Genome-wide analysis of major intrinsic proteins in the tree plant Populus trichocarpa: Characterization of XIP subfamily of aquaporins from evolutionary perspective

Table 7 Analysis of loops C and D in MIPs from different organism groups

MIP Subfamily	No. of sequences	Length of the loop C	Loops with ≥ 3 Gly	Length of loop D	No. of basic residues in loop D
Dicot XIP1s	18	33	All dicot, XIPs	15 -- 16	≥ 3 (19 out of 22)
Dicot XIP2s	4	25
Moss XIPs	3	31 -- 34	All	12-16	1 (2 out of 3)
Fungi XIPs	9	20 -- 23	All	16	2 (8 out of 9)
All PIPs	54	21 -- 22	53 out of 54	13 -- 14	4 (53 out of 54)
All TIPs	49	17	40 out of 49	9 -- 11	2 (41 out of 49)
All NIPs	37	16 -- 24	12 out of 37	8 -- 9	1 (32 out of 37)
All SIPs	14	14-19	None	8 -- 9	2 (10 out of 14)
Human glycerol transporting AQPs^a	4	35	All	10	0 (2 out of 4) 2 (2 out of 4)
Other Human AQPs^b	9	20-23	AQP1, AQP4	5 -- 9	2 basic (7 out of 9)

ISSN: 1471-2229