Exhibit 31.1



CERTIFICATION



I, Robert G. Johnson, Jr., M.D., Ph.D., Chief Executive Officer of Kosan Biosciences Incorporated, certify that:



1. I have reviewed this annual report on Form 10-K of Kosan Biosciences Incorporated;



2. Based on my knowledge, this report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;



3. Based on my knowledge, the financial statements, and other financial information
included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;



4. The registrants other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant
and have:



a) designed such disclosure controls and
procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being prepared;



b) designed such internal control over financial reporting or caused such internal control over financial reporting to be designed under our
supervision to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;



c) evaluated the effectiveness of the registrants disclosure
controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and



d) disclosed in this report any change in the registrants
internal control over financial reporting that occurred during registrants most recent fiscal quarter (the registrants fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to
materially affect, the registrants internal control over financial reporting; and



5. The registrants other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrants auditors and the audit committee of
registrants board of directors (or persons performing the equivalent functions):



a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably
likely to adversely affect the registrants ability to record, process, summarize and report financial information; and



b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal
control over financial reporting.





|                      |  |     |  |                                        
|--------------------- |  | --- |  | ---------------------------------------
|Dated: March 16, 2006 |  | By: |  | /s/ Robert G. Johnson, Jr., M.D., Ph.D.
|                      |  |     |  | Robert G. Johnson, Jr., M.D., Ph.D.    
|                      |  |     |  | Chief Executive Officer