NDLI: Functional Nonequivalence of Drosophila Actin Isoforms

Content Provider	Springer Nature Link
Author	Fyrberg, Eric A. Fyrberg, Christine C. Biggs, Joseph R. Saville, Donna Beall, Clifford J. Ketchum, Andrew
Copyright Year	1998
Abstract	We show that different Drosophila actinisoforms are not interchangeable. We sequenced the sixgenes that encode conventional Drosophilaactins and found that they specify amino acidreplacements in 27 of 376 positions. To test the significance ofthese changes we used directed mutagenesis to introduce10 such conversions, independently, into the Act88Fflight muscle-specific actin gene. We challenged these variant actins to replace the nativeprotein by transforming germline chromosomes of aDrosophila strain lacking flight muscle actin.Only one of the 10 reproducibly perturbed myofibrillarfunction, demonstrating that most isoform-specific aminoacid replacements are of minor significance. In order toestablish the consequences of multiple amino acidreplacements, we substituted portions of theDrosophila Act88F actin gene with correspondingregions of genes encoding other isoforms. Only one offive constructs tested engendered normally functioningflight muscles, and the severity of myofibrillar defects correlated with the number of replacementswithin the chimeric genes. Finally, we completelyconverted the flight muscle actin-encoding gene to onespecifying a nonmuscle isoform, a change entailing atotal of 18 amino acid replacements. Transformationof flies with this construct resulted in disruption offlight muscle structure and function. We conclude thatactin isoform sequences are not equivalent and that effects of the amino acid replacements,while minor individually, collectively confer uniqueproperties.
Starting Page	271
Ending Page	287
Page Count	17
File Format	PDF
ISSN	00062928
Journal	Biochemical Genetics
Volume Number	36
Issue Number	7-8
e-ISSN	15734927
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1998-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Human Genetics Medical Microbiology Biochemistry Zoology
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Biochemistry Molecular Biology Ecology, Evolution, Behavior and Systematics

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