Question

ribonuclease definition and structure

Answer 1

Answer:

Widely distributed type of enzyme that cleaves rNA. May act as endonucleases or exonucleases depending upon the type of enzyme. Generally recognise target by tertiary structure rather than sequence. ... Ribonuclease TIII cleaves double stranded regions of RNA molecules

Ribonuclease consists of a single, cross-linked chain (1) containing ap- proximately 124 amino acid residues (2, 3). The N-terminal sequence of this chain, together with certain deductions concerning its gross structure, has been presented earlier (1

Ribonuclease (commonly abbreviated RNase) is a type of nuclease that catalyzes the degradation of RNA into smaller components.

Explanation:

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Answer 2

• Definition: RNase P is an endo-nuclease composed of one RNA molecule and one protein molecule. It is therefore a very simple RNP.

• Structure: In E. coli, RNase P is composed of a 377 nt RNA and a small basic protein of 13.7 kDa. The secondary structure of the RNA has been highly conserved during evolution.