Article abstract
Nature Structural & Molecular Biology 15, 619 - 625 (2008)
Published online: 25 May 2008 | doi:10.1038/nsmb.1431
Crystal structure of the aquaglyceroporin PfAQP from the malarial parasite Plasmodium falciparum
Zachary E R Newby1, Joseph O'Connell III1, Yaneth Robles-Colmenares1, Shahram Khademi1,2, Larry J Miercke1 & Robert M Stroud1
Abstract
The 2.05-Å resolution structure of the aquaglyceroporin from the malarial parasite Plasmodium falciparum (PfAQP), a protein important in the parasite's life cycle, has been solved. The structure provides key evidence for the basis of water versus glycerol selectivity in aquaporin family members. Unlike its closest homolog of known structure, GlpF, the channel conducts both glycerol and water at high rates, framing the question of what determines high water conductance in aquaporin channels. The universally conserved arginine in the selectivity filter is constrained by only two hydrogen bonds in GlpF, whereas there are three in all water-selective aquaporins and in PfAQP. The decreased cost of dehydrating the triply-satisfied arginine cation may provide the basis for high water conductance. The two Asn-Pro-Ala (NPA) regions of PfAQP, which bear rare substitutions to Asn-Leu-Ala (NLA) and Asn-Pro-Ser (NPS), participate in preserving the orientation of the selectivity filter asparagines in the center of the channel.
- Department of Chemistry and Chemical Biology Graduate Program, and Department of Biochemistry and Biophysics, Genentech Hall, School of Medicine, University of California in San Francisco, 600 16th Street, San Francisco, California 94158-2517, USA.
- Present address: Department of Molecular Physiology and Biophysics, Carver College of Medicine, University of Iowa, 4-610 Bowen Science Building, Iowa City, Iowa 52242-1109, USA.
Correspondence to: Robert M Stroud1 e-mail: stroud@msg.ucsf.edu
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