(38), A(25), S(25), G ( 100% )

G252

G(97), A ( 100% )

G(100) ( 100% )

G(100) ( 100% )

G(100) ( 100% )

G(62), A(38) ( 100% )

A253

A(66), G, T, S ( 97% )

A(97), G ( 100% )

G(72), A(25), S ( 100% )

A(69), T ( 88% )

A(62), T(38) ( 100% )

A256

A(71), G(27) ( 98% )

A(97) ( 97% )

A(100) ( 100% )

G(100) ( 100% )

A(62), G(25), S ( 100% )

  1. a Residue numbers correspond to that of the plant aquaporin SoPIP2;1 (PDB ID: 1Z98).
  2. b Conservation is reported for all MIP subfamilies from the structure-based sequence alignments of 105 MIP sequences from rice, maize and Arabidopsis.
  3. c Small and weakly polar interfacial residues in plant MIP sequences and their conservation (if it exceeds 25%) are given. If the conservation is less than 25%, only the residues are reported. Group conservation of small and weakly polar residues (Gly, Ala, Ser, Thr and Cys) is shown in bold and italics.