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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