Molecular Cloning of Two Types of GAP Complementary DNA from Human Placenta
SciencePublished 23 December 1988
Meg Trahey, Gail A. Wong, Robert Halenbeck, Bonnee Rubinfeld, George A. Martin, Martha Ladner
Citations489
SJR quartileQ1
SJR score10.42
SNIP6.62
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TL;DR
The ras p21 GTPase-activating protein (GAP) was purified from human placental tissue and internal amino acid sequence was obtained and, by means of this sequence, two types of complementary DNA clones were isolated and characterized.
Abstract
The ras p21 GTPase-activating protein (GAP) was purified from human placental tissue. Internal amino acid sequence was obtained from this 120,000-dalton protein and, by means of this sequence, two types of complementary DNA clones were isolated and characterized. One type encoded GAP with a predicted molecular mass of 116,000 daltons and 96% identity with bovine GAP. The messenger RNA of this GAP was detected in human lung, brain, liver, leukocytes, and placenta. The second type appeared to be generated by a differential splicing mechanism and encoded a novel form of GAP with a predicted molecular mass of 100,400 daltons. This protein lacks the hydrophobic amino terminus characteristic of the larger species, but retains GAP activity. The messenger RNA of this type was abundantly expressed in placenta and in several human cell lines, but not in adult tissues.
Keywords
Biochemistry, Genetics and Molecular Biology
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