GH Chicken

GH Chicken Recombinant
Cat. No.
BT12279
Source
Escherichia Coli.
Synonyms

GH1, GH, GHN, GH-N, hGH-N,Pituitary GH, GH 1, 

Appearance
Sterile Filtered White lyophilized (freeze-dried) powder.
Purity
Greater than 99.0% as determined by:
(a) Analysis by SDS-PAGE gel.
(b) Analysis by SEC-HPLC.
Usage

THE BioTek's products are furnished for LABORATORY RESEARCH USE ONLY.They may not be used as drugs,agricultural or pesticidal products, food additives or household chemicals.

Shipped with Ice Packs
In Stock

Description

GH Chicken Recombinant produced in E.Coli is a single, non-glycosylated, polypeptide chain containing 191 amino acids with an additional Ala at its N-terminus and having a molecular mass of 22255 Dalton.
GH Chicken recombinant is purified by proprietary chromatographic techniques.

Product Specs

Introduction

Growth hormone (GH) is a member of the prolactin family of hormones and plays a crucial role in regulating growth. The GH gene, along with four related genes, forms the GH locus on chromosome 17. These genes share the same transcriptional orientation, suggesting their origin from gene duplication events. The five genes exhibit a high degree of sequence similarity. Alternative splicing further diversifies the GH isoforms, potentially leading to functional specialization. This specific family member is expressed in the pituitary gland but not in placental tissue, unlike the other four genes in the GH locus. Mutations or deletions in this gene result in GH deficiency, leading to short stature.

Description

Recombinant Chicken GH, produced in E. coli, is a single, non-glycosylated polypeptide chain consisting of 191 amino acids. It includes an additional Alanine residue at the N-terminus, resulting in a molecular weight of 22255 Daltons. Purification of recombinant Chicken GH is achieved using proprietary chromatographic techniques.

Physical Appearance
Sterile Filtered White lyophilized (freeze-dried) powder.
Formulation
The protein was lyophilized from a concentrated (1mg/ml) solution containing 0.3% NaHCO3, with the pH adjusted to 8.
Solubility
To reconstitute the lyophilized Chicken GH, it is recommended to dissolve it in sterile water or 0.4% NaHCO3 solution adjusted to a pH of 8-9. The initial reconstitution concentration should be between 100 µg/ml and 3 mg/ml. This solution can then be further diluted using other aqueous solutions, preferably in the presence of a carrier protein.
Stability
Lyophilized Chicken GH remains stable at room temperature for up to 3 weeks. However, for long-term storage, it is recommended to store the desiccated product below -18°C. After reconstitution at a concentration exceeding 0.1 mg/ml and filter sterilization, Chicken GH can be stored at 4°C for several weeks. For lower concentrations, adding a carrier protein like 0.1% HSA or BSA is advisable. It is essential to avoid repeated freeze-thaw cycles.
Purity
The purity is greater than 99.0%, as determined by:
(a) SDS-PAGE gel analysis.
(b) SEC-HPLC analysis.
Biological Activity
Recombinant Chicken GH demonstrates full biological activity in homologous assays and in PDF-P1 3B9 cells stably expressing rabbit GH receptors.
Protein Content

Protein quantification was performed using two independent methods:
1. UV spectroscopy at 280 nm, employing an absorbance value of 0.75 as the extinction coefficient for a 0.1% (1 mg/ml) solution at pH 8.0. This value is derived from the PC GENE computer analysis program of protein sequences (IntelliGenetics).
2. RP-HPLC analysis, utilizing a calibrated GH solution as a reference standard.

Synonyms

GH1, GH, GHN, GH-N, hGH-N,Pituitary GH, GH 1, 

Source
Escherichia Coli.
Amino Acid Sequence
The sequence of the first five N-terminal amino acids was determined and was found to be Ala-Thr-Phe-Pro-Ala.

Product Science Overview

Definition and Classification

Recombinant chicken GH (rcGH) is a synthetic form of the natural growth hormone produced in chickens. It is typically produced using recombinant DNA technology, where the GH gene is inserted into a bacterial or yeast expression system to produce the hormone in large quantities .

Biological Properties

The rcGH is a single, non-glycosylated polypeptide chain consisting of 191 amino acids with an additional alanine at its N-terminus. It has a molecular mass of approximately 22,255 Daltons . The recombinant hormone is biologically active and can mimic the effects of natural GH in homologous assays .

Expression Patterns and Tissue Distribution

In chickens, natural GH is primarily produced in the pituitary gland. Recombinant GH, however, is produced in bacterial systems such as Escherichia coli and then purified using chromatographic techniques .

Biological Functions

GH plays a vital role in regulating growth, body composition, and metabolism. In poultry, GH influences body weight, fat formation, and feed conversion efficiency . It also has significant effects on the immune system, contributing to the maintenance of immune functions .

Modes of Action

GH exerts its effects by binding to specific GH receptors on target cells. This binding activates various signaling pathways that promote growth and metabolic processes. In chickens, rcGH has been shown to increase plasma GH levels significantly and induce metabolic changes .

Regulatory Mechanisms

The production and release of GH are regulated by the hypothalamus and pituitary gland through a feedback loop involving growth hormone-releasing hormone (GHRH) and somatostatin. Recombinant GH, when administered exogenously, can bypass these regulatory mechanisms and directly influence growth and metabolism .

Applications and Research

Recombinant chicken GH has been studied for its potential to enhance growth and feed efficiency in broiler chickens. However, studies have shown that while rcGH can induce significant metabolic effects, it may not necessarily lead to increased growth in highly selected poultry breeds . Nonetheless, rcGH remains a valuable tool for research in endocrinology and poultry science.

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