Structural divergence between the two subgroups of P5 ATPases
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Structural divergence between the two subgroups of P5 ATPases. / Sørensen, Danny Mollerup; Buch-Pedersen, Morten Jeppe; Palmgren, Michael Broberg.
In: BBA General Subjects, Vol. 1797, No. 6-7, 2010, p. 846-855.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Structural divergence between the two subgroups of P5 ATPases
AU - Sørensen, Danny Mollerup
AU - Buch-Pedersen, Morten Jeppe
AU - Palmgren, Michael Broberg
PY - 2010
Y1 - 2010
N2 - Evolution of P5 type ATPases marks the origin of eukaryotes but still they remain the least characterized pumps in the superfamily of P-type ATPases. Phylogenetic analysis of available sequences suggests that P5 ATPases should be divided into at least two subgroups, P5A and P5B. P5A ATPases have been identified in the endoplasmic reticulum and seem to have basic functions in protein maturation and secretion. P5B ATPases localize to vacuolar/lysosomal or apical membranes and in animals play a role in hereditary neuronal diseases. Here we have used a bioinformatical approach to identify differences in the primary sequences between the two subgroups. P5A and P5B ATPases appear have a very different membrane topology from other P-type ATPases with two and one, respectively, additional transmembrane segments inserted in the N-terminal end. Based on conservation of residues in the transmembrane region, the two P5 subgroups most likely have different substrate specificities although these cannot be predicted from their sequences. Furthermore, sequence differences between P5A and P5B ATPases are identified in the catalytic domains that could influence key kinetic properties differentially. Together these findings indicate that P5A and P5B ATPases are structurally and functionally different.
AB - Evolution of P5 type ATPases marks the origin of eukaryotes but still they remain the least characterized pumps in the superfamily of P-type ATPases. Phylogenetic analysis of available sequences suggests that P5 ATPases should be divided into at least two subgroups, P5A and P5B. P5A ATPases have been identified in the endoplasmic reticulum and seem to have basic functions in protein maturation and secretion. P5B ATPases localize to vacuolar/lysosomal or apical membranes and in animals play a role in hereditary neuronal diseases. Here we have used a bioinformatical approach to identify differences in the primary sequences between the two subgroups. P5A and P5B ATPases appear have a very different membrane topology from other P-type ATPases with two and one, respectively, additional transmembrane segments inserted in the N-terminal end. Based on conservation of residues in the transmembrane region, the two P5 subgroups most likely have different substrate specificities although these cannot be predicted from their sequences. Furthermore, sequence differences between P5A and P5B ATPases are identified in the catalytic domains that could influence key kinetic properties differentially. Together these findings indicate that P5A and P5B ATPases are structurally and functionally different.
U2 - 10.1016/j.bbabio.2010.04.010
DO - 10.1016/j.bbabio.2010.04.010
M3 - Journal article
C2 - 20416272
VL - 1797
SP - 846
EP - 855
JO - B B A - General Subjects
JF - B B A - General Subjects
SN - 0304-4165
IS - 6-7
ER -
ID: 33570116