Rab proteins

Ebook "Ras superfamily small G proteins: Biology and mechanisms 2 (Transport)" discusses subfamily proteins which function in molecular and vesicular transport mechanisms inside the cell. In this volume the focus lies on the Rab, Ran and Arf subfamily members. As in Volume 1, the book is written by international renowned scientists in the field of small G-proteins. In elaborate reviews, biochemistry, structure, function and G-protein - effector interactions are described. Together with Volume 1 this book provides an comprehensive state-of-the-art work on small G-proteins (GTPases).

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Transportation of pigment precursors or related metabolites from cytoplasm to subcellular pigment granules is one of the key steps in insect pigmentation and usually executed via such transporter proteins as the ATP-binding cassette (ABC) transmembrane transporters and small G-proteins (e.g. Rab protein).

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Rab proteins are GTPases responsible for intracellular vesicular trafficking regulation. Rab11 proteins, members of the Rab GTPase family, are known to regulate vesicular recycling during embryonic development. In zebrafish, there are 3 rab11 paralogues, known as rab11a, rab11ba and rab11bb, sharing high identity with each other.

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Rab proteins form the largest family of the Ras superfamily of small GTP-binding proteins and regulate intracellular trafficking pathways. However, the function of the Rab proteins in woody species is still an open question.

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GTP-binding proteins of the Rab family were cloned from human platelets using RT-PCR. Clones corresponding to twonovelRabproteins,Rab31 andRab32, and toRab11A, which had not been detected in platelets previously, were isolated. The coding sequence of Rab31(GenBank acces-sion no. U59877) corresponded to a 194 amino-acid protein of 21.6 kDa. TheRab32sequence was extended to 1000 nucleotides including 630 nucleotides of coding sequence (GenBank accession no.

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