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PMID: 2109188 Published · ppublish English Comparative Study Journal Article

SAS1 and SAS2, GTP-binding protein genes in Dictyostelium discoideum with sequence similarities to essential genes in Saccharomyces cerevisiae.

Molecular and cellular biology ·Vol. 10 ·No. 5 ·1990-05-00 ·Pages 2367-78

Saxe SA, Kimmel AR

Abstract

We have identified two novel, very closely related genes, SAS1 and SAS2, from Dictyostelium discoideum. These encode small, approximately 20-kilodaton proteins with amino acid sequences thought to be involved in interaction with guanine nucleotides. The protein sizes, spacings of GTP-binding domains, and carboxyl-terminal sequences suggest their relationship to the ubiquitous ras-type proteins. Their sequences, however, are sufficiently different to indicate that they are not true ras proteins. More extensive sequence identity (approximately 55%) is shared with the YPT1 and SEC4 proteins from Saccharomyces cerevisiae. These yeast proteins are essential for growth and are believed to be involved in intracellular signaling associated with membrane function. SAS1 and SAS2 exhibit distinct patterns of genomic organization and developmentally regulated gene expression. SAS1 contains introns and is associated with a developmentally regulated repetitive element. SAS2 is colinear with its mRNA and does not appear to be closely linked with this repetitive element. Both genes are expressed during growth and throughout development. SAS1 is maximally expressed during cytodifferentiation, when two sizes of SAS1 mRNA are detectable. SAS2 mRNA levels are maximal during culmination. On the basis of the expression patterns of the SAS genes and their relationship to the YPT1 and SEC4 genes, we discuss possible functions of the SAS proteins.

MeSH Terms
Amino Acid Sequence Base Sequence Blotting, Southern Dictyostelium/genetics GTP-Binding Proteins/genetics Gene Expression Genes, Fungal Molecular Sequence Data Multigene Family Oligonucleotide Probes Polymerase Chain Reaction RNA, Fungal/genetics RNA, Messenger/genetics Restriction Mapping Saccharomyces cerevisiae/genetics
Chemicals
Oligonucleotide Probes RNA, Fungal RNA, Messenger GTP-Binding Proteins
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Saxe S A
Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Digestive and Kidney Diseases (6/B1-12), Bethesda, Maryland 20892.
Kimmel A R
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Article Info
Journal
Molecular and cellular biology
Abbr.
Mol Cell Biol
ISSN
0270-7306
DOI
10.1128/mcb.10.5.2367-2378.1990
Published
1990-05-00
Pages
2367-78
Language
English
Region
United States
NLM ID
8109087
PMCID
PMC360585
Subset
IM
Databases
GENBANK
M34456, M34457
External Links
PubMed source DOI: 10.1128/mcb.10.5.2367-2378.1990 PMC Full Text View journal details
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