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Delineating the Rules for Structural Adaptation of Membrane-Associated Proteins to Evolutionary Changes in Membrane Lipidome.

ABSTRACT: Membrane function is fundamental to life. Each species explores membrane lipid diversity within a genetically predefined range of possibilities. How membrane lipid composition in turn defines the functional space available for evolution of membrane-centered processes remains largely unknown. We address this fundamental question using related fission yeasts Schizosaccharomyces pombe and Schizosaccharomyces japonicus. We show that, unlike S. pombe that generates membranes where both glycerophospholipid acyl tails are predominantly 16-18 carbons long, S. japonicus synthesizes unusual "asymmetrical" glycerophospholipids where the tails differ in length by 6-8 carbons. This results in stiffer bilayers with distinct lipid packing properties. Retroengineered S. pombe synthesizing the S.-japonicus-type phospholipids exhibits unfolded protein response and downregulates secretion. Importantly, our protein sequence comparisons and domain swap experiments support the hypothesis that transmembrane helices co-evolve with membranes, suggesting that, on the evolutionary scale, changes in membrane lipid composition may necessitate extensive adaptation of the membrane-associated proteome.

SUBMITTER: Makarova M

PROVIDER: S-EPMC6997885 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:During the evolution of vertebrates, specific molecular innovations ensured adaptations which resulted in the split of different animal groups. Here comparative genomic analysis became a valued instrument to identify genes associated with the divergence of taxa and speciation events. Using this approach, we identified the association of the previously uncharacterized gene (mouse (1700011H14RIK, human C14ORF105/CCDC198), hereby named Kamp (Kidney-associated membrane protein) with the evolutionary split leading to birds and mammals. Furthermore, by comparing single nuclear polymorphisms of modern humans with Neandertals at the locus of Kamp, we identified gene-flow of Kamp from Neandertals into modern humans. Analyzing the expression of Kamp in humans revealed a restriction to the kidney, pancreas, and few other organs. A knockout of this gene in mice resulted in a structurally normal kidney as validated with micro-computed microtomography scans and single-cell transcriptomics, but with higher Albumin levels in the urine lower serum ferritin levels. Further, interactomics screening revealed an interaction between KAMP and ferritin (heavy chain), which was cross-validated by the analysis of co-localization of both proteins in vesicular and plasma membranes. The membranal localization of KAMP appeared regulated by its N-terminal myristoylation site, as KAMP became cytoplasmic in the absence of this specific sequence. Kamp knockout animals demonstrated increased body weight and decreased energy expenditure. This corresponded to Genome-Wide Association Studies of Kamp linked with higher BMI, diabetes-related pathologies, and macular degeneration in humans. Subsequent gain-of-function experiments showed altered proliferative dynamics and accumulation of KAMP during mitosis. Bioinformatics analysis indicated a protective role of KAMP in renal and liver cancer progression, as suggested by an association of KAMP with epithelial-to-mesenchymal transition and altered localization in tumors versus healthy tissue. Altogether, our results revealed several important roles played by KAMP in a vertebrate body, with specific emphasis on metabolite excretion and energy expenditure.

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Delineating the Rules for Structural Adaptation of Membrane-Associated Proteins to Evolutionary Changes in Membrane Lipidome.

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