摘要:
Analogs of CCK(1-8) having dissociated activity with respect to stimulating the contraction of the gall bladder and arresting the secretion of gastric acid. Various analogs also exhibit improved anticonvulsive potency. The peptides are characterized by the following formula:X--R.sub.0 --R.sub.1 --Tyr(Y)--R.sub.3 --R.sub.4 --Trp--R.sub.6 --R.sub.7 --R.sub.8 --NHQwherein X is H, Suc, Ac, Oxa, Mal, Glt, Prp, Prl or Acr; R.sub.0 is Gln, pGlu, Cys, Tyr, Tyr(OCH.sub.3), des--NH.sub.2 --Tyr or desR.sub.0 ; R.sub.1 is Asp, Tyr(OH or SE), Ser(OH or SE), Hyp(OH or SE), Thr(OH or SE), Cys, Tyr(OCH.sub.3) or desR.sub.1 ; Y is OH or SE; R.sub.3 is Met, Nva or Nle; R.sub.4 is Gly, D--Cys or D--Ala; R.sub.6 is Met, Nva or Nle; R.sub.7 is Asp, Ser(SE), Thr(SE) or Hyp(SE); R.sub.8 is Phe or Tyr(OCH.sub.3); and Q is lower alkyl, fluoro lower alkyl or hydrogen; provided that when R.sub.3 and R.sub.6 are Met and R.sub.7 is Asp then R.sub.4 is D--Ala. A pharmaceutically acceptable salt thereof may also be employed.
摘要:
Peptides containing a disulfide bond between two cysteine residues are formed by an oxidation process. The oxidation step is accomplished under conditions whereby the sulfhydryl concentration in a reaction mixture is maintained at substantially zero during the reaction. In the process, an aqueous solution of a peptide containing at least one pair of cysteine moities is added incrementally to a buffered solution containing an oxidizing agent. The period between addition of the increments of the peptide solution is sufficient that the reaction to form the disulfide bond occurs substantially instantaneously. The increments are of such size that the sulfhydryl concentration during the reaction remains substantially constant and at a level of substantially zero, equivalent to infinite dilution.
摘要:
CRF peptide analogs that bind to CRFR2 with an affinity far greater than they bind to CRFR1. These analogs exhibit CRF antagonist activity, and they can be based upon the native structures of sauvagine, CRF, and urocortin.
摘要:
Novel cyclic CRF agonist peptides have the amino acid sequence: (cyclo 30-33)Ac-Ser-Leu-Asp-Leu-Thr-D-Phe-His-Leu-Leu-Arg-Glu-Val-Leu-Glu-Nle-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Glu-Ala-R32-R33-Asn-Arg-Lys-Leu-Nle-Glu-Ile-Ile-NH2 wherein R32 is His, D-His or an equivalent &agr;-amino acid; R33 is Lys or Orn. The N-terminus may be extended by Tyr, D-Tyr or Ile. Lys may be substituted for Arg23, and its side chain connected by a lactam bridge to Glu20 to form a bicyclic peptide. Certain disclosed CRF agonists include: (cyclo 30-33)[Ac-Ser7, D-Phe12, Nle21,38, Glu30, Lys33]r/hCRF(7-41); (cyclo 30-33)[Ac-Ser7, D-Phe12, Nle21,38, Glu30, D-His32, Lys33]r/hCRF(7-41); (bicyclo 20-23, 30-33)[Ac-Ser7, D-Phe12, Nle21,38, Lys23,33, Glu30, D-His32]-r/hCRF(7-41); (cyclo 30-33)[Ac-Ser7, D-Phe12, Nle18,21, Glu30, D-Ala32, Lys33]&agr;-helicale CRF(7-41); and (cyclo 30-33)[Ac-Ser7, D-Phe12, Nle21,38, CML27,40, Glu30, Lys33]r/hCRF(7-41). Labelled agonist such as (cyclo 30-33)[Ac-I125Tyr6, D-Phe12, Nle21,38, Glu30, Lys33]r/hCRF(6-41) and (cyclo 30-33)[Ac-I125D-Tyr6, D-Phe12, Nle21,38, Glu30, D-His32, Lys33]r/hCRF(6-41) are useful in screening for more potent CRF agonists.
摘要翻译:新型循环CRF激动剂肽具有氨基酸序列:(环30-33)Ac-Ser-Leu-Asp-Leu-Thr-D-Phe-His-Leu-Leu-Arg-Glu-Val-Leu-Glu-Nle -Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Glu-Ala-R32-R33-Asn-Arg-Lys-Leu-Nle-Glu-Ile-Ile-NH2,其中R32是His,D-His 或等效的α-氨基酸; R33是Lys或Orn。 N末端可以被Tyr,D-Tyr或Ile延伸。 Lys可以代替Arg23,其侧链通过内酰胺桥连接至Glu20以形成双环肽。 某些公开的CRF激动剂包括:(环30-33)[Ac-Ser7,D-Phe12,Nle21,38,Glu30,Lys33] r / hCRF(7-41); (环30-33)[Ac-Ser7,D-Phe12,Nle21,38,Glu30,D-His32,Lys33] r / hCRF(7-41); (双环20-23,30-33)[Ac-Ser7,D-Phe12,Nle21,38,Lys23,33,Glu30,D-His32] -r / hCRF(7-41); (环30-33)[Ac-Ser7,D-Phe12,Nle18,21,Glu30,D-Ala32,Lys33]α-螺旋CRF(7-41); 和(环30-33)[Ac-Ser7,D-Phe12,Nle21,38,CML27,40,Glu30,Lys33] r / hCRF(7-41)。 标记的激动剂如(环30-33)[Ac-I125Tyr6,D-Phe12,Nle21,38,Glu30,Lys33] r / hCRF(6-41)和(环30-33)[Ac-I125D-Tyr6,D -Phe12,Nle21,38,Glu30,D-His32,Lys33] r / hCRF(6-41)可用于筛选更有效的CRF激动剂。
摘要:
Novel cyclic CRF antagonist peptides are created by shortening the N-terminus of a CRF family peptide by 8 residues and adding an acyl group. CML is present in what would be the 27-position of the native CRF sequence, and a cyclizing bond is created between the side chains of the residues in positions 30 and 33. The side chain of Lys, preferably, in position 33 is linked to the side chain of Glu in position 30 by a lactam bridce. Disclosed CRF antagonists include: (cyclo 30-33)[Ac-Asp9, D-Phe12, Nle21,38, CML27,40, Glu30, Lys33]r/hCRF(9-4); (cyclo 30-33)[Ac-Asp9, D-Phe12, CML18,27, Nle21,38, Glu30, Lys33]r-hCRF(9-41); (cyclo 30-33)[Ac-Asp9, D-Phe12, Nle21,38, CML27,37, Glu30, Lys33]r/hCRF(9-41); (cyclo 30-33)[Ac-Asp9, D-Phe12, CML14,27, Nle21,38, Glu30, Lys33]r/hCRF(9-41); (cyclo 30-33)[Ac-Asp9, D-Phe12, Nle21,38, CML27, Glu30, Lys33]r/hCRF(9-41); and (cyclo 30-33)[Ac-Asp9, D-Phe12, Nle21,38, CML27,40, Glu30, Aib32, Lys33]r/hCRF(9-41).
摘要翻译:通过将CRF家族肽的N末端缩短8个残基并加入酰基来产生新的循环CRF拮抗剂肽。 CML存在于天然CRF序列的27位上,并且在位置30和33的残基的侧链之间产生环化键。Lys的侧链优选位于33位与 位置30处的Glu的侧链通过内酰胺桥接。 公开的CRF拮抗剂包括:(环30-33)[Ac-Asp9,D-Phe12,Nle21,38,CML27,40,Glu30,Lys33] r / hCRF(9-4); (环30-33)[Ac-Asp9,D-Phe12,CML18,27,Nle21,38,Glu30,Lys33] r-hCRF(9-41); (环30-33)[Ac-Asp9,D-Phe12,Nle21,38,CML27,37,Glu30,Lys33] r / hCRF(9-41); (环30-33)[Ac-Asp9,D-Phe12,CML14,27,Nle21,38,Glu30,Lys33] r / hCRF(9-41); (环30-33)[Ac-Asp9,D-Phe12,Nle21,38,CML27,Glu30,Lys33] r / hCRF(9-41); 和(环30-33)[Ac-Asp9,D-Phe12,Nle21,38,CML27,40,Glu30,Aib32,Lys33] r / hCRF(9-41)。
摘要:
Compounds termed "betides" mimic peptides and contain one or more residues of aminoglycine, C.sup..alpha. -aminoalanine, aminosarcosine or the like wherein the side chain amino group has been acylated and optionally also alkylated. Generally, betides have the formula: X.sub.N -X.sub.1 -X.sub.2 -X.sub.3 -X.sub.m -X.sub.4 -X.sub.5 -X.sub.6 -X.sub.C, where X.sub.N is an acyl or other N-terminal group or a peptide up to about 50 amino acids in length having such a group; X.sub.C is OH, NH.sub.2 or other C-terminal group or a peptide up to about 50 amino acids in length having such a group; and X.sub.1 -X.sub.6 are each independently a betidamino acid or .alpha.-amino acid or des-X; and X.sub.m is a peptide up to about 50 amino acids or des-X; provided however that at least one of X.sub.1 -X.sub.6 is a betidamino acid residue having the formula: ##STR1## wherein R.sub.0 is H or CH.sub.3, R and R.sub.2 are H or lower alkyl, and R.sub.3 is an acyl group, an isocyanate or isothiocyanate group, a sulfonyl group or the like. To make a betide, an aminoglycine residue is subjected to side chain acylation, and optionally also alkylation, after it is coupled into a peptide intermediate. By synthesizing betides with multiple substituents at one or more positions in an otherwise peptidic chain, efficient screening of betides which mimic peptides having a large number of different natural or unnatural amino acid substituents at a particular position, and optionally both D- and L-isomers thereof, is possible.
摘要:
Novel cyclic CRF antagonist peptides are created by shortening the N-terminus of a CRF family peptide by 8-11 residues and adding an acyl group. CML is preferably present in what would be the 27-position of the native CRF sequence, and D-Tyr may be incorporated at the N-terminus to facilitate labelling. The cyclizing bond is preferably created between the side chains of the residues in positions 30 and 33; but it may alternatively be created between the residues in either of positions 28 and 29 with those in positions 31 and 32 or with those in positions 32 and 33, respectively. The side chain of Lys in position 33 is preferably linked to the side chain of Glu in position 30 by a lactam bridge to form the cyclic peptide. Disclosed CRF antagonists include: (cyclo 30-33) �Ac-Asp.sup.9, D-Phe.sup.12, Nle.sup.21,38, CML.sup.27,40, Glu.sup.30, Lys.sup.33 !r/hCRF(9-41), (cyclo 30-33) �Ac-Asp.sup.9, D-Phe.sup.12, Nle.sup.21,38, CML.sup.27,37, Glu.sup.30, Lys.sup.33 !r/hCRF(9-41), (cyclo 30-33) �Ac-Asp.sup.9, D-Phe.sup.12, CML.sup.14,27, Nle.sup.21,38, Glu.sup.30, Lys.sup.33 !r/hCRF(9-41), (cyclo 30-33) �Ac-Asp.sup.9, D-Phe.sup.12, Nle.sup.21,38, CML.sup.27, Glu.sup.30, Lys.sup.33 !r/hCRF(9-41), (cyclo 30-33) �Ac-Asp.sup.9, D-Phe.sup.12, CML.sup.18,27, Nle.sup.21,38, Glu.sup.30, D-His.sup.32, Lys.sup.33 !r/hCRF(9-41) and (cyclo 30-33) �Ac-Asp.sup.9, D-Phe.sup.12, CML.sup.18,27, Nle.sup.21,38, Glu.sup.30, Lys.sup.33 !r/hCRF(9-41).
摘要翻译:通过将CRF家族肽的N末端缩短8-11个残基并加入酰基来产生新的循环CRF拮抗剂肽。 CML优选存在于天然CRF序列的27位上,并且D-Tyr可以并入N末端以促进标记。 优选在位置30和33之间的残基的侧链之间产生环化键; 但也可以分别在位置28和29之间的残基与位置31和32中的残基之间或位于第32和33位的残基之间产生。 位置33处的Lys侧链优选通过内酰胺桥连接于位置30的Glu侧链以形成环肽。 公开的CRF拮抗剂包括:(环30-33)[Ac-Asp9,D-Phe12,Nle21,38,CML27,40,Glu30,Lys33] r / hCRF(9-41),(环30-33)[Ac- Asp9,D-Phe12,Nle21,38,CML27,37,Glu30,Lys33] r / hCRF(9-41),(环30-33)[Ac-Asp9,D-Phe12,CML14,27,Nle21,38, Glu30,Lys33] r / hCRF(9-41),(环30-33)[Ac-Asp9,D-Phe12,Nle21,38,CML27,Glu30,Lys33] r / hCRF(9-41),(环30 -33)[Ac-Asp9,D-Phe12,CML18,27,Nle21,38,Glu30,D-His32,Lys33] r / hCRF(9-41)和(环30-33)[Ac-Asp9, Phe12,CML18,27,Nle21,38,Glu30,Lys33] r / hCRF(9-41)。
摘要:
Peptides which have substantial bioactivity to inhibit the secretion of gonadotropins by the pituitary gland and to inhibit the release of steroids by the gonads. Administration of an effective amount of such GnRH antagonists prevents ovulation and/or the release of steroids by the gonads. They may also be used to treat steroid-dependent tumors, such as prostatic and mammary tumors. The peptides are bicyclic analogs of the decapeptide GnRH having two covalent bonds, between the residues in the 4- and 10-positions and the residues in the 5- and 8-positions. The latter linkage includes peptide bonds between a residue of an .alpha.-amino acid outside of the main chain and a side-chain carboxyl group of the 5-position residue and a side-chain amino group of the 8-position residue.
摘要:
Methods for making peptides of a suitable length for solid phase synthesis, which peptides include in their sequence a pair of residues of a different character which have acylated side chains and a residue which has an N-alkylated side chain. A peptide intermediate is constructed on the resin using commercially available starting materials. The N-terminus can be acylated by removing the .alpha.-amino protecting group and acylating under standard conditions. First primary amino protecting groups included in those residues to be acylated are removed, and acylation is effected, preferably by using a carboxypyridine or a similar heterocyclic acylating agent. Following such side chain acylation, a second protecting group included in the residue to be N-alkylated is removed, and the N-alkylation reaction is carried out while the peptide remains on the resin using a borohydride and an appropriate aldehyde or ketone. Following cleavage from the resin and removal of any protecting groups still remaining, the peptide is appropriately purified, thus requiring only a single purification to be carried out while forming a synthetic peptide including residues for which the modified amino acids are not readily commercially available.
摘要:
Peptide N-alkylamides, and other C-terminal N-substituted amides, can be synthesized using solid-phase synthesis on a benzene-containing resin which is suitably methylated. Reactive amino groups are attached directly or indirectly to the methyl groups, for example, such as by reacting commercially available chloromethylated polystyrene resins with an alkylamine to create a resin-amine. The C-terminal amino acid of the desired peptide is linked to the resin-amine via an amide linkage, and the peptide is thereafter built in normal fashion. Treatment of the completed peptide intermediate with HF is effective to both effect deprotection and cleave the peptide from the resin in the form of the N-substituted amide. Examples include peptide N-ethylamides, N-fluoroethylamide, N-anilides and other substituted N-benzylamides.