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Primary structures of cysteine-containing peptides from the calcium ion-transporting adenosine triphosphatase of rabbit sarcoplasmic reticulum.

ABSTRACT: A preliminary investigation of the primary structure of the Ca(2+-transporting ATPase (adenosine triphosphatase) protein of rabbit skeletal-muscle sarcoplasmic reticulum is reported. The preparation of derivatives of delipidated protein in a form suitable for sequence analysis is described. Tryptic peptides containing S-carboxymethylcysteine residues were isolated from the reduced carboxymethylated protein, and their sequences were partially determined. The results are consistent with mol.wt. about 105000 for the polypeptide, and the absence of extended repeated lengths of sequence. The distribution of tryptophan and cysteine residues between large, aggregated peptides and soluble tryptic peptides shows that these residues are concentrated in different regions of the primary structure. This observation agrees with other evidence that these residues are, on the whole, widely separated in the native protein. The details of the procedures used to isolate the peptides, and the evidence for the determination of their sequences, are given Supplementary Publication SUP 50085 (30 pages), which has been deposited at the British Library Lending Division, Boston Spa, Wetherby, West Yorkshire LS23 7BQ, U.K., from whom copies can be obtained on the terms indicated in Biochem.J. (1978) 169, 5.

SUBMITTER: Allen G

PROVIDER: S-EPMC1185791 | biostudies-other | 1978 Aug

REPOSITORIES: biostudies-other

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Primary structure of the calcium ion-transporting adenosine triphosphatase from rabbit skeletal sarcoplasmic reticulum. Some peptic, thermolytic, tryptic and staphylococcal-proteinase peptides.

Project description:The soluble peptides from the peptic digest of the reduced S-carboxymethylated 3-carboxypropionylated adenosine triphosphatase protein have been isolated and most of their structures have been determined. About 397 residues of the protein were represented in these peptides. The reduced S-carboxymethylated protein was digested with thermolysin, and peptides containing arginine or carboxymethylcysteine were isolated and characterized. Some peptides isolated from tryptic and staphylococcal-proteinase digests of the protein are described. The information contained within the structures of these peptides has been used to reconstruct long stretches of the sequence of the ATPase protein that constitute most of the protein structure external to the lipid bilayer (Allen, Trinnaman and Green (1980) Biochem. J. 187, 591-616). The details of some of the chromatographic steps used in the isolation of the peptides and the properties of the peptides are contained in Supplementary Publication SUP 50104 (45 pages), which has been deposited with the British Library Lending Division, Boston Spa, Wetherby, West Yorkshire LS23 7BQ, U.K., from whom copies can be obtained on the terms indicated in Biochem. J. (1978) 169, 5.

| S-EPMC1162442 | biostudies-other

Primary structure of the calcium ion-transporting adenosine triphosphatase of rabbit skeletal sarcoplasmic reticulum. Soluble peptides from the alpha-chymotryptic digest of the carboxymethylated protein.

Project description:The isolation of the soluble peptides from the chymotryptic digest of the calcium-transporting ATPase of rabbit skeletal sarcoplasmic reticulum is described. These peptides were partially sequenced and the information obtained was used to align tryptic peptides of the protein and to confirm sequences within the tryptic peptides. Details of the isolation of some peptides and the amino acid analyses of the peptides are given in Supplementary Publication SUP 50103 (10 pages), which has been deposited with the British Library Lending Division, Boston Spa, Wetherby, West Yorkshire LS23 7BQ, U.K., from whom copies can be obtained on the terms indicated in Biochem. J. (1978) 169, 5.

| S-EPMC1162441 | biostudies-other

The adenosine triphosphatase and calcium ion-transporting activities of the sarcoplasmic reticulum of developing musce.

Project description:1. The ATPase (adenosine triphosphatase) specific activity and the total nitrogen content of the myofibrillar fraction per g. wet weight of rabbit longissimus dorsi muscle increased steadily during the late foetal stages and the first few weeks after birth. 2. The ATPase specific activity of the sarcoplasmic-reticular fraction isolated by a sucrose-density-gradient procedure rose to a sharp peak 8-10 days after birth and then declined to the adult value, which was about 25% of the maximum. 3. The peak in ATPase activity was a feature of the sarcoplasmic reticulum isolated from muscle, and the time at which it occurred in relation to birth was related to the degree of development and the activity pattern of the muscle. 4. The peak in ATPase activity of the sarcoplasmic reticulum occurred at an earlier age if newborn animals were made to exercise earlier than was normal. 5. The ;extra' ATPase associated with the sarcoplasmic reticulum and the ability to concentrate Ca(2+) increased in a similar manner over the period of development studied. 6. It is postulated that the Ca(2+)-transport system of the sarcoplasmic reticulum consists of two components, namely the ATPase and the system coupling this enzyme to Ca(2+) transport. During development the ATPase develops first and has almost reached maximum activity in the longissimus dorsi muscle of the rabbit after 8-10 days. Subsequently the activity of the coupling system rises rapidly, leading to an increase in the capacity and efficiency of Ca(2+) transport.

| S-EPMC1184840 | biostudies-other

The primary structure of the calcium-transporting adenosine triphosphatase of rabbit skeletal sarcoplasmic reticulum. Soluble tryptic peptides from the succinylated carboxymethylated protein.

Project description:The isolation and the determination of the amino-acid sequences of the soluble tryptic peptides, derived by cleavage at arginine residues, of the succinylated (3-carboxypropionylated) S-carboxymethylated adenosine triphosphatase protein of rabbit skeletal sarcoplasmic reticulum are described. Treatment of the protein with succinic anhydride gave a derivative that was readily digested with trypsin, yielding two distinct sets of peptides. One set comprises large, relatively hydrophobic, peptides that are highly aggregated (or insoluble) in aqueous solution and that have been identified, by several criteria, with the portion of the protein embedded in the lipid bilayer in the sarcoplasmic reticulum. The second set, which is described here, comprises peptides that have properties typical of those derived from soluble globular proteins and that constitute that part of the protein external to the lipid bilayer. The sequences of these soluble tryptic peptides contain 586 unique residues. Details of the isolation of the peptides and the determination of the sequences are contained in Supplementary Publication SUP 50102 (88 pages) which has been deposited with the British Library Lending Division, Boston Spa, Wetherby, West Yorkshire LS23 7BQ, U.K., from whom copies can be obtained on the terms indicated in Biochem. J. (1978) 169, 5.

| S-EPMC1162440 | biostudies-other

Polymorphism of sarcoplasmic-reticulum adenosine triphosphatase of rabbit skeletal muscle.

Project description:Antibody was raised in chickens against purified sarcoplasmic-reticulum Ca2+-activated ATPase (Ca2+-ATPase). The immunological relationship between the Ca2+-ATPase of fast-muscle and slow-muscle sarcoplasmic reticulum was investigated by a one-step and a two-step competitive enzyme-linked immunosorbent assay (ELISA). The results show marked antigenic differences between the membrane-bound Ca2+-ATPase of the sarcoplasmic-reticulum vesicles from fast muscle and slow muscle, beside differences in the membrane content of ATPase protein.

| S-EPMC1163077 | biostudies-other

The primary structure of the calcium ion-transporting adenosine triphosphatase protein of rabbit skeletal sarcoplasmic reticulum. Peptides derived from digestion with cyanogen bromide, and the sequences of three long extramembranous segments.

Project description:The isolation and characterization of the soluble peptides from the CNBr digest of the calcium ion-transporting adenosine triphosphatase protein of rabbit skeletal sarcoplasmic reticulum are described. The 562 unique residues of the protein were placed in sequences. The remaining part of the protein (about 500 residues) yielded long hydrophobic sequences that contained all but one of the tryptophan residues of the protein and that were probably derived largely from the intramembranous parts of the protein. Three long stretches of primary structure, constituting half of the protein, have been reconstructed from the information presented here together with the sequences found in peptides from other digests of the protein. The secondary structures of these sequences have been predicted. A model for the primary structure of the protein is presented and the implications discussed. Details of the isolation of peptides are contained in Supplementary Publication, SUP 50105 (29 pages), which has been deposited with the British Library Lending Division, Boston Spa, Wetherby, West Yorkshire LS23 7BQ, U.K., from whom copies can be obtained on the terms indicated in Biochem. J. (1978) 169, 5.

| S-EPMC1162443 | biostudies-other

The binding of nucleotides and bivalent cations to the calcium-and-magnesium ion-dependent adenosine triphosphatase from rabbit muscle sarcoplasmic reticulum.

Project description:The binding of MgATP to purified Ca2+Mg2+-dependent adenosine triphosphatase from rabbit muscle sarcoplasmic reticulum was studied by using a flow-dialysis method. Phosphoryl-enzyme formation and catalytic activity were also measured, and all three processes demonstrated negative co-operativity, with half-saturation of all three parameters at a MgATP concentration of 40-50muM, and a Hill coefficient (h) of 0.8. The variation of the binding constant with with pH was measured and showed tighter binding of MgATP with increasing pH over the range 6.8-8.5. Binding parameters for ATP analogues were also measured. The binding of Ca2+ in the presence and absence of ATP analogues gave half saturation at a Ca2+ concentration of 1.2-1.3muM. Hill plots of Ca2+-binding data gave a slope of 0.8. These results show that the binding of MgATP and Ca2+ can occur in a random manner, with neither substrate influencing the affinity of the enzyme for the other.

| S-EPMC1164174 | biostudies-other

Cross-linking experiments with the adenosine triphosphatase of sarcoplasmic reticulum.

Project description:The proteins of sarcoplasmic reticulum were cross-linked by rapid oxidation of thiol groups with I2. About two-thirds of the thiols were oxidized without any significant cross-linking, implying an extensive formation of intramolecular disulphide bonds. When the thiols were completely oxidized at room temperature a series of oligomers containing up to five molecules were observed, as well as large aggregates which were excluded from the gels. Complete oxidation at -10 degrees C left most of the ATPase (adenosine triphosphatase) as monomer. Similar results were obtained when copper-phenanthroline complexes or dimethyl suberimidate were used as cross-linking reagents. We conclude that most of the cross-linked species arise by linking of randomly colliding ATPase molecules which are present in the membrane at very high concentration.

| S-EPMC1186603 | biostudies-other

The sequence of two peptides isolated from the Ca2+-transporting ATPase of rabbit sarcoplasmic reticulum after cleavage at tryptophan.

Project description:Cleavage of reduced, carboxymethylated, delipidated CA2+-transporting ATPase protein from rabbit sarcoplasmic reticulum with dimethyl sulphoxide/HBr yielded two long peptides (38 and 73 residues), distinct from the known major sequences of the ATPase. The longer peptide contained at least two cysteine residues, which were disulphide-linked in the native protein. It was therefore derived from the B-fragment of the ATPase in which the disulphides had previously been located. It probably formed a loop on the luminal side of the membrane, spanning two membrane-buried tryptophan residues. The N-terminal sequence of this peptide, (Trp)-Phe-Met-Tyr-Ala, forms the basis for an oligodeoxynucleotide probe, the use of which to identify cDNA corresponding to the ATPase is described elsewhere [MacLennan, Brandl, Korczak & Green (1985) Nature (London) 316, 696-700].

| S-EPMC1152763 | biostudies-other

Synonymous mutation in adenosine triphosphatase copper-transporting beta causes enhanced exon skipping in Wilson disease.

Project description:Wilson disease (WD) is caused by biallelic pathogenic variants in adenosine triphosphatase copper-transporting beta (ATP7B); however, genetic testing identifies only one or no pathogenic ATP7B variant in a number of patients with WD. Synonymous single-nucleotide sequence variants have been recognized as pathogenic in individual families. The aim of the present study was to evaluate the prevalence and disease mechanism of the synonymous variant c.2292C>T (p.Phe764=) in WD. A cohort of 280 patients with WD heterozygous for a single ATP7B variant was investigated for the presence of c.2292C>T (p.Phe764=). In this cohort of otherwise genetically unexplained WD, the allele frequency of c.2292C>T (p.Phe764=) was 2.5% (14 of 560) compared to 7.1 × 10-6 in the general population (2 of 280,964 in the Genome Aggregation Database; p < 10-5 ; Fisher exact test). In an independent United Kingdom (UK) cohort, 2 patients with WD homozygous for p.Phe764= were identified. RNA analysis of ATP7B transcripts from patients homozygous or heterozygous for c.2292C>T and control fibroblasts showed that this variant caused high expression of an ATP7B transcript variant lacking exon 8. Conclusion: The synonymous ATP7B variant c.2292C>T (p.Phe764=) causes abnormal messenger RNA processing of ATP7B transcripts and is associated with WD in compound heterozygotes and homozygotes.

| S-EPMC9234614 | biostudies-literature

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