Biomaterial Database

Isolation and characterization of IPP, a novel human gene encoding an actin-binding, kelch-like protein. 1999

I F Kim, and E Mohammadi, and R C Huang

The Johns Hopkins University, Department of Biology, 3400 North Charles Street, Baltimore, MD 21218, USA.

The kelch family of proteins is defined by a 50 amino-acid repeat that has been shown to associate with actin. Here we describe the cloning and initial characterization of IPP, a novel human gene that predicts a kelch family protein homologous to the mouse Ipp gene, a previously described kelch family member. A 3kb IPP cDNA clone was isolated from a human placenta library using a probe derived from Ipp. Restriction mapping and Southern blot analysis show that IPP comprises eight exons spanning more than 47kb of genomic DNA. Fluorescence in situ hybridization maps the gene to chromosome 1p32-1p34. Northern blot analysis reveals transcripts of 1.4, 2.2, 5. 0, and 7.3kb. The 1.4 and 2.2kb messages are found exclusively in testis, while the 5.0 and 7.3kb messages are expressed at varying levels in ovary, placenta, small intestine, spleen, testis, and thymus. The IPP cDNA clone contains a 1752bp open reading frame that predicts a 584 amino-acid, 66kDa protein. Sequence analysis indicates an N-terminal POZ protein-protein interaction domain and a C-terminal kelch repeat domain consisting of six tandemly arranged repeats. Cosedimentation assays performed with these domains expressed as glutathione S-transferase fusion proteins demonstrate an actin-binding activity mediated specifically by the kelch repeat domain of IPP.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008840	Microfilament Proteins	Monomeric subunits of primarily globular ACTIN and found in the cytoplasmic matrix of almost all cells. They are often associated with microtubules and may play a role in cytoskeletal function and/or mediate movement of the cell or the organelles within the cell.	Actin Binding Protein,Actin-Binding Protein,Actin-Binding Proteins,Microfilament Protein,Actin Binding Proteins,Binding Protein, Actin,Protein, Actin Binding,Protein, Actin-Binding,Protein, Microfilament,Proteins, Actin-Binding,Proteins, Microfilament
D008969	Molecular Sequence Data	Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.	Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D011257	Pregnancy Proteins	Proteins produced by organs of the mother or the PLACENTA during PREGNANCY. These proteins may be pregnancy-specific (present only during pregnancy) or pregnancy-associated (present during pregnancy or under other conditions such as hormone therapy or certain malignancies.)	Placental Proteins,Proteins, Placental,Proteins, Pregnancy
D011485	Protein Binding	The process in which substances, either endogenous or exogenous, bind to proteins, peptides, enzymes, protein precursors, or allied compounds. Specific protein-binding measures are often used as assays in diagnostic assessments.	Plasma Protein Binding Capacity,Binding, Protein
D012091	Repetitive Sequences, Nucleic Acid	Sequences of DNA or RNA that occur in multiple copies. There are several types: INTERSPERSED REPETITIVE SEQUENCES are copies of transposable elements (DNA TRANSPOSABLE ELEMENTS or RETROELEMENTS) dispersed throughout the genome. TERMINAL REPEAT SEQUENCES flank both ends of another sequence, for example, the long terminal repeats (LTRs) on RETROVIRUSES. Variations may be direct repeats, those occurring in the same direction, or inverted repeats, those opposite to each other in direction. TANDEM REPEAT SEQUENCES are copies which lie adjacent to each other, direct or inverted (INVERTED REPEAT SEQUENCES).	DNA Repetitious Region,Direct Repeat,Genes, Selfish,Nucleic Acid Repetitive Sequences,Repetitive Region,Selfish DNA,Selfish Genes,DNA, Selfish,Repetitious Region, DNA,Repetitive Sequence,DNA Repetitious Regions,DNAs, Selfish,Direct Repeats,Gene, Selfish,Repeat, Direct,Repeats, Direct,Repetitious Regions, DNA,Repetitive Regions,Repetitive Sequences,Selfish DNAs,Selfish Gene
D002352	Carrier Proteins	Proteins that bind or transport specific substances in the blood, within the cell, or across cell membranes.	Binding Proteins,Carrier Protein,Transport Protein,Transport Proteins,Binding Protein,Protein, Carrier,Proteins, Carrier
D002874	Chromosome Mapping	Any method used for determining the location of and relative distances between genes on a chromosome.	Gene Mapping,Linkage Mapping,Genome Mapping,Chromosome Mappings,Gene Mappings,Genome Mappings,Linkage Mappings,Mapping, Chromosome,Mapping, Gene,Mapping, Genome,Mapping, Linkage,Mappings, Chromosome,Mappings, Gene,Mappings, Genome,Mappings, Linkage
D002878	Chromosomes, Human, Pair 1	A specific pair of human chromosomes in group A (CHROMOSOMES, HUMAN, 1-3) of the human chromosome classification.	Chromosome 1
D003598	Cytoskeletal Proteins	Major constituent of the cytoskeleton found in the cytoplasm of eukaryotic cells. They form a flexible framework for the cell, provide attachment points for organelles and formed bodies, and make communication between parts of the cell possible.	Proteins, Cytoskeletal