Human guanylate kinase (GUK1): cDNA sequence, expression and chromosomal localisation.

Guanylate kinase (GK) catalyses the conversion of GMP to GTP as part of the cGMP cycle. In mammalian phototransduction, this cycle is essential for the regeneration of cGMP following its hydrolysis by phosphodiesterase. Mutations in different parts of this signalling cascade lead to retinal degeneration in humans.

The human cardiac troponin I locus: assignment to chromosome 19p13.2-19q13.2.

The three major troponin I isoforms are encoded by separate genes and are expressed in a muscle-type-specific manner. A human cardiac troponin I cDNA has recently been isolated and used to establish the genomic location of the cardiac troponin I gene locus (designated TNNC1). By somatic cell hybrid analysis, the locus for TNNC1 maps to human chromosome 19 and can be localised to the region p13.

Molecular cloning of human cardiac troponin I using polymerase chain reaction.

We have used the polymerase chain reaction (PCR) to synthesise a cDNA encoding part of human cardiac troponin I. Amplification was achieved using fully degenerate sets of oligonucleotides corresponding to conserved regions of amino acid sequence identified in other troponin I isoforms. The cloned PCR fragment was subsequently used to isolate full-length cDNAs from a cardiac cDNA library.

Cloning of a DNA fragment from Streptomyces griseus which directs streptomycin phosphotransferase activity.

DNA from Streptomyces griseus ATCC 12475 was partially digested with Sau3A and fragments were ligated into BglII-cleaved pIJ702. When the ligation mixture was used to transform protoplasts of Streptomyces lividans TK54, two transformants resistant to both thiostrepton and streptomycin were isolated. The hybrid plasmids pBV3 and pBV4 which they contained, carrying inserts of sizes 4.