摘要:
A polypeptide cleavage method characterized in that arginine or lysine is at the P1 position of a desired cleavage site in a polypeptide, an amino acid other than aspartic acid, glutamic acid or proline is at the P1′ position, a single basic amino acid or two or three consecutive basic amino acids are situated at any site in the amino acid sequence from the P10 position to the P3 position or from the P3′ position to the P5′ position (with the proviso that a single basic amino acid is not situated at the P6 or P4 position), and OmpT protease or its variant enzyme having a substitution at the 97th amino acid from the N-terminus is used to cleave the desired cleavage site in the polypeptide.
摘要:
The present invention relates to compounds comprising modified corticotrophin releasing factor peptide and specifically urocortin and urocortin-related peptides, modified derivatives thereof, and conjugates of such modified peptides and derivatives to serum components, preferably serum proteins or peptides. The compounds and conjugates of the invention comprise a reactive group, which is covalently attached to a modified peptide or derivative, optionally through a linking group. The present invention also provides methods for the covalent attachment of a modified peptide or derivative to a serum protein or peptide to form a conjugate of the invention. The conjugates of the invention preferably exhibit a longer in vivo circulating half-life compared to the corresponding unconjugated peptides. The conjugates of the invention also retain at least some of the biological activity of the unconjugated peptides, and preferably exhibit increased biological activity compared to the unconjugated peptides. The present invention also provides methods for the treatment and prevention of a disease or disorder comprising the administration of one or more of the compounds or conjugates of the invention to a subject in need of such treatment or prevention.
摘要:
A human urocortin-related peptide with significant sequence homology to the CRF neuropeptide family was identified. A mouse cDNA was isolated from whole brain poly (A+) RNA that encodes a predicted 38 amino acid peptide protein designated herein as urocortin II. Both human URP and mouse Ucn II are structurally related to the other known mammalian family members, CRF and urocortin (Ucn). These peptides are involved in the regulation of the hypothalamic-pituitary-adrenal axis under basal and stress conditions, suggesting a similar role for URP and Ucn II. Synthesized Ucn-II and URP peptide binds with higher affinity to CRF-R2 than to CRF-R1 Ucn II and human URP appear to be involved in the regulation of body temperature and appetite and may play a role in other stress related phenomenon. These findings identify Ucn II and human URP as a new members of the CRF family of neuropeptides, which are expressed centrally and bind to CRF-R2.
摘要:
This invention relates to peptide analogs of corticotropin-releasing hormone. Particularly, the invention provides methods for treating proliferative disorders by administering peptide analogs wherein the 38th amino acid from the N-terminus is D-Nle, i.e. [D-Nle38]-CRH peptide.
摘要:
The present invention relates to novel peptides that are potent cytokine regulatory agents. In addition, the present invention relates to pharmaceutical compositions comprising a pharmaceutically acceptable carrier and a cytokine regulatory agent. Administration of such a cytokine regulatory agent to a subject can enhance or restrain cytokine activity. Thus, the present invention provides a method of regulating cytokine activity in a subject having a condition characterized by aberrant or altered cytokine activity. The invention also provides methods of treating such conditions, including, for example, disuse deconditioning, diseases mediated by nitric oxide and cytokines, adverse drug reactions, obesity, septic shock, and adverse side effects due to cancer chemotherapy or occurring as in response to organ transplantation.
摘要:
Improved CRF antagonist peptides have the formula: ##STR1## wherein R.sub.30 is Cys or Glu; R.sub.33 is Cys, Lys or Orn; provided that when R.sub.30 is Cys, R.sub.33 is Cys and when R.sub.30 is Glu, R.sub.33 is Lys or Orn. The N-terminus may be extended by Asp-Leu-Thr. Lys may be substituted for Arg.sup.23 and its side chain connected by a lactam bridge to Glu.sup.20 to form a dicyclic peptide. Specific CRF antagonists disclosed include (cyclo 30-33) [D-Phe.sup.12, Nle.sup.21,38, Glu.sup.30, Lys.sup.33 ]rCRF(12-41); (cyclo 30-33) [D-Phe.sup.12, Nle.sup.21,38, Glu.sup.30, Orn.sup.33 ]rCRF(12-41), (cyclo 30-33) [D-Phe.sup.12, Nle.sup.21,38, Cys.sup.30,33 ]rCRF (12-41) and (bicyclo 20-23,30-33) [D-Phe.sup.12, Nle.sup.21,38, Lys.sup.23,33, Glu.sup.30 ]-rCRF(12-41).
摘要:
Isolated, substantially pure mammalian brain-derived membrane-associated CRF-binding proteins and biologically active fragments thereof are provided as well as isolated and purified DNA fragments which encode the CRF binding proteins or biologically active fragments thereof or homologs of other mammalian species. By administering an amount of such CRF binding protein or a fragment thereof effective to modulate receptor activation, it is possible to modulate the action of CRF upon (a) the brain and nervous system, (b) the pituitary particularly for production of ACTH, beta endorphin and cortisol, (c) sites of inflammation, (d) the placenta, (e) the adrenal glands, (f) the gonads or (g) the gastrointestinal tract. Administration of an N-terminal fragment of the protein increases the binding site density for CRF and thus modulates its biological effect in vivo.
摘要:
The parenteral administration of 80-160 .mu.g per kg body weight of substituted or unsubstituted fragments of ACTH (1-39) having formula ACTH (X-Y) wherein X is an integer from 1 to 5 and Y is an integer from 10 to 39 (provided that, when X is 1, Y is not 24) restores the normal blood pressure and respiratory frequence in a patient in serious shock conditions, particularly in hypovolemic shock.
摘要:
Method for preparing peptides free of undesired amino acids or amino acid sequences employing site specific receptors and proteases to cleave unprotected enzymatically hydrolyzable bonds.
摘要:
The present invention relates to the use of the peptides of the general formula:A--B--L--Phe (or L--Ala)--D--Lys--L--Phe--Z--OH, IwhereA represents one of the following groups: H--L--Met, H--L--Met(O), H--L--Met(O.sub.2), desamino-Met, desamino-Met(O) or desamino-Met(O.sub.2),B represents one of the following di-peptide fragments: Glu--His or Ala--Ala, where one amino acid residue of this di-peptide fragment can occur in the D form, andZ is either absent, or represents the amino acid residue Gly, or is the peptide fragment (10-16)--ACTH, where the amino acid L--Lys may be replaced, if desired, by D--Lys at position 11 of the (10-16)--ACTH fragment,and the functional derivatives thereof in promoting axonal regeneration.