The multigene family of the tobacco hornworm V-ATPase: novel subunits A, C, D, H, and putative isoforms
Autor(en): | Merzendorfer, H Reineke, S Zhao, XF Jacobmeier, B Harvey, WR Wieczorek, H |
Stichwörter: | ANIMAL PLASMA-MEMBRANE; Biochemistry & Molecular Biology; Biophysics; CLONING; ELECTRON-MICROSCOPY; isoform; Manduca sexta; MANDUCA-SEXTA MIDGUT; midgut; MOLECULAR CHARACTERIZATION; multigene family; POLYMERASE CHAIN-REACTION; PROTON-TRANSLOCATING ATPASE; PUMP; SACCHAROMYCES-CEREVISIAE; V-ATPase; vacuolar H+-translocating ATPase; VACUOLAR-TYPE ATPASE | Erscheinungsdatum: | 2000 | Herausgeber: | ELSEVIER SCIENCE BV | Journal: | BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES | Volumen: | 1467 | Ausgabe: | 2 | Startseite: | 369 | Seitenende: | 379 | Zusammenfassung: | The plasma membrane V-ATPase from Manduca sexta (Lepidoptera, Sphingidae) larval midgut is composed of at least 12 subunits, eight of which have already been identified molecularly [Wieczorek et al., J. Bioenerg. Biomembr. 31 (1999) 67-74]. Here we report primary sequences of subunits C, D, H and a, which previously had not been identified in insects. Expression of recombinant proteins, immunostaining and protein sequencing demonstrated that the corresponding proteins are subunits of the Manduca V-ATPase. Genomic Southern blot analysis indicated the existence of multiple genes encoding subunits G, a, c, d and e. Moreover. multiple transcripts were detected in Northern blots from midgut poly(A) RNA for subunits B, G, c and d. Thus, these polypeptides appear to exist as multiple isoforms that could be expressed either in different tissues or at distinct locations within a cell. By contrast subunits A, C, D, E, F and Fl appear to be encoded by single transcripts and therefore should be present in any Manduca V-ATPase, independent of its subcellular or cell specific origin. (C) 2000 Elsevier Science B.V. All rights reserved. |
ISSN: | 00052736 | DOI: | 10.1016/S0005-2736(00)00233-9 |
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geprüft am 13.05.2024