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Macrophage colony-stimulating factor purified from normal human urine. Amino-terminal sequence and amino acid
Abstract:
A macrophage colony-stimulating factor (M-CSF) was purified to homogeneity from a large amount of normal human urine. Microanalysis of the N-terminal amino acid sequence up to residue 44 revealed only a single residue difference from that deduced by other workers from the nucleotide sequence of M-CSF cDNA clones. The amino acid composition of the present preparation suggested that the M-CSF which we purified possessed a structure fitting the sequence 1-190 of TPA30-1 cell M-CSF deduced by Wong et al. [(1987) Science 235, 1504-1508].
Insights
Researchers purified macrophage colony-stimulating factor (M-CSF) from human urine, finding its N-terminal sequence closely matched previously deduced M-CSF structures. This study confirms the protein
Area of Science:
- Biochemistry
- Immunology
- Molecular Biology
Background:
- Macrophage colony-stimulating factor (M-CSF) is crucial for hematopoiesis and immune function.
- Previous studies deduced M-CSF structure from cDNA sequences, but direct protein analysis is valuable.
Purpose of the Study:
- To purify and characterize macrophage colony-stimulating factor (M-CSF) from normal human urine.
- To compare the purified M-CSF's N-terminal amino acid sequence with existing data.
Main Methods:
- Purification of M-CSF to homogeneity from large volumes of human urine.
- Microanalysis of the N-terminal amino acid sequence up to residue 44.
- Amino acid composition analysis.
Main Results:
- M-CSF was successfully purified to homogeneity from human urine.
- The N-terminal amino acid sequence showed only one difference compared to sequences deduced from cDNA.
- Amino acid composition supported a structure consistent with previously reported M-CSF.
Conclusions:
- The purified human urinary M-CSF is structurally similar to M-CSF derived from other sources.
- This provides direct biochemical evidence supporting the deduced M-CSF structure.